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annotate libpam-sys/libpam-sys-test/build.rs @ 138:999bf07efbcb

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Get rid of num_enum dependency in `libpam-sys-helpers`. Build times now fast!
author Paul Fisher <paul@pfish.zone>
date Thu, 03 Jul 2025 20:55:40 -0400
parents 88627c057709
children 33b9622ed6d2
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1 use bindgen::MacroTypeVariation;
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2 use libpam_sys_helpers::pam_impl::PamImpl;
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3 use libpam_sys_helpers::{pam_impl, pam_impl_name};
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4 use proc_macro2::{Group, Ident, TokenStream, TokenTree};
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5 use quote::{format_ident, ToTokens};
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6 use std::path::Path;
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7 use std::process::Command;
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8 use std::str::FromStr;
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9 use std::{env, fs};
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10 use syn::{Item, ItemConst};
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11
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12 const REDIR_FD: &str = "pam_modutil_redirect_fd";
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13
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14 fn main() {
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15 pam_impl::enable_pam_impl_cfg();
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16 let config = match PamImpl::CURRENT {
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17 PamImpl::LinuxPam => TestConfig {
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18 headers: vec![
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19 "<security/_pam_types.h>",
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20 "<security/pam_appl.h>",
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21 "<security/pam_ext.h>",
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22 "<security/pam_modules.h>",
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23 "<security/pam_modutil.h>",
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24 ],
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25 allow_types: vec![REDIR_FD],
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26 ignore_consts: vec![
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27 "__LINUX_PAM__",
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28 "__LINUX_PAM_MINOR__",
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29 "PAM_AUTHTOK_RECOVER_ERR",
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30 ],
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31 ..Default::default()
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32 },
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33 PamImpl::OpenPam => TestConfig {
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34 headers: vec![
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35 "<security/pam_types.h>",
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36 "<security/openpam.h>",
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37 "<security/pam_appl.h>",
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38 "<security/pam_constants.h>",
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39 ],
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40 ignore_consts: vec!["OPENPAM_VERSION", "OPENPAM_RELEASE", "PAM_SOEXT"],
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41 ..Default::default()
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42 },
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43 PamImpl::Sun => TestConfig {
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44 headers: vec![
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45 "<security/pam_appl.h>",
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46 "<security/pam_modules.h>",
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47 "\"illumos_pam_impl.h\"",
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48 ],
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49 ..Default::default()
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50 },
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51 PamImpl::XSso => TestConfig {
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52 headers: vec!["\"xsso_pam_appl.h\""],
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53 ..Default::default()
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54 },
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55 other => panic!("PAM implementation {other:?} is not yet tested"),
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56 };
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57 generate_const_test(&config);
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58 generate_ctest(&config);
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59 }
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60
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61 fn generate_const_test(config: &TestConfig) {
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62 let mut builder = bindgen::Builder::default()
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63 .header_contents("_.h", &config.header_contents())
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64 .merge_extern_blocks(true)
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65 .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
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66 .allowlist_var("(OPEN)?PAM_.*")
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67 .default_macro_constant_type(MacroTypeVariation::Signed);
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68
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69 for &typ in config.allow_types.iter() {
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70 builder = builder.allowlist_type(typ);
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71 }
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72
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73 let generated = builder.generate().unwrap();
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74 generated.write_to_file(test_file("bindgen.rs")).unwrap();
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75 let file = syn::parse_file(&generated.to_string()).unwrap();
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76 let mut tests = vec![
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77 "#[allow(deprecated, overflowing_literals)]".into(),
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78 "fn main() {".into(),
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79 format!(
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80 "assert_eq!(libpam_sys::pam_impl::PamImpl::CURRENT, libpam_sys::pam_impl::PamImpl::{:?});",
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81 PamImpl::CURRENT
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82 ),
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83 ];
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84 tests.extend(
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85 file.items
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86 .iter()
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87 .filter_map(|item| {
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88 if let Item::Const(item) = item {
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89 Some(item)
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90 } else {
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91 None
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92 }
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93 })
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94 .filter(|&item| config.should_check_const(item))
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95 .map(|item| {
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96 let name = item.ident.to_string();
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97 if let Some(stripped) = name.strip_prefix(&format!("{REDIR_FD}_")) {
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98 format!("assert_eq!(generated::{name} as i32, libpam_sys::{REDIR_FD}::{stripped}.into());");
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99 format!("assert_eq!((generated::{name} as i32).try_into(), Ok(libpam_sys::{REDIR_FD}::{stripped}));")
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100 } else {
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101 format!("assert_eq!(generated::{name} as i32, libpam_sys::{name});")
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102 }
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103 }),
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104 );
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105 tests.push("}".into());
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106 let const_test = test_file("constant_test.rs");
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107 fs::write(&const_test, tests.join("\n")).unwrap();
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108 rustfmt(&const_test);
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109 }
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110
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111 fn generate_ctest(config: &TestConfig) {
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112 let mut test = ctest::TestGenerator::new();
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113 test.cfg("pam_impl", Some(pam_impl_name!()));
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114
131
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115 for &header in config.headers.iter() {
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116 if header.starts_with('"') {
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117 test.include(env::var("CARGO_MANIFEST_DIR").unwrap());
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118 }
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119 test.header(&header[1..header.len() - 1]);
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120 }
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121 // These are opaque structs.
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122 test.skip_struct(|name| matches!(name, "pam_handle" | "AppData"));
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123 test.skip_type(|name| matches!(name, "ConversationCallback" | "CleanupCallback"));
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124 test.type_name(|name, is_struct, is_union| {
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125 assert!(!is_union); // we scabbin'
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126 match (name, is_struct) {
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127 ("AppData", _) => "void".into(),
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128 (REDIR_FD, _) => format!("enum {REDIR_FD}"),
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129 ("passwd", _) => "struct passwd".into(),
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130 ("group", _) => "struct group".into(),
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131 ("spwd", _) => "struct spwd".into(),
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132 (name, true) => format!("struct {name}"),
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133 (other, false) => other.into(),
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134 }
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135 });
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136 test.field_name(|_, name| {
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137 match name {
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138 "type_" => "type",
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139 other => other,
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140 }
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141 .into()
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142 });
127
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143
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144 //
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145 // Welcome to THE HACK ZONE.
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146 //
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147
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148 // Define away constness because the various PAM implementations
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149 // have different const annotations and this will surely drive you crazy.
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150 test.define("const", Some(""));
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151
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152 // Also replace all the `const`s with `mut`s in the ffi.rs file.
136
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153 let file_contents = include_str!("../src/lib.rs");
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154 let deconsted_file = test_file("ffi.rs");
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155 remove_consts(file_contents, &deconsted_file);
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156
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157 test.generate(&deconsted_file, "ctest.rs");
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158 }
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159
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160 fn remove_consts(file_contents: &str, out_file: impl AsRef<Path>) {
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161 let deconstified = deconstify(
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162 TokenStream::from_str(file_contents).unwrap(),
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163 &format_ident!("mut"),
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164 )
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165 .to_string();
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166 let out_file = out_file.as_ref();
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167 fs::write(out_file, deconstified).unwrap();
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168 rustfmt(out_file)
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169 }
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170
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171 fn rustfmt(file: impl AsRef<Path>) {
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172 let status = Command::new(env!("CARGO"))
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173 .args(["fmt", "--", file.as_ref().to_str().unwrap()])
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174 .status()
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175 .unwrap();
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176 assert!(status.success(), "rustfmt exited with code {status}");
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177 }
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178
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179 fn deconstify(stream: TokenStream, mut_token: &Ident) -> TokenStream {
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180 TokenStream::from_iter(stream.into_iter().map(|token| {
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181 match token {
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182 TokenTree::Group(g) => {
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183 TokenTree::Group(Group::new(g.delimiter(), deconstify(g.stream(), mut_token)))
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184 .into_token_stream()
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185 }
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186 TokenTree::Ident(id) if id == "const" => mut_token.into_token_stream(),
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187 other => other.into_token_stream(),
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188 }
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189 }))
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190 }
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191
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192 fn test_file(name: impl AsRef<str>) -> String {
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193 format!("{}/{}", env::var("OUT_DIR").unwrap(), name.as_ref())
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194 }
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195
121
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196 #[derive(Default)]
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197 struct TestConfig {
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198 headers: Vec<&'static str>,
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199 allow_types: Vec<&'static str>,
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200 ignore_consts: Vec<&'static str>,
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201 }
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202
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203 impl TestConfig {
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204 fn header_contents(&self) -> String {
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205 let vec: Vec<_> = self
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206 .headers
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207 .iter()
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208 .map(|h| format!("#include {h}\n"))
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209 .collect();
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210 vec.join("")
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211 }
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212
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213 fn should_check_const(&self, item: &ItemConst) -> bool {
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214 !self
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215 .ignore_consts
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216 .contains(&item.ident.to_string().as_ref())
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217 }
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218 }