Add tests for custom_code_classes_in_docs feature

tests/rustdoc-ui/custom_code_classes_in_docs-warning.rs

@@ -0,0 +1,19 @@
+// This test ensures that warnings are working as expected for "custom_code_classes_in_docs"
+// feature.
+
+#![feature(custom_code_classes_in_docs)]
+#![deny(warnings)]
+#![feature(no_core)]
+#![no_core]
+
+/// ```{. class= whatever=hehe #id} } {{
+/// main;
+/// ```
+//~^^^ ERROR missing class name after `.`
+//~| ERROR missing class name after `class=`
+//~| ERROR unsupported attribute `whatever=hehe`
+//~| ERROR unsupported attribute `#id`
+//~| ERROR unexpected `}` outside attribute block (`{}`)
+//~| ERROR unclosed attribute block (`{}`): missing `}` at the end
+//~| ERROR unexpected `{` inside attribute block (`{}`)
+pub fn foo() {}

tests/rustdoc-ui/custom_code_classes_in_docs-warning.stderr

@@ -0,0 +1,65 @@
+error: missing class name after `.`
+  --> $DIR/custom_code_classes_in_docs-warning.rs:9:1
+   |
+LL | / /// ```{. class= whatever=hehe #id} } {{
+LL | | /// main;
+LL | | /// ```
+   | |_______^
+   |
+note: the lint level is defined here
+  --> $DIR/custom_code_classes_in_docs-warning.rs:5:9
+   |
+LL | #![deny(warnings)]
+   |         ^^^^^^^^
+   = note: `#[deny(rustdoc::invalid_codeblock_attributes)]` implied by `#[deny(warnings)]`
+
+error: missing class name after `class=`
+  --> $DIR/custom_code_classes_in_docs-warning.rs:9:1
+   |
+LL | / /// ```{. class= whatever=hehe #id} } {{
+LL | | /// main;
+LL | | /// ```
+   | |_______^
+
+error: unsupported attribute `whatever=hehe`
+  --> $DIR/custom_code_classes_in_docs-warning.rs:9:1
+   |
+LL | / /// ```{. class= whatever=hehe #id} } {{
+LL | | /// main;
+LL | | /// ```
+   | |_______^
+
+error: unsupported attribute `#id`
+  --> $DIR/custom_code_classes_in_docs-warning.rs:9:1
+   |
+LL | / /// ```{. class= whatever=hehe #id} } {{
+LL | | /// main;
+LL | | /// ```
+   | |_______^
+
+error: unexpected `}` outside attribute block (`{}`)
+  --> $DIR/custom_code_classes_in_docs-warning.rs:9:1
+   |
+LL | / /// ```{. class= whatever=hehe #id} } {{
+LL | | /// main;
+LL | | /// ```
+   | |_______^
+
+error: unexpected `{` inside attribute block (`{}`)
+  --> $DIR/custom_code_classes_in_docs-warning.rs:9:1
+   |
+LL | / /// ```{. class= whatever=hehe #id} } {{
+LL | | /// main;
+LL | | /// ```
+   | |_______^
+
+error: unclosed attribute block (`{}`): missing `}` at the end
+  --> $DIR/custom_code_classes_in_docs-warning.rs:9:1
+   |
+LL | / /// ```{. class= whatever=hehe #id} } {{
+LL | | /// main;
+LL | | /// ```
+   | |_______^
+
+error: aborting due to 7 previous errors
+

tests/rustdoc-ui/custom_code_classes_in_docs-warning2.rs

@@ -0,0 +1,13 @@
+// This test ensures that warnings are working as expected for "custom_code_classes_in_docs"
+// feature.
+
+#![feature(custom_code_classes_in_docs)]
+#![deny(warnings)]
+#![feature(no_core)]
+#![no_core]
+
+/// ```{class=}
+/// main;
+/// ```
+//~^^^ ERROR missing class name after `class=`
+pub fn foo() {}

tests/rustdoc-ui/custom_code_classes_in_docs-warning2.stderr

@@ -0,0 +1,17 @@
+error: missing class name after `class=`
+  --> $DIR/custom_code_classes_in_docs-warning2.rs:9:1
+   |
+LL | / /// ```{class=}
+LL | | /// main;
+LL | | /// ```
+   | |_______^
+   |
+note: the lint level is defined here
+  --> $DIR/custom_code_classes_in_docs-warning2.rs:5:9
+   |
+LL | #![deny(warnings)]
+   |         ^^^^^^^^
+   = note: `#[deny(rustdoc::invalid_codeblock_attributes)]` implied by `#[deny(warnings)]`
+
+error: aborting due to previous error
+

tests/rustdoc-ui/feature-gate-custom_code_classes_in_docs.rs

@@ -0,0 +1,5 @@
+/// ```{class=language-c}
+/// int main(void) { return 0; }
+/// ```
+//~^^^ ERROR 1:1: 3:8: custom classes in code blocks are unstable [E0658]
+pub struct Bar;

tests/rustdoc-ui/feature-gate-custom_code_classes_in_docs.stderr

@@ -0,0 +1,15 @@
+error[E0658]: custom classes in code blocks are unstable
+  --> $DIR/feature-gate-custom_code_classes_in_docs.rs:1:1
+   |
+LL | / /// ```{class=language-c}
+LL | | /// int main(void) { return 0; }
+LL | | /// ```
+   | |_______^
+   |
+   = note: see issue #79483 <https://github.com/rust-lang/rust/issues/79483> for more information
+   = help: add `#![feature(custom_code_classes_in_docs)]` to the crate attributes to enable
+   = note: found these custom classes: class=language-c
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.

tests/rustdoc-ui/issues/issue-91713.stdout

@@ -1,4 +1,5 @@
 Available passes for running rustdoc:
+check-custom-code-classes - check for custom code classes without the feature-gate enabled
 check_doc_test_visibility - run various visibility-related lints on doctests
         strip-hidden - strips all `#[doc(hidden)]` items from the output
        strip-private - strips all private items from a crate which cannot be seen externally, implies strip-priv-imports
@@ -10,6 +11,7 @@ calculate-doc-coverage - counts the number of items with and without documentati
            run-lints - runs some of rustdoc's lints
 
 Default passes for rustdoc:
+check-custom-code-classes
  collect-trait-impls
 check_doc_test_visibility
         strip-hidden  (when not --document-hidden-items)