expected word diagnostic test

Author: jdonszelmann

compiler/rustc_attr_parsing/src/attributes/codegen_attrs.rs

@@ -49,7 +49,7 @@ impl<S: Stage> SingleAttributeParser<S> for ColdParser {
 
     fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
         if !args.no_args() {
-            cx.expected_no_args(cx.attr_span);
+            cx.expected_no_args(args.span().unwrap_or(cx.attr_span));
             return None;
         };
 

compiler/rustc_attr_parsing/src/context.rs

@@ -234,9 +234,9 @@ impl<'f, 'sess: 'f, S: Stage> AcceptContext<'f, 'sess, S> {
         })
     }
 
-    pub(crate) fn expected_no_args(&self, span: Span) -> ErrorGuaranteed {
+    pub(crate) fn expected_no_args(&self, args_span: Span) -> ErrorGuaranteed {
         self.emit_err(AttributeParseError {
-            span,
+            span: args_span,
             attr_span: self.attr_span,
             template: self.template.clone(),
             attribute: self.attr_path.clone(),

compiler/rustc_parse/src/validate_attr.rs

@@ -291,6 +291,7 @@ fn emit_malformed_attribute(
             | sym::repr
             | sym::deprecated
             | sym::optimize
+            | sym::cold
     ) {
         return;
     }

tests/ui/attributes/expected-word.rs

@@ -0,0 +1,3 @@
+#[cold = true]
+//~^ ERROR malformed `cold` attribute input [E0565]
+fn main() {}

tests/ui/attributes/expected-word.stderr

@@ -0,0 +1,12 @@
+error[E0565]: malformed `cold` attribute input
+  --> $DIR/expected-word.rs:1:1
+   |
+LL | #[cold = true]
+   | ^^^^^^^------^
+   | |      |
+   | |      didn't expect any arguments here
+   | help: must be of the form: `#[cold]`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0565`.