add test to verify that #132391 can be closed

Author: jdonszelmann

compiler/rustc_attr_parsing/src/parser.rs

@@ -427,10 +427,9 @@ impl<'a> MetaItemListParserContext<'a> {
                 let span = span.with_hi(segments.last().unwrap().span.hi());
                 Some(AttrPath { segments: segments.into_boxed_slice(), span })
             }
-            TokenTree::Token(
-                Token { kind: token::OpenDelim(_) | token::CloseDelim(_), .. },
-                _,
-            ) => None,
+            TokenTree::Token(Token { kind: token::OpenDelim(_) | token::CloseDelim(_), .. }, _) => {
+                None
+            }
             _ => {
                 // malformed attributes can get here. We can't crash, but somewhere else should've
                 // already warned for this.

compiler/rustc_hir/src/stable_hash_impls.rs

@@ -10,7 +10,11 @@ use crate::hir_id::{HirId, ItemLocalId};
 /// Requirements for a `StableHashingContext` to be used in this crate.
 /// This is a hack to allow using the `HashStable_Generic` derive macro
 /// instead of implementing everything in `rustc_middle`.
-pub trait HashStableContext: rustc_attr_data_structures::HashStableContext + rustc_ast::HashStableContext + rustc_abi::HashStableContext {
+pub trait HashStableContext:
+    rustc_attr_data_structures::HashStableContext
+    + rustc_ast::HashStableContext
+    + rustc_abi::HashStableContext
+{
     fn hash_attr_id(&mut self, id: &HashIgnoredAttrId, hasher: &mut StableHasher);
 }
 

tests/ui/attributes/malformed-fn-align.rs

@@ -0,0 +1,7 @@
+#![feature(fn_align)]
+#![crate_type = "lib"]
+
+trait MyTrait {
+    #[repr(align)] //~ ERROR invalid `repr(align)` attribute: `align` needs an argument
+    fn myfun();
+}

tests/ui/attributes/malformed-fn-align.stderr

@@ -0,0 +1,9 @@
+error[E0589]: invalid `repr(align)` attribute: `align` needs an argument
+  --> $DIR/malformed-fn-align.rs:5:12
+   |
+LL |     #[repr(align)]
+   |            ^^^^^ help: supply an argument here: `align(...)`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0589`.