Parse correct AttrInput

1 files changed, 19 insertions, 2 deletions

diff --git a/crates/ra_parser/src/grammar/attributes.rs b/crates/ra_parser/src/grammar/attributes.rs
index 1cfd301b5..72e7717b7 100644
--- a/crates/ra_parser/src/grammar/attributes.rs
+++ b/crates/ra_parser/src/grammar/attributes.rs
@@ -22,8 +22,25 @@ fn attribute(p: &mut Parser, inner: bool) {
         p.bump(T![!]);
     }
 
-    if p.at(T!['[']) {
-        items::token_tree(p);
+    if p.eat(T!['[']) {
+        paths::use_path(p);
+
+        let is_delimiter = |p: &mut Parser| match p.current() {
+            T!['('] | T!['['] | T!['{'] => true,
+            _ => false,
+        };
+
+        if p.eat(T![=]) {
+            if expressions::literal(p).is_none() {
+                p.error("expected literal");
+            }
+        } else if is_delimiter(p) {
+            items::token_tree(p);
+        }
+
+        if !p.eat(T![']']) {
+            p.error("expected `]`");
+        }
     } else {
         p.error("expected `[`");
     }