rustc: Verify #[proc_macro] is only a word

... and perform the same verification for #[proc_macro_attribute], currently
neither of these attributes take any arguments.

Closes #52273

1 files changed, 4 insertions, 4 deletions

diff --git a/src/libsyntax_ext/proc_macro_registrar.rs b/src/libsyntax_ext/proc_macro_registrar.rs
index ef29e5a6b02..261208556b5 100644
--- a/src/libsyntax_ext/proc_macro_registrar.rs
+++ b/src/libsyntax_ext/proc_macro_registrar.rs
@@ -200,8 +200,8 @@ impl<'a> CollectProcMacros<'a> {
     }
 
     fn collect_attr_proc_macro(&mut self, item: &'a ast::Item, attr: &'a ast::Attribute) {
-        if let Some(_) = attr.meta_item_list() {
-            self.handler.span_err(attr.span, "`#[proc_macro_attribute]` attribute
+        if !attr.is_word() {
+            self.handler.span_err(attr.span, "`#[proc_macro_attribute]` attribute \
                 does not take any arguments");
             return;
         }
@@ -223,8 +223,8 @@ impl<'a> CollectProcMacros<'a> {
     }
 
     fn collect_bang_proc_macro(&mut self, item: &'a ast::Item, attr: &'a ast::Attribute) {
-        if let Some(_) = attr.meta_item_list() {
-            self.handler.span_err(attr.span, "`#[proc_macro]` attribute
+        if !attr.is_word() {
+            self.handler.span_err(attr.span, "`#[proc_macro]` attribute \
                 does not take any arguments");
             return;
         }