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annotate libpam-sys/libpam-sys-test/build.rs @ 131:a632a8874131

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Get all the Linux-PAM functions into libpam-sys, and get tests right.
author Paul Fisher <paul@pfish.zone>
date Wed, 02 Jul 2025 02:24:21 -0400
parents 80c07e5ab22f
children 0b6a17f8c894
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rev   line source
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1 use bindgen::MacroTypeVariation;
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2 use libpam_sys_impls::__pam_impl_enum__;
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3 use proc_macro2::{Group, Ident, TokenStream, TokenTree};
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4 use quote::{format_ident, ToTokens};
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5 use std::path::Path;
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6 use std::process::Command;
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7 use std::str::FromStr;
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8 use std::{env, fs};
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9 use syn::{Item, ItemConst};
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10
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11 // We're using the macro directly so we can match exhaustively.
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12 __pam_impl_enum__!();
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13
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14 const REDIR_FD: &str = "pam_modutil_redirect_fd";
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15
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16 fn main() {
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17 let config = match PamImpl::CURRENT {
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18 PamImpl::LinuxPam => TestConfig {
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19 headers: vec![
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20 "<security/_pam_types.h>",
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21 "<security/pam_appl.h>",
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22 "<security/pam_ext.h>",
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23 "<security/pam_modules.h>",
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24 "<security/pam_modutil.h>",
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25 ],
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26 allow_types: vec![REDIR_FD],
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27 ignore_consts: vec![
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28 "__LINUX_PAM__",
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29 "__LINUX_PAM_MINOR__",
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30 "PAM_AUTHTOK_RECOVER_ERR",
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31 ],
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32 ..Default::default()
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33 },
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34 PamImpl::OpenPam => TestConfig {
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35 headers: vec![
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36 "<security/pam_types.h>",
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37 "<security/openpam.h>",
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38 "<security/pam_appl.h>",
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39 "<security/pam_constants.h>",
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40 ],
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41 ignore_consts: vec!["OPENPAM_VERSION", "OPENPAM_RELEASE", "PAM_SOEXT"],
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42 ..Default::default()
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43 },
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44 PamImpl::Sun => TestConfig {
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45 headers: vec!["<security/pam_appl.h>", "<security/pam_modules.h>"],
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46 ..Default::default()
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47 },
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48 PamImpl::XSso => TestConfig {
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49 headers: vec!["\"xsso_pam_appl.h\""],
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50 ..Default::default()
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51 },
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52 };
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53 generate_const_test(&config);
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54 generate_ctest(&config);
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55 }
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56
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57 fn generate_const_test(config: &TestConfig) {
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58 let mut builder = bindgen::Builder::default()
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59 .header_contents("_.h", &config.header_contents())
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60 .merge_extern_blocks(true)
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61 .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
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62 .allowlist_var("(OPEN)?PAM_.*")
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63 .default_macro_constant_type(MacroTypeVariation::Signed);
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64
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65 for &typ in config.allow_types.iter() {
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66 builder = builder.allowlist_type(typ);
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67 }
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68
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69 let generated = builder.generate().unwrap();
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70 generated.write_to_file(test_file("bindgen.rs")).unwrap();
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71 let file = syn::parse_file(&generated.to_string()).unwrap();
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72 let mut tests = vec![
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73 "\
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74 #[allow(dead_code, non_camel_case_types, non_upper_case_globals)]
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75 mod generated {
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76 include!(\"bindgen.rs\");
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77 }
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78 #[allow(deprecated, overflowing_literals)]
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79 fn main() {
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80 "
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81 .into(),
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82 format!(
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83 "assert_eq!(libpam_sys::PamImpl::CURRENT, libpam_sys::PamImpl::{:?});",
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84 PamImpl::CURRENT
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85 ),
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86 ];
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87 tests.extend(
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88 file.items
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89 .iter()
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90 .filter_map(|item| {
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91 if let Item::Const(item) = item {
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92 Some(item)
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93 } else {
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94 None
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95 }
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96 })
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97 .filter(|&item| config.should_check_const(item))
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98 .map(|item| {
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99 let name = item.ident.to_string();
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100 if let Some(stripped) = name.strip_prefix(&format!("{REDIR_FD}_")) {
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101 format!("assert_eq!(generated::{name} as i32, libpam_sys::{REDIR_FD}::{stripped}.into());")
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102 } else {
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103 format!("assert_eq!(generated::{name}, libpam_sys::{name});")
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104 }
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105 }),
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106 );
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107 tests.push("}".into());
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108 let const_test = test_file("constant_test.rs");
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109 fs::write(&const_test, tests.join("\n")).unwrap();
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110 rustfmt(&const_test);
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111 }
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112
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113 fn generate_ctest(config: &TestConfig) {
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114 let mut test = ctest::TestGenerator::new();
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115 test.cfg("_hack_impl", Some(&format!("{:?}", PamImpl::CURRENT)));
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116
131
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117 for &header in config.headers.iter() {
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118 if header.starts_with('"') {
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119 test.include(env::var("CARGO_MANIFEST_DIR").unwrap());
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120 }
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121 test.header(&header[1..header.len() - 1]);
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122 }
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123 // These are opaque structs.
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124 test.skip_struct(|name| matches!(name, "pam_handle" | "AppData"));
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125 test.skip_type(|name| matches!(name, "ConversationCallback" | "CleanupCallback"));
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126 test.type_name(|name, is_struct, is_union| {
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127 assert!(!is_union); // we scabbin'
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128 match (name, is_struct) {
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129 ("AppData", _) => "void".into(),
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130 (REDIR_FD, _) => format!("enum {REDIR_FD}"),
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131 ("passwd", _) => "struct passwd".into(),
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132 ("group", _) => "struct group".into(),
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133 ("spwd", _) => "struct spwd".into(),
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134 (name, true) => format!("struct {name}"),
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135 (other, false) => other.into(),
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136 }
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137 });
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138
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139 //
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140 // Welcome to THE HACK ZONE.
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141 //
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142
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143 // Define away constness because the various PAM implementations
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144 // have different const annotations and this will surely drive you crazy.
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145 test.define("const", Some(""));
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146
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147 // Also replace all the `const`s with `mut`s in the ffi.rs file.
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148 let file_contents = include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/../src/ffi.rs"));
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149 let deconsted_file = test_file("ffi.rs");
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150 remove_consts(file_contents, &deconsted_file);
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151
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152 test.generate(&deconsted_file, "ctest.rs");
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153 }
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154
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155 fn remove_consts(file_contents: &str, out_file: impl AsRef<Path>) {
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156 let deconstified = deconstify(
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157 TokenStream::from_str(file_contents).unwrap(),
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158 &format_ident!("mut"),
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159 )
127
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160 .to_string();
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161 let out_file = out_file.as_ref();
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162 fs::write(out_file, deconstified).unwrap();
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163 rustfmt(out_file)
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164 }
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165
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166 fn rustfmt(file: impl AsRef<Path>) {
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167 let status = Command::new(env!("CARGO"))
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168 .args(["fmt", "--", file.as_ref().to_str().unwrap()])
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169 .status()
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170 .unwrap();
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171 assert!(status.success(), "rustfmt exited with code {status}");
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172 }
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173
130
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174 fn deconstify(stream: TokenStream, mut_token: &Ident) -> TokenStream {
127
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175 TokenStream::from_iter(stream.into_iter().map(|token| {
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176 match token {
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177 TokenTree::Group(g) => {
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178 TokenTree::Group(Group::new(g.delimiter(), deconstify(g.stream(), mut_token)))
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179 .into_token_stream()
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180 }
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181 TokenTree::Ident(id) if id == "const" => mut_token.into_token_stream(),
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182 other => other.into_token_stream(),
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183 }
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184 }))
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185 }
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186
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187 fn test_file(name: impl AsRef<str>) -> String {
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188 format!("{}/{}", env::var("OUT_DIR").unwrap(), name.as_ref())
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189 }
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190
121
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191 #[derive(Default)]
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192 struct TestConfig {
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193 headers: Vec<&'static str>,
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194 allow_types: Vec<&'static str>,
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195 ignore_consts: Vec<&'static str>,
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196 }
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197
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198 impl TestConfig {
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199 fn header_contents(&self) -> String {
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200 let vec: Vec<_> = self
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201 .headers
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202 .iter()
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203 .map(|h| format!("#include {h}\n"))
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204 .collect();
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205 vec.join("")
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206 }
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207
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208 fn should_check_const(&self, item: &ItemConst) -> bool {
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209 !self
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210 .ignore_consts
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211 .contains(&item.ident.to_string().as_ref())
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212 }
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213 }