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729 lines
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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/anyhow-1.0.102/src/lib.rs`."><title>lib.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="anyhow" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">anyhow/</div>lib.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! [![github]](https://github.com/dtolnay/anyhow)&ensp;[![crates-io]](https://crates.io/crates/anyhow)&ensp;[![docs-rs]](https://docs.rs/anyhow)
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<a href=#2 id=2 data-nosnippet>2</a>//!
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<a href=#3 id=3 data-nosnippet>3</a>//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github
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<a href=#4 id=4 data-nosnippet>4</a>//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust
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<a href=#5 id=5 data-nosnippet>5</a>//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs
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<a href=#6 id=6 data-nosnippet>6</a>//!
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<a href=#7 id=7 data-nosnippet>7</a>//! <br>
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<a href=#8 id=8 data-nosnippet>8</a>//!
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<a href=#9 id=9 data-nosnippet>9</a>//! This library provides [`anyhow::Error`][Error], a trait object based error
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<a href=#10 id=10 data-nosnippet>10</a>//! type for easy idiomatic error handling in Rust applications.
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<a href=#11 id=11 data-nosnippet>11</a>//!
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<a href=#12 id=12 data-nosnippet>12</a>//! <br>
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<a href=#13 id=13 data-nosnippet>13</a>//!
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<a href=#14 id=14 data-nosnippet>14</a>//! # Details
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<a href=#15 id=15 data-nosnippet>15</a>//!
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<a href=#16 id=16 data-nosnippet>16</a>//! - Use `Result<T, anyhow::Error>`, or equivalently `anyhow::Result<T>`, as
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<a href=#17 id=17 data-nosnippet>17</a>//! the return type of any fallible function.
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<a href=#18 id=18 data-nosnippet>18</a>//!
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<a href=#19 id=19 data-nosnippet>19</a>//! Within the function, use `?` to easily propagate any error that implements
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<a href=#20 id=20 data-nosnippet>20</a>//! the [`std::error::Error`] trait.
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<a href=#21 id=21 data-nosnippet>21</a>//!
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<a href=#22 id=22 data-nosnippet>22</a>//! ```
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<a href=#23 id=23 data-nosnippet>23</a>//! # pub trait Deserialize {}
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<a href=#24 id=24 data-nosnippet>24</a>//! #
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<a href=#25 id=25 data-nosnippet>25</a>//! # mod serde_json {
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<a href=#26 id=26 data-nosnippet>26</a>//! # use super::Deserialize;
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<a href=#27 id=27 data-nosnippet>27</a>//! # use std::io;
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<a href=#28 id=28 data-nosnippet>28</a>//! #
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<a href=#29 id=29 data-nosnippet>29</a>//! # pub fn from_str<T: Deserialize>(json: &str) -> io::Result<T> {
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<a href=#30 id=30 data-nosnippet>30</a>//! # unimplemented!()
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<a href=#31 id=31 data-nosnippet>31</a>//! # }
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<a href=#32 id=32 data-nosnippet>32</a>//! # }
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<a href=#33 id=33 data-nosnippet>33</a>//! #
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<a href=#34 id=34 data-nosnippet>34</a>//! # struct ClusterMap;
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<a href=#35 id=35 data-nosnippet>35</a>//! #
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<a href=#36 id=36 data-nosnippet>36</a>//! # impl Deserialize for ClusterMap {}
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<a href=#37 id=37 data-nosnippet>37</a>//! #
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<a href=#38 id=38 data-nosnippet>38</a>//! use anyhow::Result;
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<a href=#39 id=39 data-nosnippet>39</a>//!
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<a href=#40 id=40 data-nosnippet>40</a>//! fn get_cluster_info() -> Result<ClusterMap> {
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<a href=#41 id=41 data-nosnippet>41</a>//! let config = std::fs::read_to_string("cluster.json")?;
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<a href=#42 id=42 data-nosnippet>42</a>//! let map: ClusterMap = serde_json::from_str(&config)?;
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<a href=#43 id=43 data-nosnippet>43</a>//! Ok(map)
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<a href=#44 id=44 data-nosnippet>44</a>//! }
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<a href=#45 id=45 data-nosnippet>45</a>//! #
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<a href=#46 id=46 data-nosnippet>46</a>//! # fn main() {}
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<a href=#47 id=47 data-nosnippet>47</a>//! ```
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<a href=#48 id=48 data-nosnippet>48</a>//!
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<a href=#49 id=49 data-nosnippet>49</a>//! - Attach context to help the person troubleshooting the error understand
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<a href=#50 id=50 data-nosnippet>50</a>//! where things went wrong. A low-level error like "No such file or
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<a href=#51 id=51 data-nosnippet>51</a>//! directory" can be annoying to debug without more context about what higher
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<a href=#52 id=52 data-nosnippet>52</a>//! level step the application was in the middle of.
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<a href=#53 id=53 data-nosnippet>53</a>//!
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<a href=#54 id=54 data-nosnippet>54</a>//! ```
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<a href=#55 id=55 data-nosnippet>55</a>//! # struct It;
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<a href=#56 id=56 data-nosnippet>56</a>//! #
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<a href=#57 id=57 data-nosnippet>57</a>//! # impl It {
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<a href=#58 id=58 data-nosnippet>58</a>//! # fn detach(&self) -> Result<()> {
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<a href=#59 id=59 data-nosnippet>59</a>//! # unimplemented!()
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<a href=#60 id=60 data-nosnippet>60</a>//! # }
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<a href=#61 id=61 data-nosnippet>61</a>//! # }
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<a href=#62 id=62 data-nosnippet>62</a>//! #
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<a href=#63 id=63 data-nosnippet>63</a>//! use anyhow::{Context, Result};
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<a href=#64 id=64 data-nosnippet>64</a>//!
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<a href=#65 id=65 data-nosnippet>65</a>//! fn main() -> Result<()> {
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<a href=#66 id=66 data-nosnippet>66</a>//! # return Ok(());
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<a href=#67 id=67 data-nosnippet>67</a>//! #
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<a href=#68 id=68 data-nosnippet>68</a>//! # const _: &str = stringify! {
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<a href=#69 id=69 data-nosnippet>69</a>//! ...
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<a href=#70 id=70 data-nosnippet>70</a>//! # };
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<a href=#71 id=71 data-nosnippet>71</a>//! #
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<a href=#72 id=72 data-nosnippet>72</a>//! # let it = It;
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<a href=#73 id=73 data-nosnippet>73</a>//! # let path = "./path/to/instrs.json";
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<a href=#74 id=74 data-nosnippet>74</a>//! #
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<a href=#75 id=75 data-nosnippet>75</a>//! it.detach().context("Failed to detach the important thing")?;
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<a href=#76 id=76 data-nosnippet>76</a>//!
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<a href=#77 id=77 data-nosnippet>77</a>//! let content = std::fs::read(path)
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<a href=#78 id=78 data-nosnippet>78</a>//! .with_context(|| format!("Failed to read instrs from {}", path))?;
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<a href=#79 id=79 data-nosnippet>79</a>//! #
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<a href=#80 id=80 data-nosnippet>80</a>//! # const _: &str = stringify! {
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<a href=#81 id=81 data-nosnippet>81</a>//! ...
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<a href=#82 id=82 data-nosnippet>82</a>//! # };
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<a href=#83 id=83 data-nosnippet>83</a>//! #
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<a href=#84 id=84 data-nosnippet>84</a>//! # Ok(())
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<a href=#85 id=85 data-nosnippet>85</a>//! }
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<a href=#86 id=86 data-nosnippet>86</a>//! ```
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<a href=#87 id=87 data-nosnippet>87</a>//!
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<a href=#88 id=88 data-nosnippet>88</a>//! ```console
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<a href=#89 id=89 data-nosnippet>89</a>//! Error: Failed to read instrs from ./path/to/instrs.json
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<a href=#90 id=90 data-nosnippet>90</a>//!
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<a href=#91 id=91 data-nosnippet>91</a>//! Caused by:
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<a href=#92 id=92 data-nosnippet>92</a>//! No such file or directory (os error 2)
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<a href=#93 id=93 data-nosnippet>93</a>//! ```
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<a href=#94 id=94 data-nosnippet>94</a>//!
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<a href=#95 id=95 data-nosnippet>95</a>//! - Downcasting is supported and can be by value, by shared reference, or by
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<a href=#96 id=96 data-nosnippet>96</a>//! mutable reference as needed.
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<a href=#97 id=97 data-nosnippet>97</a>//!
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<a href=#98 id=98 data-nosnippet>98</a>//! ```
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<a href=#99 id=99 data-nosnippet>99</a>//! # use anyhow::anyhow;
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<a href=#100 id=100 data-nosnippet>100</a>//! # use std::fmt::{self, Display};
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<a href=#101 id=101 data-nosnippet>101</a>//! # use std::task::Poll;
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<a href=#102 id=102 data-nosnippet>102</a>//! #
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<a href=#103 id=103 data-nosnippet>103</a>//! # #[derive(Debug)]
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<a href=#104 id=104 data-nosnippet>104</a>//! # enum DataStoreError {
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<a href=#105 id=105 data-nosnippet>105</a>//! # Censored(()),
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<a href=#106 id=106 data-nosnippet>106</a>//! # }
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<a href=#107 id=107 data-nosnippet>107</a>//! #
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<a href=#108 id=108 data-nosnippet>108</a>//! # impl Display for DataStoreError {
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<a href=#109 id=109 data-nosnippet>109</a>//! # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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<a href=#110 id=110 data-nosnippet>110</a>//! # unimplemented!()
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<a href=#111 id=111 data-nosnippet>111</a>//! # }
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<a href=#112 id=112 data-nosnippet>112</a>//! # }
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<a href=#113 id=113 data-nosnippet>113</a>//! #
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<a href=#114 id=114 data-nosnippet>114</a>//! # impl std::error::Error for DataStoreError {}
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<a href=#115 id=115 data-nosnippet>115</a>//! #
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<a href=#116 id=116 data-nosnippet>116</a>//! # const REDACTED_CONTENT: () = ();
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<a href=#117 id=117 data-nosnippet>117</a>//! #
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<a href=#118 id=118 data-nosnippet>118</a>//! # let error = anyhow!("...");
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<a href=#119 id=119 data-nosnippet>119</a>//! # let root_cause = &error;
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<a href=#120 id=120 data-nosnippet>120</a>//! #
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<a href=#121 id=121 data-nosnippet>121</a>//! # let ret =
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<a href=#122 id=122 data-nosnippet>122</a>//! // If the error was caused by redaction, then return a
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<a href=#123 id=123 data-nosnippet>123</a>//! // tombstone instead of the content.
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<a href=#124 id=124 data-nosnippet>124</a>//! match root_cause.downcast_ref::<DataStoreError>() {
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<a href=#125 id=125 data-nosnippet>125</a>//! Some(DataStoreError::Censored(_)) => Ok(Poll::Ready(REDACTED_CONTENT)),
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<a href=#126 id=126 data-nosnippet>126</a>//! None => Err(error),
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<a href=#127 id=127 data-nosnippet>127</a>//! }
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<a href=#128 id=128 data-nosnippet>128</a>//! # ;
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<a href=#129 id=129 data-nosnippet>129</a>//! ```
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<a href=#130 id=130 data-nosnippet>130</a>//!
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<a href=#131 id=131 data-nosnippet>131</a>//! - If using Rust &ge; 1.65, a backtrace is captured and printed with the
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<a href=#132 id=132 data-nosnippet>132</a>//! error if the underlying error type does not already provide its own. In
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<a href=#133 id=133 data-nosnippet>133</a>//! order to see backtraces, they must be enabled through the environment
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<a href=#134 id=134 data-nosnippet>134</a>//! variables described in [`std::backtrace`]:
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<a href=#135 id=135 data-nosnippet>135</a>//!
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<a href=#136 id=136 data-nosnippet>136</a>//! - If you want panics and errors to both have backtraces, set
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<a href=#137 id=137 data-nosnippet>137</a>//! `RUST_BACKTRACE=1`;
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<a href=#138 id=138 data-nosnippet>138</a>//! - If you want only errors to have backtraces, set `RUST_LIB_BACKTRACE=1`;
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<a href=#139 id=139 data-nosnippet>139</a>//! - If you want only panics to have backtraces, set `RUST_BACKTRACE=1` and
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<a href=#140 id=140 data-nosnippet>140</a>//! `RUST_LIB_BACKTRACE=0`.
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<a href=#141 id=141 data-nosnippet>141</a>//!
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<a href=#142 id=142 data-nosnippet>142</a>//! [`std::backtrace`]: std::backtrace#environment-variables
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<a href=#143 id=143 data-nosnippet>143</a>//!
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<a href=#144 id=144 data-nosnippet>144</a>//! - Anyhow works with any error type that has an impl of `std::error::Error`,
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<a href=#145 id=145 data-nosnippet>145</a>//! including ones defined in your crate. We do not bundle a `derive(Error)`
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<a href=#146 id=146 data-nosnippet>146</a>//! macro but you can write the impls yourself or use a standalone macro like
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<a href=#147 id=147 data-nosnippet>147</a>//! [thiserror].
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<a href=#148 id=148 data-nosnippet>148</a>//!
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<a href=#149 id=149 data-nosnippet>149</a>//! [thiserror]: https://github.com/dtolnay/thiserror
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<a href=#150 id=150 data-nosnippet>150</a>//!
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<a href=#151 id=151 data-nosnippet>151</a>//! ```
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<a href=#152 id=152 data-nosnippet>152</a>//! use thiserror::Error;
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<a href=#153 id=153 data-nosnippet>153</a>//!
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<a href=#154 id=154 data-nosnippet>154</a>//! #[derive(Error, Debug)]
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<a href=#155 id=155 data-nosnippet>155</a>//! pub enum FormatError {
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<a href=#156 id=156 data-nosnippet>156</a>//! #[error("Invalid header (expected {expected:?}, got {found:?})")]
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<a href=#157 id=157 data-nosnippet>157</a>//! InvalidHeader {
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<a href=#158 id=158 data-nosnippet>158</a>//! expected: String,
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<a href=#159 id=159 data-nosnippet>159</a>//! found: String,
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<a href=#160 id=160 data-nosnippet>160</a>//! },
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<a href=#161 id=161 data-nosnippet>161</a>//! #[error("Missing attribute: {0}")]
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<a href=#162 id=162 data-nosnippet>162</a>//! MissingAttribute(String),
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<a href=#163 id=163 data-nosnippet>163</a>//! }
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<a href=#164 id=164 data-nosnippet>164</a>//! ```
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<a href=#165 id=165 data-nosnippet>165</a>//!
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<a href=#166 id=166 data-nosnippet>166</a>//! - One-off error messages can be constructed using the `anyhow!` macro, which
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<a href=#167 id=167 data-nosnippet>167</a>//! supports string interpolation and produces an `anyhow::Error`.
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<a href=#168 id=168 data-nosnippet>168</a>//!
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<a href=#169 id=169 data-nosnippet>169</a>//! ```
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<a href=#170 id=170 data-nosnippet>170</a>//! # use anyhow::{anyhow, Result};
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<a href=#171 id=171 data-nosnippet>171</a>//! #
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<a href=#172 id=172 data-nosnippet>172</a>//! # fn demo() -> Result<()> {
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<a href=#173 id=173 data-nosnippet>173</a>//! # let missing = "...";
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<a href=#174 id=174 data-nosnippet>174</a>//! return Err(anyhow!("Missing attribute: {}", missing));
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<a href=#175 id=175 data-nosnippet>175</a>//! # Ok(())
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<a href=#176 id=176 data-nosnippet>176</a>//! # }
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<a href=#177 id=177 data-nosnippet>177</a>//! ```
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<a href=#178 id=178 data-nosnippet>178</a>//!
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<a href=#179 id=179 data-nosnippet>179</a>//! A `bail!` macro is provided as a shorthand for the same early return.
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<a href=#180 id=180 data-nosnippet>180</a>//!
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<a href=#181 id=181 data-nosnippet>181</a>//! ```
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<a href=#182 id=182 data-nosnippet>182</a>//! # use anyhow::{bail, Result};
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<a href=#183 id=183 data-nosnippet>183</a>//! #
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<a href=#184 id=184 data-nosnippet>184</a>//! # fn demo() -> Result<()> {
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<a href=#185 id=185 data-nosnippet>185</a>//! # let missing = "...";
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<a href=#186 id=186 data-nosnippet>186</a>//! bail!("Missing attribute: {}", missing);
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<a href=#187 id=187 data-nosnippet>187</a>//! # Ok(())
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<a href=#188 id=188 data-nosnippet>188</a>//! # }
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<a href=#189 id=189 data-nosnippet>189</a>//! ```
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<a href=#190 id=190 data-nosnippet>190</a>//!
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<a href=#191 id=191 data-nosnippet>191</a>//! <br>
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<a href=#192 id=192 data-nosnippet>192</a>//!
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<a href=#193 id=193 data-nosnippet>193</a>//! # No-std support
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<a href=#194 id=194 data-nosnippet>194</a>//!
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<a href=#195 id=195 data-nosnippet>195</a>//! In no_std mode, almost all of the same API is available and works the same
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<a href=#196 id=196 data-nosnippet>196</a>//! way. To depend on Anyhow in no_std mode, disable our default enabled "std"
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<a href=#197 id=197 data-nosnippet>197</a>//! feature in Cargo.toml. A global allocator is required.
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<a href=#198 id=198 data-nosnippet>198</a>//!
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<a href=#199 id=199 data-nosnippet>199</a>//! ```toml
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<a href=#200 id=200 data-nosnippet>200</a>//! [dependencies]
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<a href=#201 id=201 data-nosnippet>201</a>//! anyhow = { version = "1.0", default-features = false }
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<a href=#202 id=202 data-nosnippet>202</a>//! ```
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<a href=#203 id=203 data-nosnippet>203</a>//!
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<a href=#204 id=204 data-nosnippet>204</a>//! With versions of Rust older than 1.81, no_std mode may require an additional
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<a href=#205 id=205 data-nosnippet>205</a>//! `.map_err(Error::msg)` when working with a non-Anyhow error type inside a
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<a href=#206 id=206 data-nosnippet>206</a>//! function that returns Anyhow's error type, as the trait that `?`-based error
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<a href=#207 id=207 data-nosnippet>207</a>//! conversions are defined by is only available in std in those old versions.
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<a href=#208 id=208 data-nosnippet>208</a>
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<a href=#209 id=209 data-nosnippet>209</a></span><span class="attr">#![doc(html_root_url = <span class="string">"https://docs.rs/anyhow/1.0.102"</span>)]
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<a href=#210 id=210 data-nosnippet>210</a>#![cfg_attr(error_generic_member_access, feature(error_generic_member_access))]
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<a href=#211 id=211 data-nosnippet>211</a>#![no_std]
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<a href=#212 id=212 data-nosnippet>212</a>#![deny(dead_code, unsafe_op_in_unsafe_fn, unused_imports, unused_mut)]
|
|
<a href=#213 id=213 data-nosnippet>213</a>#![allow(
|
|
<a href=#214 id=214 data-nosnippet>214</a> clippy::doc_markdown,
|
|
<a href=#215 id=215 data-nosnippet>215</a> clippy::elidable_lifetime_names,
|
|
<a href=#216 id=216 data-nosnippet>216</a> clippy::enum_glob_use,
|
|
<a href=#217 id=217 data-nosnippet>217</a> clippy::explicit_auto_deref,
|
|
<a href=#218 id=218 data-nosnippet>218</a> clippy::extra_unused_type_parameters,
|
|
<a href=#219 id=219 data-nosnippet>219</a> clippy::incompatible_msrv,
|
|
<a href=#220 id=220 data-nosnippet>220</a> clippy::let_underscore_untyped,
|
|
<a href=#221 id=221 data-nosnippet>221</a> clippy::missing_errors_doc,
|
|
<a href=#222 id=222 data-nosnippet>222</a> clippy::missing_panics_doc,
|
|
<a href=#223 id=223 data-nosnippet>223</a> clippy::module_name_repetitions,
|
|
<a href=#224 id=224 data-nosnippet>224</a> clippy::must_use_candidate,
|
|
<a href=#225 id=225 data-nosnippet>225</a> clippy::needless_doctest_main,
|
|
<a href=#226 id=226 data-nosnippet>226</a> clippy::needless_lifetimes,
|
|
<a href=#227 id=227 data-nosnippet>227</a> clippy::new_ret_no_self,
|
|
<a href=#228 id=228 data-nosnippet>228</a> clippy::redundant_else,
|
|
<a href=#229 id=229 data-nosnippet>229</a> clippy::return_self_not_must_use,
|
|
<a href=#230 id=230 data-nosnippet>230</a> clippy::struct_field_names,
|
|
<a href=#231 id=231 data-nosnippet>231</a> clippy::uninlined_format_args,
|
|
<a href=#232 id=232 data-nosnippet>232</a> clippy::unused_self,
|
|
<a href=#233 id=233 data-nosnippet>233</a> clippy::used_underscore_binding,
|
|
<a href=#234 id=234 data-nosnippet>234</a> clippy::wildcard_imports,
|
|
<a href=#235 id=235 data-nosnippet>235</a> clippy::wrong_self_convention
|
|
<a href=#236 id=236 data-nosnippet>236</a>)]
|
|
<a href=#237 id=237 data-nosnippet>237</a>#![allow(unknown_lints, mismatched_lifetime_syntaxes)]
|
|
<a href=#238 id=238 data-nosnippet>238</a>
|
|
<a href=#239 id=239 data-nosnippet>239</a>#[cfg(all(
|
|
<a href=#240 id=240 data-nosnippet>240</a> anyhow_nightly_testing,
|
|
<a href=#241 id=241 data-nosnippet>241</a> feature = <span class="string">"std"</span>,
|
|
<a href=#242 id=242 data-nosnippet>242</a> not(error_generic_member_access)
|
|
<a href=#243 id=243 data-nosnippet>243</a>))]
|
|
<a href=#244 id=244 data-nosnippet>244</a></span><span class="macro">compile_error!</span>(<span class="string">"Build script probe failed to compile."</span>);
|
|
<a href=#245 id=245 data-nosnippet>245</a>
|
|
<a href=#246 id=246 data-nosnippet>246</a><span class="kw">extern crate </span>alloc;
|
|
<a href=#247 id=247 data-nosnippet>247</a>
|
|
<a href=#248 id=248 data-nosnippet>248</a><span class="attr">#[cfg(feature = <span class="string">"std"</span>)]
|
|
<a href=#249 id=249 data-nosnippet>249</a></span><span class="kw">extern crate </span>std;
|
|
<a href=#250 id=250 data-nosnippet>250</a>
|
|
<a href=#251 id=251 data-nosnippet>251</a><span class="attr">#[macro_use]
|
|
<a href=#252 id=252 data-nosnippet>252</a></span><span class="kw">mod </span>backtrace;
|
|
<a href=#253 id=253 data-nosnippet>253</a><span class="kw">mod </span>chain;
|
|
<a href=#254 id=254 data-nosnippet>254</a><span class="kw">mod </span>context;
|
|
<a href=#255 id=255 data-nosnippet>255</a><span class="kw">mod </span>ensure;
|
|
<a href=#256 id=256 data-nosnippet>256</a><span class="kw">mod </span>error;
|
|
<a href=#257 id=257 data-nosnippet>257</a><span class="kw">mod </span>fmt;
|
|
<a href=#258 id=258 data-nosnippet>258</a><span class="kw">mod </span>kind;
|
|
<a href=#259 id=259 data-nosnippet>259</a><span class="kw">mod </span>macros;
|
|
<a href=#260 id=260 data-nosnippet>260</a><span class="attr">#[cfg(error_generic_member_access)]
|
|
<a href=#261 id=261 data-nosnippet>261</a></span><span class="kw">mod </span>nightly;
|
|
<a href=#262 id=262 data-nosnippet>262</a><span class="kw">mod </span>ptr;
|
|
<a href=#263 id=263 data-nosnippet>263</a><span class="kw">mod </span>wrapper;
|
|
<a href=#264 id=264 data-nosnippet>264</a>
|
|
<a href=#265 id=265 data-nosnippet>265</a><span class="kw">use </span><span class="kw">crate</span>::error::ErrorImpl;
|
|
<a href=#266 id=266 data-nosnippet>266</a><span class="kw">use </span><span class="kw">crate</span>::ptr::Own;
|
|
<a href=#267 id=267 data-nosnippet>267</a><span class="kw">use </span>core::fmt::Display;
|
|
<a href=#268 id=268 data-nosnippet>268</a>
|
|
<a href=#269 id=269 data-nosnippet>269</a><span class="attr">#[cfg(all(not(feature = <span class="string">"std"</span>), anyhow_no_core_error))]
|
|
<a href=#270 id=270 data-nosnippet>270</a></span><span class="kw">use </span>core::fmt::Debug;
|
|
<a href=#271 id=271 data-nosnippet>271</a>
|
|
<a href=#272 id=272 data-nosnippet>272</a><span class="attr">#[cfg(feature = <span class="string">"std"</span>)]
|
|
<a href=#273 id=273 data-nosnippet>273</a></span><span class="kw">use </span>std::error::Error <span class="kw">as </span>StdError;
|
|
<a href=#274 id=274 data-nosnippet>274</a>
|
|
<a href=#275 id=275 data-nosnippet>275</a><span class="attr">#[cfg(not(any(feature = <span class="string">"std"</span>, anyhow_no_core_error)))]
|
|
<a href=#276 id=276 data-nosnippet>276</a></span><span class="kw">use </span>core::error::Error <span class="kw">as </span>StdError;
|
|
<a href=#277 id=277 data-nosnippet>277</a>
|
|
<a href=#278 id=278 data-nosnippet>278</a><span class="attr">#[cfg(all(not(feature = <span class="string">"std"</span>), anyhow_no_core_error))]
|
|
<a href=#279 id=279 data-nosnippet>279</a></span><span class="kw">trait </span>StdError: Debug + Display {
|
|
<a href=#280 id=280 data-nosnippet>280</a> <span class="kw">fn </span>source(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>(<span class="kw">dyn </span>StdError + <span class="lifetime">'static</span>)> {
|
|
<a href=#281 id=281 data-nosnippet>281</a> <span class="prelude-val">None
|
|
<a href=#282 id=282 data-nosnippet>282</a> </span>}
|
|
<a href=#283 id=283 data-nosnippet>283</a>}
|
|
<a href=#284 id=284 data-nosnippet>284</a>
|
|
<a href=#285 id=285 data-nosnippet>285</a><span class="attr">#[doc(no_inline)]
|
|
<a href=#286 id=286 data-nosnippet>286</a></span><span class="kw">pub use </span>anyhow <span class="kw">as </span>format_err;
|
|
<a href=#287 id=287 data-nosnippet>287</a>
|
|
<a href=#288 id=288 data-nosnippet>288</a><span class="doccomment">/// The `Error` type, a wrapper around a dynamic error type.
|
|
<a href=#289 id=289 data-nosnippet>289</a>///
|
|
<a href=#290 id=290 data-nosnippet>290</a>/// `Error` works a lot like `Box<dyn std::error::Error>`, but with these
|
|
<a href=#291 id=291 data-nosnippet>291</a>/// differences:
|
|
<a href=#292 id=292 data-nosnippet>292</a>///
|
|
<a href=#293 id=293 data-nosnippet>293</a>/// - `Error` requires that the error is `Send`, `Sync`, and `'static`.
|
|
<a href=#294 id=294 data-nosnippet>294</a>/// - `Error` guarantees that a backtrace is available, even if the underlying
|
|
<a href=#295 id=295 data-nosnippet>295</a>/// error type does not provide one.
|
|
<a href=#296 id=296 data-nosnippet>296</a>/// - `Error` is represented as a narrow pointer &mdash; exactly one word in
|
|
<a href=#297 id=297 data-nosnippet>297</a>/// size instead of two.
|
|
<a href=#298 id=298 data-nosnippet>298</a>///
|
|
<a href=#299 id=299 data-nosnippet>299</a>/// <br>
|
|
<a href=#300 id=300 data-nosnippet>300</a>///
|
|
<a href=#301 id=301 data-nosnippet>301</a>/// # Display representations
|
|
<a href=#302 id=302 data-nosnippet>302</a>///
|
|
<a href=#303 id=303 data-nosnippet>303</a>/// When you print an error object using "{}" or to_string(), only the outermost
|
|
<a href=#304 id=304 data-nosnippet>304</a>/// underlying error or context is printed, not any of the lower level causes.
|
|
<a href=#305 id=305 data-nosnippet>305</a>/// This is exactly as if you had called the Display impl of the error from
|
|
<a href=#306 id=306 data-nosnippet>306</a>/// which you constructed your anyhow::Error.
|
|
<a href=#307 id=307 data-nosnippet>307</a>///
|
|
<a href=#308 id=308 data-nosnippet>308</a>/// ```console
|
|
<a href=#309 id=309 data-nosnippet>309</a>/// Failed to read instrs from ./path/to/instrs.json
|
|
<a href=#310 id=310 data-nosnippet>310</a>/// ```
|
|
<a href=#311 id=311 data-nosnippet>311</a>///
|
|
<a href=#312 id=312 data-nosnippet>312</a>/// To print causes as well using anyhow's default formatting of causes, use the
|
|
<a href=#313 id=313 data-nosnippet>313</a>/// alternate selector "{:#}".
|
|
<a href=#314 id=314 data-nosnippet>314</a>///
|
|
<a href=#315 id=315 data-nosnippet>315</a>/// ```console
|
|
<a href=#316 id=316 data-nosnippet>316</a>/// Failed to read instrs from ./path/to/instrs.json: No such file or directory (os error 2)
|
|
<a href=#317 id=317 data-nosnippet>317</a>/// ```
|
|
<a href=#318 id=318 data-nosnippet>318</a>///
|
|
<a href=#319 id=319 data-nosnippet>319</a>/// The Debug format "{:?}" includes your backtrace if one was captured. Note
|
|
<a href=#320 id=320 data-nosnippet>320</a>/// that this is the representation you get by default if you return an error
|
|
<a href=#321 id=321 data-nosnippet>321</a>/// from `fn main` instead of printing it explicitly yourself.
|
|
<a href=#322 id=322 data-nosnippet>322</a>///
|
|
<a href=#323 id=323 data-nosnippet>323</a>/// ```console
|
|
<a href=#324 id=324 data-nosnippet>324</a>/// Error: Failed to read instrs from ./path/to/instrs.json
|
|
<a href=#325 id=325 data-nosnippet>325</a>///
|
|
<a href=#326 id=326 data-nosnippet>326</a>/// Caused by:
|
|
<a href=#327 id=327 data-nosnippet>327</a>/// No such file or directory (os error 2)
|
|
<a href=#328 id=328 data-nosnippet>328</a>/// ```
|
|
<a href=#329 id=329 data-nosnippet>329</a>///
|
|
<a href=#330 id=330 data-nosnippet>330</a>/// and if there is a backtrace available:
|
|
<a href=#331 id=331 data-nosnippet>331</a>///
|
|
<a href=#332 id=332 data-nosnippet>332</a>/// ```console
|
|
<a href=#333 id=333 data-nosnippet>333</a>/// Error: Failed to read instrs from ./path/to/instrs.json
|
|
<a href=#334 id=334 data-nosnippet>334</a>///
|
|
<a href=#335 id=335 data-nosnippet>335</a>/// Caused by:
|
|
<a href=#336 id=336 data-nosnippet>336</a>/// No such file or directory (os error 2)
|
|
<a href=#337 id=337 data-nosnippet>337</a>///
|
|
<a href=#338 id=338 data-nosnippet>338</a>/// Stack backtrace:
|
|
<a href=#339 id=339 data-nosnippet>339</a>/// 0: <E as anyhow::context::ext::StdError>::ext_context
|
|
<a href=#340 id=340 data-nosnippet>340</a>/// at /git/anyhow/src/backtrace.rs:26
|
|
<a href=#341 id=341 data-nosnippet>341</a>/// 1: core::result::Result<T,E>::map_err
|
|
<a href=#342 id=342 data-nosnippet>342</a>/// at /git/rustc/src/libcore/result.rs:596
|
|
<a href=#343 id=343 data-nosnippet>343</a>/// 2: anyhow::context::<impl anyhow::Context<T,E> for core::result::Result<T,E>>::with_context
|
|
<a href=#344 id=344 data-nosnippet>344</a>/// at /git/anyhow/src/context.rs:58
|
|
<a href=#345 id=345 data-nosnippet>345</a>/// 3: testing::main
|
|
<a href=#346 id=346 data-nosnippet>346</a>/// at src/main.rs:5
|
|
<a href=#347 id=347 data-nosnippet>347</a>/// 4: std::rt::lang_start
|
|
<a href=#348 id=348 data-nosnippet>348</a>/// at /git/rustc/src/libstd/rt.rs:61
|
|
<a href=#349 id=349 data-nosnippet>349</a>/// 5: main
|
|
<a href=#350 id=350 data-nosnippet>350</a>/// 6: __libc_start_main
|
|
<a href=#351 id=351 data-nosnippet>351</a>/// 7: _start
|
|
<a href=#352 id=352 data-nosnippet>352</a>/// ```
|
|
<a href=#353 id=353 data-nosnippet>353</a>///
|
|
<a href=#354 id=354 data-nosnippet>354</a>/// To see a conventional struct-style Debug representation, use "{:#?}".
|
|
<a href=#355 id=355 data-nosnippet>355</a>///
|
|
<a href=#356 id=356 data-nosnippet>356</a>/// ```console
|
|
<a href=#357 id=357 data-nosnippet>357</a>/// Error {
|
|
<a href=#358 id=358 data-nosnippet>358</a>/// context: "Failed to read instrs from ./path/to/instrs.json",
|
|
<a href=#359 id=359 data-nosnippet>359</a>/// source: Os {
|
|
<a href=#360 id=360 data-nosnippet>360</a>/// code: 2,
|
|
<a href=#361 id=361 data-nosnippet>361</a>/// kind: NotFound,
|
|
<a href=#362 id=362 data-nosnippet>362</a>/// message: "No such file or directory",
|
|
<a href=#363 id=363 data-nosnippet>363</a>/// },
|
|
<a href=#364 id=364 data-nosnippet>364</a>/// }
|
|
<a href=#365 id=365 data-nosnippet>365</a>/// ```
|
|
<a href=#366 id=366 data-nosnippet>366</a>///
|
|
<a href=#367 id=367 data-nosnippet>367</a>/// If none of the built-in representations are appropriate and you would prefer
|
|
<a href=#368 id=368 data-nosnippet>368</a>/// to render the error and its cause chain yourself, it can be done something
|
|
<a href=#369 id=369 data-nosnippet>369</a>/// like this:
|
|
<a href=#370 id=370 data-nosnippet>370</a>///
|
|
<a href=#371 id=371 data-nosnippet>371</a>/// ```
|
|
<a href=#372 id=372 data-nosnippet>372</a>/// use anyhow::{Context, Result};
|
|
<a href=#373 id=373 data-nosnippet>373</a>///
|
|
<a href=#374 id=374 data-nosnippet>374</a>/// fn main() {
|
|
<a href=#375 id=375 data-nosnippet>375</a>/// if let Err(err) = try_main() {
|
|
<a href=#376 id=376 data-nosnippet>376</a>/// eprintln!("ERROR: {}", err);
|
|
<a href=#377 id=377 data-nosnippet>377</a>/// err.chain().skip(1).for_each(|cause| eprintln!("because: {}", cause));
|
|
<a href=#378 id=378 data-nosnippet>378</a>/// std::process::exit(1);
|
|
<a href=#379 id=379 data-nosnippet>379</a>/// }
|
|
<a href=#380 id=380 data-nosnippet>380</a>/// }
|
|
<a href=#381 id=381 data-nosnippet>381</a>///
|
|
<a href=#382 id=382 data-nosnippet>382</a>/// fn try_main() -> Result<()> {
|
|
<a href=#383 id=383 data-nosnippet>383</a>/// # const IGNORE: &str = stringify! {
|
|
<a href=#384 id=384 data-nosnippet>384</a>/// ...
|
|
<a href=#385 id=385 data-nosnippet>385</a>/// # };
|
|
<a href=#386 id=386 data-nosnippet>386</a>/// # Ok(())
|
|
<a href=#387 id=387 data-nosnippet>387</a>/// }
|
|
<a href=#388 id=388 data-nosnippet>388</a>/// ```
|
|
<a href=#389 id=389 data-nosnippet>389</a></span><span class="attr">#[repr(transparent)]
|
|
<a href=#390 id=390 data-nosnippet>390</a></span><span class="kw">pub struct </span>Error {
|
|
<a href=#391 id=391 data-nosnippet>391</a> inner: Own<ErrorImpl>,
|
|
<a href=#392 id=392 data-nosnippet>392</a>}
|
|
<a href=#393 id=393 data-nosnippet>393</a>
|
|
<a href=#394 id=394 data-nosnippet>394</a><span class="doccomment">/// Iterator of a chain of source errors.
|
|
<a href=#395 id=395 data-nosnippet>395</a>///
|
|
<a href=#396 id=396 data-nosnippet>396</a>/// This type is the iterator returned by [`Error::chain`].
|
|
<a href=#397 id=397 data-nosnippet>397</a>///
|
|
<a href=#398 id=398 data-nosnippet>398</a>/// # Example
|
|
<a href=#399 id=399 data-nosnippet>399</a>///
|
|
<a href=#400 id=400 data-nosnippet>400</a>/// ```
|
|
<a href=#401 id=401 data-nosnippet>401</a>/// use anyhow::Error;
|
|
<a href=#402 id=402 data-nosnippet>402</a>/// use std::io;
|
|
<a href=#403 id=403 data-nosnippet>403</a>///
|
|
<a href=#404 id=404 data-nosnippet>404</a>/// pub fn underlying_io_error_kind(error: &Error) -> Option<io::ErrorKind> {
|
|
<a href=#405 id=405 data-nosnippet>405</a>/// for cause in error.chain() {
|
|
<a href=#406 id=406 data-nosnippet>406</a>/// if let Some(io_error) = cause.downcast_ref::<io::Error>() {
|
|
<a href=#407 id=407 data-nosnippet>407</a>/// return Some(io_error.kind());
|
|
<a href=#408 id=408 data-nosnippet>408</a>/// }
|
|
<a href=#409 id=409 data-nosnippet>409</a>/// }
|
|
<a href=#410 id=410 data-nosnippet>410</a>/// None
|
|
<a href=#411 id=411 data-nosnippet>411</a>/// }
|
|
<a href=#412 id=412 data-nosnippet>412</a>/// ```
|
|
<a href=#413 id=413 data-nosnippet>413</a></span><span class="attr">#[cfg(any(feature = <span class="string">"std"</span>, not(anyhow_no_core_error)))]
|
|
<a href=#414 id=414 data-nosnippet>414</a>#[derive(Clone)]
|
|
<a href=#415 id=415 data-nosnippet>415</a></span><span class="kw">pub struct </span>Chain<<span class="lifetime">'a</span>> {
|
|
<a href=#416 id=416 data-nosnippet>416</a> state: <span class="kw">crate</span>::chain::ChainState<<span class="lifetime">'a</span>>,
|
|
<a href=#417 id=417 data-nosnippet>417</a>}
|
|
<a href=#418 id=418 data-nosnippet>418</a>
|
|
<a href=#419 id=419 data-nosnippet>419</a><span class="doccomment">/// `Result<T, Error>`
|
|
<a href=#420 id=420 data-nosnippet>420</a>///
|
|
<a href=#421 id=421 data-nosnippet>421</a>/// This is a reasonable return type to use throughout your application but also
|
|
<a href=#422 id=422 data-nosnippet>422</a>/// for `fn main`; if you do, failures will be printed along with any
|
|
<a href=#423 id=423 data-nosnippet>423</a>/// [context][Context] and a backtrace if one was captured.
|
|
<a href=#424 id=424 data-nosnippet>424</a>///
|
|
<a href=#425 id=425 data-nosnippet>425</a>/// `anyhow::Result` may be used with one *or* two type parameters.
|
|
<a href=#426 id=426 data-nosnippet>426</a>///
|
|
<a href=#427 id=427 data-nosnippet>427</a>/// ```rust
|
|
<a href=#428 id=428 data-nosnippet>428</a>/// use anyhow::Result;
|
|
<a href=#429 id=429 data-nosnippet>429</a>///
|
|
<a href=#430 id=430 data-nosnippet>430</a>/// # const IGNORE: &str = stringify! {
|
|
<a href=#431 id=431 data-nosnippet>431</a>/// fn demo1() -> Result<T> {...}
|
|
<a href=#432 id=432 data-nosnippet>432</a>/// // ^ equivalent to std::result::Result<T, anyhow::Error>
|
|
<a href=#433 id=433 data-nosnippet>433</a>///
|
|
<a href=#434 id=434 data-nosnippet>434</a>/// fn demo2() -> Result<T, OtherError> {...}
|
|
<a href=#435 id=435 data-nosnippet>435</a>/// // ^ equivalent to std::result::Result<T, OtherError>
|
|
<a href=#436 id=436 data-nosnippet>436</a>/// # };
|
|
<a href=#437 id=437 data-nosnippet>437</a>/// ```
|
|
<a href=#438 id=438 data-nosnippet>438</a>///
|
|
<a href=#439 id=439 data-nosnippet>439</a>/// # Example
|
|
<a href=#440 id=440 data-nosnippet>440</a>///
|
|
<a href=#441 id=441 data-nosnippet>441</a>/// ```
|
|
<a href=#442 id=442 data-nosnippet>442</a>/// # pub trait Deserialize {}
|
|
<a href=#443 id=443 data-nosnippet>443</a>/// #
|
|
<a href=#444 id=444 data-nosnippet>444</a>/// # mod serde_json {
|
|
<a href=#445 id=445 data-nosnippet>445</a>/// # use super::Deserialize;
|
|
<a href=#446 id=446 data-nosnippet>446</a>/// # use std::io;
|
|
<a href=#447 id=447 data-nosnippet>447</a>/// #
|
|
<a href=#448 id=448 data-nosnippet>448</a>/// # pub fn from_str<T: Deserialize>(json: &str) -> io::Result<T> {
|
|
<a href=#449 id=449 data-nosnippet>449</a>/// # unimplemented!()
|
|
<a href=#450 id=450 data-nosnippet>450</a>/// # }
|
|
<a href=#451 id=451 data-nosnippet>451</a>/// # }
|
|
<a href=#452 id=452 data-nosnippet>452</a>/// #
|
|
<a href=#453 id=453 data-nosnippet>453</a>/// # #[derive(Debug)]
|
|
<a href=#454 id=454 data-nosnippet>454</a>/// # struct ClusterMap;
|
|
<a href=#455 id=455 data-nosnippet>455</a>/// #
|
|
<a href=#456 id=456 data-nosnippet>456</a>/// # impl Deserialize for ClusterMap {}
|
|
<a href=#457 id=457 data-nosnippet>457</a>/// #
|
|
<a href=#458 id=458 data-nosnippet>458</a>/// use anyhow::Result;
|
|
<a href=#459 id=459 data-nosnippet>459</a>///
|
|
<a href=#460 id=460 data-nosnippet>460</a>/// fn main() -> Result<()> {
|
|
<a href=#461 id=461 data-nosnippet>461</a>/// # return Ok(());
|
|
<a href=#462 id=462 data-nosnippet>462</a>/// let config = std::fs::read_to_string("cluster.json")?;
|
|
<a href=#463 id=463 data-nosnippet>463</a>/// let map: ClusterMap = serde_json::from_str(&config)?;
|
|
<a href=#464 id=464 data-nosnippet>464</a>/// println!("cluster info: {:#?}", map);
|
|
<a href=#465 id=465 data-nosnippet>465</a>/// Ok(())
|
|
<a href=#466 id=466 data-nosnippet>466</a>/// }
|
|
<a href=#467 id=467 data-nosnippet>467</a>/// ```
|
|
<a href=#468 id=468 data-nosnippet>468</a></span><span class="kw">pub type </span><span class="prelude-ty">Result</span><T, E = Error> = core::result::Result<T, E>;
|
|
<a href=#469 id=469 data-nosnippet>469</a>
|
|
<a href=#470 id=470 data-nosnippet>470</a><span class="doccomment">/// Provides the `context` method for `Result`.
|
|
<a href=#471 id=471 data-nosnippet>471</a>///
|
|
<a href=#472 id=472 data-nosnippet>472</a>/// This trait is sealed and cannot be implemented for types outside of
|
|
<a href=#473 id=473 data-nosnippet>473</a>/// `anyhow`.
|
|
<a href=#474 id=474 data-nosnippet>474</a>///
|
|
<a href=#475 id=475 data-nosnippet>475</a>/// <br>
|
|
<a href=#476 id=476 data-nosnippet>476</a>///
|
|
<a href=#477 id=477 data-nosnippet>477</a>/// # Example
|
|
<a href=#478 id=478 data-nosnippet>478</a>///
|
|
<a href=#479 id=479 data-nosnippet>479</a>/// ```
|
|
<a href=#480 id=480 data-nosnippet>480</a>/// use anyhow::{Context, Result};
|
|
<a href=#481 id=481 data-nosnippet>481</a>/// use std::fs;
|
|
<a href=#482 id=482 data-nosnippet>482</a>/// use std::path::PathBuf;
|
|
<a href=#483 id=483 data-nosnippet>483</a>///
|
|
<a href=#484 id=484 data-nosnippet>484</a>/// pub struct ImportantThing {
|
|
<a href=#485 id=485 data-nosnippet>485</a>/// path: PathBuf,
|
|
<a href=#486 id=486 data-nosnippet>486</a>/// }
|
|
<a href=#487 id=487 data-nosnippet>487</a>///
|
|
<a href=#488 id=488 data-nosnippet>488</a>/// impl ImportantThing {
|
|
<a href=#489 id=489 data-nosnippet>489</a>/// # const IGNORE: &'static str = stringify! {
|
|
<a href=#490 id=490 data-nosnippet>490</a>/// pub fn detach(&mut self) -> Result<()> {...}
|
|
<a href=#491 id=491 data-nosnippet>491</a>/// # };
|
|
<a href=#492 id=492 data-nosnippet>492</a>/// # fn detach(&mut self) -> Result<()> {
|
|
<a href=#493 id=493 data-nosnippet>493</a>/// # unimplemented!()
|
|
<a href=#494 id=494 data-nosnippet>494</a>/// # }
|
|
<a href=#495 id=495 data-nosnippet>495</a>/// }
|
|
<a href=#496 id=496 data-nosnippet>496</a>///
|
|
<a href=#497 id=497 data-nosnippet>497</a>/// pub fn do_it(mut it: ImportantThing) -> Result<Vec<u8>> {
|
|
<a href=#498 id=498 data-nosnippet>498</a>/// it.detach().context("Failed to detach the important thing")?;
|
|
<a href=#499 id=499 data-nosnippet>499</a>///
|
|
<a href=#500 id=500 data-nosnippet>500</a>/// let path = &it.path;
|
|
<a href=#501 id=501 data-nosnippet>501</a>/// let content = fs::read(path)
|
|
<a href=#502 id=502 data-nosnippet>502</a>/// .with_context(|| format!("Failed to read instrs from {}", path.display()))?;
|
|
<a href=#503 id=503 data-nosnippet>503</a>///
|
|
<a href=#504 id=504 data-nosnippet>504</a>/// Ok(content)
|
|
<a href=#505 id=505 data-nosnippet>505</a>/// }
|
|
<a href=#506 id=506 data-nosnippet>506</a>/// ```
|
|
<a href=#507 id=507 data-nosnippet>507</a>///
|
|
<a href=#508 id=508 data-nosnippet>508</a>/// When printed, the outermost context would be printed first and the lower
|
|
<a href=#509 id=509 data-nosnippet>509</a>/// level underlying causes would be enumerated below.
|
|
<a href=#510 id=510 data-nosnippet>510</a>///
|
|
<a href=#511 id=511 data-nosnippet>511</a>/// ```console
|
|
<a href=#512 id=512 data-nosnippet>512</a>/// Error: Failed to read instrs from ./path/to/instrs.json
|
|
<a href=#513 id=513 data-nosnippet>513</a>///
|
|
<a href=#514 id=514 data-nosnippet>514</a>/// Caused by:
|
|
<a href=#515 id=515 data-nosnippet>515</a>/// No such file or directory (os error 2)
|
|
<a href=#516 id=516 data-nosnippet>516</a>/// ```
|
|
<a href=#517 id=517 data-nosnippet>517</a>///
|
|
<a href=#518 id=518 data-nosnippet>518</a>/// Refer to the [Display representations] documentation for other forms in
|
|
<a href=#519 id=519 data-nosnippet>519</a>/// which this context chain can be rendered.
|
|
<a href=#520 id=520 data-nosnippet>520</a>///
|
|
<a href=#521 id=521 data-nosnippet>521</a>/// [Display representations]: Error#display-representations
|
|
<a href=#522 id=522 data-nosnippet>522</a>///
|
|
<a href=#523 id=523 data-nosnippet>523</a>/// <br>
|
|
<a href=#524 id=524 data-nosnippet>524</a>///
|
|
<a href=#525 id=525 data-nosnippet>525</a>/// # Effect on downcasting
|
|
<a href=#526 id=526 data-nosnippet>526</a>///
|
|
<a href=#527 id=527 data-nosnippet>527</a>/// After attaching context of type `C` onto an error of type `E`, the resulting
|
|
<a href=#528 id=528 data-nosnippet>528</a>/// `anyhow::Error` may be downcast to `C` **or** to `E`.
|
|
<a href=#529 id=529 data-nosnippet>529</a>///
|
|
<a href=#530 id=530 data-nosnippet>530</a>/// That is, in codebases that rely on downcasting, Anyhow's context supports
|
|
<a href=#531 id=531 data-nosnippet>531</a>/// both of the following use cases:
|
|
<a href=#532 id=532 data-nosnippet>532</a>///
|
|
<a href=#533 id=533 data-nosnippet>533</a>/// - **Attaching context whose type is insignificant onto errors whose type
|
|
<a href=#534 id=534 data-nosnippet>534</a>/// is used in downcasts.**
|
|
<a href=#535 id=535 data-nosnippet>535</a>///
|
|
<a href=#536 id=536 data-nosnippet>536</a>/// In other error libraries whose context is not designed this way, it can
|
|
<a href=#537 id=537 data-nosnippet>537</a>/// be risky to introduce context to existing code because new context might
|
|
<a href=#538 id=538 data-nosnippet>538</a>/// break existing working downcasts. In Anyhow, any downcast that worked
|
|
<a href=#539 id=539 data-nosnippet>539</a>/// before adding context will continue to work after you add a context, so
|
|
<a href=#540 id=540 data-nosnippet>540</a>/// you should freely add human-readable context to errors wherever it would
|
|
<a href=#541 id=541 data-nosnippet>541</a>/// be helpful.
|
|
<a href=#542 id=542 data-nosnippet>542</a>///
|
|
<a href=#543 id=543 data-nosnippet>543</a>/// ```
|
|
<a href=#544 id=544 data-nosnippet>544</a>/// # use anyhow::bail;
|
|
<a href=#545 id=545 data-nosnippet>545</a>/// # use thiserror::Error;
|
|
<a href=#546 id=546 data-nosnippet>546</a>/// #
|
|
<a href=#547 id=547 data-nosnippet>547</a>/// # #[derive(Error, Debug)]
|
|
<a href=#548 id=548 data-nosnippet>548</a>/// # #[error("???")]
|
|
<a href=#549 id=549 data-nosnippet>549</a>/// # struct SuspiciousError;
|
|
<a href=#550 id=550 data-nosnippet>550</a>/// #
|
|
<a href=#551 id=551 data-nosnippet>551</a>/// # fn helper() -> Result<()> {
|
|
<a href=#552 id=552 data-nosnippet>552</a>/// # bail!(SuspiciousError);
|
|
<a href=#553 id=553 data-nosnippet>553</a>/// # }
|
|
<a href=#554 id=554 data-nosnippet>554</a>/// #
|
|
<a href=#555 id=555 data-nosnippet>555</a>/// use anyhow::{Context, Result};
|
|
<a href=#556 id=556 data-nosnippet>556</a>///
|
|
<a href=#557 id=557 data-nosnippet>557</a>/// fn do_it() -> Result<()> {
|
|
<a href=#558 id=558 data-nosnippet>558</a>/// helper().context("Failed to complete the work")?;
|
|
<a href=#559 id=559 data-nosnippet>559</a>/// # const IGNORE: &str = stringify! {
|
|
<a href=#560 id=560 data-nosnippet>560</a>/// ...
|
|
<a href=#561 id=561 data-nosnippet>561</a>/// # };
|
|
<a href=#562 id=562 data-nosnippet>562</a>/// # unreachable!()
|
|
<a href=#563 id=563 data-nosnippet>563</a>/// }
|
|
<a href=#564 id=564 data-nosnippet>564</a>///
|
|
<a href=#565 id=565 data-nosnippet>565</a>/// fn main() {
|
|
<a href=#566 id=566 data-nosnippet>566</a>/// let err = do_it().unwrap_err();
|
|
<a href=#567 id=567 data-nosnippet>567</a>/// if let Some(e) = err.downcast_ref::<SuspiciousError>() {
|
|
<a href=#568 id=568 data-nosnippet>568</a>/// // If helper() returned SuspiciousError, this downcast will
|
|
<a href=#569 id=569 data-nosnippet>569</a>/// // correctly succeed even with the context in between.
|
|
<a href=#570 id=570 data-nosnippet>570</a>/// # return;
|
|
<a href=#571 id=571 data-nosnippet>571</a>/// }
|
|
<a href=#572 id=572 data-nosnippet>572</a>/// # panic!("expected downcast to succeed");
|
|
<a href=#573 id=573 data-nosnippet>573</a>/// }
|
|
<a href=#574 id=574 data-nosnippet>574</a>/// ```
|
|
<a href=#575 id=575 data-nosnippet>575</a>///
|
|
<a href=#576 id=576 data-nosnippet>576</a>/// - **Attaching context whose type is used in downcasts onto errors whose
|
|
<a href=#577 id=577 data-nosnippet>577</a>/// type is insignificant.**
|
|
<a href=#578 id=578 data-nosnippet>578</a>///
|
|
<a href=#579 id=579 data-nosnippet>579</a>/// Some codebases prefer to use machine-readable context to categorize
|
|
<a href=#580 id=580 data-nosnippet>580</a>/// lower level errors in a way that will be actionable to higher levels of
|
|
<a href=#581 id=581 data-nosnippet>581</a>/// the application.
|
|
<a href=#582 id=582 data-nosnippet>582</a>///
|
|
<a href=#583 id=583 data-nosnippet>583</a>/// ```
|
|
<a href=#584 id=584 data-nosnippet>584</a>/// # use anyhow::bail;
|
|
<a href=#585 id=585 data-nosnippet>585</a>/// # use thiserror::Error;
|
|
<a href=#586 id=586 data-nosnippet>586</a>/// #
|
|
<a href=#587 id=587 data-nosnippet>587</a>/// # #[derive(Error, Debug)]
|
|
<a href=#588 id=588 data-nosnippet>588</a>/// # #[error("???")]
|
|
<a href=#589 id=589 data-nosnippet>589</a>/// # struct HelperFailed;
|
|
<a href=#590 id=590 data-nosnippet>590</a>/// #
|
|
<a href=#591 id=591 data-nosnippet>591</a>/// # fn helper() -> Result<()> {
|
|
<a href=#592 id=592 data-nosnippet>592</a>/// # bail!("no such file or directory");
|
|
<a href=#593 id=593 data-nosnippet>593</a>/// # }
|
|
<a href=#594 id=594 data-nosnippet>594</a>/// #
|
|
<a href=#595 id=595 data-nosnippet>595</a>/// use anyhow::{Context, Result};
|
|
<a href=#596 id=596 data-nosnippet>596</a>///
|
|
<a href=#597 id=597 data-nosnippet>597</a>/// fn do_it() -> Result<()> {
|
|
<a href=#598 id=598 data-nosnippet>598</a>/// helper().context(HelperFailed)?;
|
|
<a href=#599 id=599 data-nosnippet>599</a>/// # const IGNORE: &str = stringify! {
|
|
<a href=#600 id=600 data-nosnippet>600</a>/// ...
|
|
<a href=#601 id=601 data-nosnippet>601</a>/// # };
|
|
<a href=#602 id=602 data-nosnippet>602</a>/// # unreachable!()
|
|
<a href=#603 id=603 data-nosnippet>603</a>/// }
|
|
<a href=#604 id=604 data-nosnippet>604</a>///
|
|
<a href=#605 id=605 data-nosnippet>605</a>/// fn main() {
|
|
<a href=#606 id=606 data-nosnippet>606</a>/// let err = do_it().unwrap_err();
|
|
<a href=#607 id=607 data-nosnippet>607</a>/// if let Some(e) = err.downcast_ref::<HelperFailed>() {
|
|
<a href=#608 id=608 data-nosnippet>608</a>/// // If helper failed, this downcast will succeed because
|
|
<a href=#609 id=609 data-nosnippet>609</a>/// // HelperFailed is the context that has been attached to
|
|
<a href=#610 id=610 data-nosnippet>610</a>/// // that error.
|
|
<a href=#611 id=611 data-nosnippet>611</a>/// # return;
|
|
<a href=#612 id=612 data-nosnippet>612</a>/// }
|
|
<a href=#613 id=613 data-nosnippet>613</a>/// # panic!("expected downcast to succeed");
|
|
<a href=#614 id=614 data-nosnippet>614</a>/// }
|
|
<a href=#615 id=615 data-nosnippet>615</a>/// ```
|
|
<a href=#616 id=616 data-nosnippet>616</a></span><span class="kw">pub trait </span>Context<T, E>: context::private::Sealed {
|
|
<a href=#617 id=617 data-nosnippet>617</a> <span class="doccomment">/// Wrap the error value with additional context.
|
|
<a href=#618 id=618 data-nosnippet>618</a> </span><span class="kw">fn </span>context<C>(<span class="self">self</span>, context: C) -> <span class="prelude-ty">Result</span><T, Error>
|
|
<a href=#619 id=619 data-nosnippet>619</a> <span class="kw">where
|
|
<a href=#620 id=620 data-nosnippet>620</a> </span>C: Display + Send + Sync + <span class="lifetime">'static</span>;
|
|
<a href=#621 id=621 data-nosnippet>621</a>
|
|
<a href=#622 id=622 data-nosnippet>622</a> <span class="doccomment">/// Wrap the error value with additional context that is evaluated lazily
|
|
<a href=#623 id=623 data-nosnippet>623</a> /// only once an error does occur.
|
|
<a href=#624 id=624 data-nosnippet>624</a> </span><span class="kw">fn </span>with_context<C, F>(<span class="self">self</span>, f: F) -> <span class="prelude-ty">Result</span><T, Error>
|
|
<a href=#625 id=625 data-nosnippet>625</a> <span class="kw">where
|
|
<a href=#626 id=626 data-nosnippet>626</a> </span>C: Display + Send + Sync + <span class="lifetime">'static</span>,
|
|
<a href=#627 id=627 data-nosnippet>627</a> F: FnOnce() -> C;
|
|
<a href=#628 id=628 data-nosnippet>628</a>}
|
|
<a href=#629 id=629 data-nosnippet>629</a>
|
|
<a href=#630 id=630 data-nosnippet>630</a><span class="doccomment">/// Equivalent to `Ok::<_, anyhow::Error>(value)`.
|
|
<a href=#631 id=631 data-nosnippet>631</a>///
|
|
<a href=#632 id=632 data-nosnippet>632</a>/// This simplifies creation of an `anyhow::Result` in places where type
|
|
<a href=#633 id=633 data-nosnippet>633</a>/// inference cannot deduce the `E` type of the result &mdash; without needing
|
|
<a href=#634 id=634 data-nosnippet>634</a>/// to write `Ok::<_, anyhow::Error>(value)`.
|
|
<a href=#635 id=635 data-nosnippet>635</a>///
|
|
<a href=#636 id=636 data-nosnippet>636</a>/// One might think that `anyhow::Result::Ok(value)` would work in such cases
|
|
<a href=#637 id=637 data-nosnippet>637</a>/// but it does not.
|
|
<a href=#638 id=638 data-nosnippet>638</a>///
|
|
<a href=#639 id=639 data-nosnippet>639</a>/// ```console
|
|
<a href=#640 id=640 data-nosnippet>640</a>/// error[E0282]: type annotations needed for `std::result::Result<i32, E>`
|
|
<a href=#641 id=641 data-nosnippet>641</a>/// --> src/main.rs:11:13
|
|
<a href=#642 id=642 data-nosnippet>642</a>/// |
|
|
<a href=#643 id=643 data-nosnippet>643</a>/// 11 | let _ = anyhow::Result::Ok(1);
|
|
<a href=#644 id=644 data-nosnippet>644</a>/// | - ^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `E` declared on the enum `Result`
|
|
<a href=#645 id=645 data-nosnippet>645</a>/// | |
|
|
<a href=#646 id=646 data-nosnippet>646</a>/// | consider giving this pattern the explicit type `std::result::Result<i32, E>`, where the type parameter `E` is specified
|
|
<a href=#647 id=647 data-nosnippet>647</a>/// ```
|
|
<a href=#648 id=648 data-nosnippet>648</a></span><span class="attr">#[allow(non_snake_case)]
|
|
<a href=#649 id=649 data-nosnippet>649</a>#[inline]
|
|
<a href=#650 id=650 data-nosnippet>650</a></span><span class="kw">pub fn </span><span class="prelude-val">Ok</span><T>(value: T) -> <span class="prelude-ty">Result</span><T> {
|
|
<a href=#651 id=651 data-nosnippet>651</a> Result::Ok(value)
|
|
<a href=#652 id=652 data-nosnippet>652</a>}
|
|
<a href=#653 id=653 data-nosnippet>653</a>
|
|
<a href=#654 id=654 data-nosnippet>654</a><span class="comment">// Not public API. Referenced by macro-generated code.
|
|
<a href=#655 id=655 data-nosnippet>655</a></span><span class="attr">#[doc(hidden)]
|
|
<a href=#656 id=656 data-nosnippet>656</a></span><span class="kw">pub mod </span>__private {
|
|
<a href=#657 id=657 data-nosnippet>657</a> <span class="kw">use </span><span class="self">self</span>::not::Bool;
|
|
<a href=#658 id=658 data-nosnippet>658</a> <span class="kw">use </span><span class="kw">crate</span>::Error;
|
|
<a href=#659 id=659 data-nosnippet>659</a> <span class="kw">use </span>alloc::fmt;
|
|
<a href=#660 id=660 data-nosnippet>660</a> <span class="kw">use </span>core::fmt::Arguments;
|
|
<a href=#661 id=661 data-nosnippet>661</a>
|
|
<a href=#662 id=662 data-nosnippet>662</a> <span class="attr">#[doc(hidden)]
|
|
<a href=#663 id=663 data-nosnippet>663</a> </span><span class="kw">pub use </span><span class="kw">crate</span>::ensure::{BothDebug, NotBothDebug};
|
|
<a href=#664 id=664 data-nosnippet>664</a> <span class="attr">#[doc(hidden)]
|
|
<a href=#665 id=665 data-nosnippet>665</a> </span><span class="kw">pub use </span>alloc::format;
|
|
<a href=#666 id=666 data-nosnippet>666</a> <span class="attr">#[doc(hidden)]
|
|
<a href=#667 id=667 data-nosnippet>667</a> </span><span class="kw">pub use </span>core::result::Result::Err;
|
|
<a href=#668 id=668 data-nosnippet>668</a> <span class="attr">#[doc(hidden)]
|
|
<a href=#669 id=669 data-nosnippet>669</a> </span><span class="kw">pub use </span>core::{concat, format_args, stringify};
|
|
<a href=#670 id=670 data-nosnippet>670</a>
|
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<a href=#671 id=671 data-nosnippet>671</a> <span class="attr">#[doc(hidden)]
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<a href=#672 id=672 data-nosnippet>672</a> </span><span class="kw">pub mod </span>kind {
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<a href=#673 id=673 data-nosnippet>673</a> <span class="attr">#[doc(hidden)]
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<a href=#674 id=674 data-nosnippet>674</a> </span><span class="kw">pub use </span><span class="kw">crate</span>::kind::{AdhocKind, TraitKind};
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<a href=#675 id=675 data-nosnippet>675</a>
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<a href=#676 id=676 data-nosnippet>676</a> <span class="attr">#[cfg(any(feature = <span class="string">"std"</span>, not(anyhow_no_core_error)))]
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<a href=#677 id=677 data-nosnippet>677</a> #[doc(hidden)]
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<a href=#678 id=678 data-nosnippet>678</a> </span><span class="kw">pub use </span><span class="kw">crate</span>::kind::BoxedKind;
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<a href=#679 id=679 data-nosnippet>679</a> }
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<a href=#680 id=680 data-nosnippet>680</a>
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<a href=#681 id=681 data-nosnippet>681</a> <span class="attr">#[doc(hidden)]
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<a href=#682 id=682 data-nosnippet>682</a> #[inline]
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<a href=#683 id=683 data-nosnippet>683</a> #[cold]
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<a href=#684 id=684 data-nosnippet>684</a> </span><span class="kw">pub fn </span>format_err(args: Arguments) -> Error {
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<a href=#685 id=685 data-nosnippet>685</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(message) = args.as_str() {
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<a href=#686 id=686 data-nosnippet>686</a> <span class="comment">// anyhow!("literal"), can downcast to &'static str
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<a href=#687 id=687 data-nosnippet>687</a> </span>Error::msg(message)
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<a href=#688 id=688 data-nosnippet>688</a> } <span class="kw">else </span>{
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<a href=#689 id=689 data-nosnippet>689</a> <span class="comment">// anyhow!("interpolate {var}"), can downcast to String
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<a href=#690 id=690 data-nosnippet>690</a> </span>Error::msg(fmt::format(args))
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<a href=#691 id=691 data-nosnippet>691</a> }
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<a href=#692 id=692 data-nosnippet>692</a> }
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<a href=#693 id=693 data-nosnippet>693</a>
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<a href=#694 id=694 data-nosnippet>694</a> <span class="attr">#[doc(hidden)]
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<a href=#695 id=695 data-nosnippet>695</a> #[inline]
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<a href=#696 id=696 data-nosnippet>696</a> #[cold]
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<a href=#697 id=697 data-nosnippet>697</a> #[must_use]
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<a href=#698 id=698 data-nosnippet>698</a> </span><span class="kw">pub fn </span>must_use(error: Error) -> Error {
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<a href=#699 id=699 data-nosnippet>699</a> error
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<a href=#700 id=700 data-nosnippet>700</a> }
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<a href=#701 id=701 data-nosnippet>701</a>
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<a href=#702 id=702 data-nosnippet>702</a> <span class="attr">#[doc(hidden)]
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<a href=#703 id=703 data-nosnippet>703</a> #[inline]
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<a href=#704 id=704 data-nosnippet>704</a> </span><span class="kw">pub fn </span>not(cond: <span class="kw">impl </span>Bool) -> bool {
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<a href=#705 id=705 data-nosnippet>705</a> cond.not()
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<a href=#706 id=706 data-nosnippet>706</a> }
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<a href=#707 id=707 data-nosnippet>707</a>
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<a href=#708 id=708 data-nosnippet>708</a> <span class="kw">mod </span>not {
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<a href=#709 id=709 data-nosnippet>709</a> <span class="attr">#[doc(hidden)]
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<a href=#710 id=710 data-nosnippet>710</a> </span><span class="kw">pub trait </span>Bool {
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<a href=#711 id=711 data-nosnippet>711</a> <span class="kw">fn </span>not(<span class="self">self</span>) -> bool;
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<a href=#712 id=712 data-nosnippet>712</a> }
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<a href=#713 id=713 data-nosnippet>713</a>
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<a href=#714 id=714 data-nosnippet>714</a> <span class="kw">impl </span>Bool <span class="kw">for </span>bool {
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<a href=#715 id=715 data-nosnippet>715</a> <span class="attr">#[inline]
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<a href=#716 id=716 data-nosnippet>716</a> </span><span class="kw">fn </span>not(<span class="self">self</span>) -> bool {
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<a href=#717 id=717 data-nosnippet>717</a> !<span class="self">self
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<a href=#718 id=718 data-nosnippet>718</a> </span>}
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<a href=#719 id=719 data-nosnippet>719</a> }
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<a href=#720 id=720 data-nosnippet>720</a>
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<a href=#721 id=721 data-nosnippet>721</a> <span class="kw">impl </span>Bool <span class="kw">for </span><span class="kw-2">&</span>bool {
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<a href=#722 id=722 data-nosnippet>722</a> <span class="attr">#[inline]
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<a href=#723 id=723 data-nosnippet>723</a> </span><span class="kw">fn </span>not(<span class="self">self</span>) -> bool {
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<a href=#724 id=724 data-nosnippet>724</a> !<span class="kw-2">*</span><span class="self">self
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<a href=#725 id=725 data-nosnippet>725</a> </span>}
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<a href=#726 id=726 data-nosnippet>726</a> }
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<a href=#727 id=727 data-nosnippet>727</a> }
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<a href=#728 id=728 data-nosnippet>728</a>}
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</code></pre></div></section></main></body></html> |