Rollup merge of rust-lang#71670 - GuillaumeGomez:enforce-codeblocks-attribute-check, r=Mark-Simulacrum

Enforce even more the code blocks attributes check through rustdoc

`rustdoc` now has a lint which allows it to warn if a code block attribute is malformated (which can end up in bad situations, even more in case of testing examples!). Now it'll fail if such a situation is encountered when testing markdown code blocks examples.

r? @Mark-Simulacrum

Author: Manishearth

src/bootstrap/builder.rs

@@ -725,7 +725,11 @@ impl<'a> Builder<'a> {
             .env("CFG_RELEASE_CHANNEL", &self.config.channel)
             .env("RUSTDOC_REAL", self.rustdoc(compiler))
             .env("RUSTDOC_CRATE_VERSION", self.rust_version())
-            .env("RUSTC_BOOTSTRAP", "1");
+            .env("RUSTC_BOOTSTRAP", "1")
+            .arg("-Winvalid_codeblock_attributes");
+        if self.config.deny_warnings {
+            cmd.arg("-Dwarnings");
+        }
 
         // Remove make-related flags that can cause jobserver problems.
         cmd.env_remove("MAKEFLAGS");
@@ -838,7 +842,7 @@ impl<'a> Builder<'a> {
         // FIXME: It might be better to use the same value for both `RUSTFLAGS` and `RUSTDOCFLAGS`,
         // but this breaks CI. At the very least, stage0 `rustdoc` needs `--cfg bootstrap`. See
         // #71458.
-        let rustdocflags = rustflags.clone();
+        let mut rustdocflags = rustflags.clone();
 
         if let Ok(s) = env::var("CARGOFLAGS") {
             cargo.args(s.split_whitespace());
@@ -1140,6 +1144,7 @@ impl<'a> Builder<'a> {
 
             if self.config.deny_warnings {
                 lint_flags.push("-Dwarnings");
+                rustdocflags.arg("-Dwarnings");
             }
 
             // FIXME(#58633) hide "unused attribute" errors in incremental
@@ -1157,6 +1162,8 @@ impl<'a> Builder<'a> {
             // are always ignored in dependencies. Eventually this should be
             // fixed via better support from Cargo.
             cargo.env("RUSTC_LINT_FLAGS", lint_flags.join(" "));
+
+            rustdocflags.arg("-Winvalid_codeblock_attributes");
         }
 
         if let Mode::Rustc | Mode::Codegen = mode {

src/librustdoc/core.rs

@@ -320,7 +320,7 @@ pub fn run_core(options: RustdocOptions) -> (clean::Crate, RenderInfo, RenderOpt
     let missing_doc_example = rustc_lint::builtin::MISSING_DOC_CODE_EXAMPLES.name;
     let private_doc_tests = rustc_lint::builtin::PRIVATE_DOC_TESTS.name;
     let no_crate_level_docs = rustc_lint::builtin::MISSING_CRATE_LEVEL_DOCS.name;
-    let invalid_codeblock_attribute_name = rustc_lint::builtin::INVALID_CODEBLOCK_ATTRIBUTES.name;
+    let invalid_codeblock_attributes_name = rustc_lint::builtin::INVALID_CODEBLOCK_ATTRIBUTES.name;
 
     // In addition to those specific lints, we also need to allow those given through
     // command line, otherwise they'll get ignored and we don't want that.
@@ -330,12 +330,12 @@ pub fn run_core(options: RustdocOptions) -> (clean::Crate, RenderInfo, RenderOpt
         missing_doc_example.to_owned(),
         private_doc_tests.to_owned(),
         no_crate_level_docs.to_owned(),
-        invalid_codeblock_attribute_name.to_owned(),
+        invalid_codeblock_attributes_name.to_owned(),
     ];
 
     let (lint_opts, lint_caps) = init_lints(allowed_lints, lint_opts, |lint| {
         if lint.name == intra_link_resolution_failure_name
-            || lint.name == invalid_codeblock_attribute_name
+            || lint.name == invalid_codeblock_attributes_name
         {
             None
         } else {

src/librustdoc/test.rs

@@ -45,14 +45,14 @@ pub struct TestOptions {
 pub fn run(options: Options) -> Result<(), String> {
     let input = config::Input::File(options.input.clone());
 
-    let invalid_codeblock_attribute_name = rustc_lint::builtin::INVALID_CODEBLOCK_ATTRIBUTES.name;
+    let invalid_codeblock_attributes_name = rustc_lint::builtin::INVALID_CODEBLOCK_ATTRIBUTES.name;
 
     // In addition to those specific lints, we also need to allow those given through
     // command line, otherwise they'll get ignored and we don't want that.
-    let allowed_lints = vec![invalid_codeblock_attribute_name.to_owned()];
+    let allowed_lints = vec![invalid_codeblock_attributes_name.to_owned()];
 
     let (lint_opts, lint_caps) = init_lints(allowed_lints, options.lint_opts.clone(), |lint| {
-        if lint.name == invalid_codeblock_attribute_name {
+        if lint.name == invalid_codeblock_attributes_name {
             None
         } else {
             Some((lint.name_lower(), lint::Allow))