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annotate src/logging.rs @ 113:178310336596

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Fix up more constants, make things i32 rather than u32.
author Paul Fisher <paul@pfish.zone>
date Sun, 29 Jun 2025 03:11:33 -0400
parents e97534be35e3
children 1e11a52b4665
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1 //! PAM logging variables and macros.
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2 //!
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3 //! PAM implementations usually include the ability to log to syslog in a way
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4 //! that is associated with the log entry itself. This module defines the enums
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5 //! and macros for logging.
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6 //!
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7 //! For more details, see [`PamShared::log`](crate::PamShared::log).
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8 //!
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9 //! We can't use [the `log` crate](https://docs.rs/log) because that requires
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10 //! that any `Log` implementors be `Sync` and `Send`, and a PAM handle
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11 //! may be neither. Furthermore, PAM handles are passed to PAM modules in
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12 //! dynamic libraries, and `log` doesn't work across dynamic linking boundaries.
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13 //!
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14 //! A `PamShared` implementation may still use the `log` crate on the backend,
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15 //! and may even itself implement `log::Log`, but that interface is not exposed
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16 //! to the generic PAM user.
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17
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18 #[cfg(all(feature = "link", pam_impl = "openpam"))]
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19 mod levels {
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20 use crate::libpam::pam_ffi;
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21 pub const ERROR: i32 = pam_ffi::PAM_LOG_ERROR;
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22 pub const WARN: i32 = pam_ffi::PAM_LOG_NOTICE;
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23 pub const INFO: i32 = pam_ffi::PAM_LOG_VERBOSE;
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24 pub const DEBUG: i32 = pam_ffi::PAM_LOG_DEBUG;
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25 }
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26 #[cfg(not(all(feature = "link", pam_impl = "openpam")))]
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27 mod levels {
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28 pub const ERROR: i32 = libc::LOG_ERR;
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29 pub const WARN: i32 = libc::LOG_WARNING;
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30 pub const INFO: i32 = libc::LOG_INFO;
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31 pub const DEBUG: i32 = libc::LOG_DEBUG;
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32 }
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33
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34 /// An entry to be added to the log.
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35 ///
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36 /// The levels are in descending order of importance and correspond roughly
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37 /// to the similarly-named levels in the `log` crate.
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38 ///
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39 /// In all implementations, these are ordered such that `Error`, `Warning`,
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40 /// `Info`, and `Debug` are in ascending order.
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41 #[derive(Debug, PartialEq, Ord, PartialOrd, Eq)]
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42 #[repr(i32)]
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43 pub enum Level {
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44 Error = levels::ERROR,
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45 Warning = levels::WARN,
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46 Info = levels::INFO,
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47 Debug = levels::DEBUG,
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48 }
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49
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50 /// Here's the guts of the logger thingy. You shouldn't be using this!
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51 #[doc(hidden)]
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52 #[macro_export]
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53 macro_rules! __log_internal {
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54 ($handle:expr, $level:ident, $($arg:tt)+) => {
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55 $handle.log($crate::logging::Level::$level, &format!($($arg)+));
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56 }
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57 }
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58
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59 /// Logs a message at error level via the given PAM handle.
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60 ///
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61 /// This supports `format!`-style formatting.
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62 ///
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63 /// # Example
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64 ///
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65 /// ```no_run
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66 /// # fn _test(pam_handle: impl nonstick::PamShared) {
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67 /// # let load_error = "xxx";
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68 /// nonstick::error!(
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69 /// pam_handle,
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70 /// "error loading data from data source: {load_error}"
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71 /// );
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72 /// // Will log a message like "error loading data from data source: timed out"
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73 /// // at ERROR level on syslog.
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74 /// # }
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75 /// ```
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76 #[macro_export]
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77 macro_rules! error { ($handle:expr, $($arg:tt)+) => { $crate::__log_internal!($handle, Error, $($arg)+);}}
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78
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79 /// Logs a message at warning level via the given PAM handle.
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80 ///
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81 /// This supports `format!`-style formatting.
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82 ///
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83 /// # Example
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84 ///
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85 /// ```no_run
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86 /// # fn _test(pam_handle: impl nonstick::PamShared) {
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87 /// # let (start, finish) = (0, 0);
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88 /// nonstick::warn!(
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89 /// pam_handle,
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90 /// "loading took too long: {latency_ms} ms",
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91 /// latency_ms = start - finish
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92 /// );
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93 /// // Will log a message like "loading took too long: 495 ms"
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94 /// // at WARN level on syslog.
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95 /// # }
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96 /// ```
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97 #[macro_export]
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98 macro_rules! warn { ($handle:expr, $($arg:tt)+) => { $crate::__log_internal!($handle, Warning, $($arg)+);}}
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99
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100 /// Logs a message at info level via the given PAM handle.
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101 ///
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102 /// This supports `format!`-style formatting.
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103 ///
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104 /// # Example
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105 ///
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106 /// ```no_run
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107 /// # fn _test(pam_handle: impl nonstick::PamShared) {
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108 /// nonstick::info!(pam_handle, "using remote backend to load user data");
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109 /// // Will log a message like "using remote backend to load user data"
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110 /// // at INFO level on syslog.
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111 /// # }
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112 /// ```
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113 #[macro_export]
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114 macro_rules! info { ($handle:expr, $($arg:tt)+) => { $crate::__log_internal!($handle, Info, $($arg)+);}}
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115
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116 /// Logs a message at debug level via the given PAM handle.
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117 ///
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118 /// This level specially includes file/line/column information.
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119 /// This supports `format!`-style formatting.
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120 ///
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121 /// # Example
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122 ///
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123 /// ```no_run
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124 /// # fn _test(pam_handle: impl nonstick::PamShared) {
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125 /// # let userinfo_url = "https://zombo.com/";
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126 /// nonstick::debug!(pam_handle, "making HTTP GET request to {userinfo_url}");
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127 /// // Will log a message like
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128 /// // "pam_http/lib.rs:39:14: making HTTP GET request to https://zombo.com/"
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129 /// // at DEBUG level on syslog.
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130 /// # }
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131 /// ```
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132 #[macro_export]
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133 macro_rules! debug {($handle:expr, $($arg:tt)+) => {
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134 $crate::__log_internal!(
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135 $handle, Debug,
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136 "{}:{}:{}: {}", file!(), line!(), column!(), format_args!($($arg)+),
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137 );
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138 }}
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139
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140 #[cfg(test)]
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141 mod tests {
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142 use super::*;
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143 use regex::Regex;
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144 use std::cell::RefCell;
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145
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146 #[test]
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147 fn test_order() {
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148 assert!(Level::Error < Level::Warning);
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149 assert!(Level::Warning < Level::Info);
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150 assert!(Level::Info < Level::Debug);
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151 }
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152
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153 #[test]
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154 fn test_logging() {
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155 struct Logger(RefCell<Vec<(Level, String)>>);
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156
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157 impl Logger {
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158 fn log(&self, level: Level, text: &str) {
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159 self.0.borrow_mut().push((level, text.to_owned()))
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160 }
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161 }
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162
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163 let logger = Logger(Default::default());
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164
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165 let something = Level::Error;
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166 error!(logger, "here is another thing: {}", 99);
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167 warn!(logger, "watch out!");
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168 info!(logger, "here is some info: {info}", info = "information");
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169 debug!(logger, "here is something: {something:?}");
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170
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171 let mut logged = logger.0.into_inner();
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172
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173 let (last_level, last_string) = logged.pop().unwrap();
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174 assert_eq!(Level::Debug, last_level);
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175 let expr = Regex::new(r"^[^:]+:\d+:\d+: here is something: Error$").unwrap();
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176 assert!(
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177 expr.is_match(&last_string),
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178 "{last_string:?} did not match {expr:?}"
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179 );
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180
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181 assert_eq!(
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182 vec![
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183 (Level::Error, "here is another thing: 99".to_owned()),
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184 (Level::Warning, "watch out!".to_owned()),
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185 (Level::Info, "here is some info: information".to_owned()),
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186 ],
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187 logged
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188 );
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189 }
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190 }