3 files changed, 47 insertions, 23 deletions

diff --git a/src/parser/grammar/items/mod.rs b/src/parser/grammar/items/mod.rs
index 12bcf7924..037cdca53 100644
--- a/src/parser/grammar/items/mod.rs
+++ b/src/parser/grammar/items/mod.rs
@@ -149,6 +149,17 @@ fn item(p: &mut Parser) {
                 }
             }
         }
+        TRAIT_KW => {
+            traits::trait_item(p);
+            TRAIT_ITEM
+        }
+        // test auto_trait
+        // auto trait T {}
+        IDENT if p.at_contextual_kw("auto") && la == TRAIT_KW => {
+            p.bump_remap(AUTO_KW);
+            traits::trait_item(p);
+            TRAIT_ITEM
+        }
         IMPL_KW => {
             traits::impl_item(p);
             IMPL_ITEM
diff --git a/src/parser/grammar/items/traits.rs b/src/parser/grammar/items/traits.rs
index 7d657ced0..60158fe41 100644
--- a/src/parser/grammar/items/traits.rs
+++ b/src/parser/grammar/items/traits.rs
@@ -1,9 +1,16 @@
 use super::*;
 
+// test trait_item
+// trait T<U>: Hash + Clone where U: Copy {}
 pub(super) fn trait_item(p: &mut Parser) {
     assert!(p.at(TRAIT_KW));
     p.bump();
     name(p);
+    type_params::list(p);
+    if p.at(COLON) {
+        type_params::bounds(p);
+    }
+    type_params::where_clause(p);
     p.expect(L_CURLY);
     p.expect(R_CURLY);
 }
diff --git a/src/parser/grammar/type_params.rs b/src/parser/grammar/type_params.rs
index ba0d4bfe8..3648ab5f3 100644
--- a/src/parser/grammar/type_params.rs
+++ b/src/parser/grammar/type_params.rs
@@ -39,29 +39,8 @@ pub(super) fn list(p: &mut Parser) {
         assert!(p.at(IDENT));
         let m = p.start();
         p.bump();
-        if p.eat(COLON) {
-            // test type_param_bounds
-            // struct S<T: 'a + ?Sized + (Copy)>;
-            loop {
-                let has_paren = p.eat(L_PAREN);
-                p.eat(QUESTION);
-                if p.at(FOR_KW) {
-                    //TODO
-                }
-                if p.at(LIFETIME) {
-                    p.bump();
-                } else if paths::is_path_start(p) {
-                    paths::type_path(p);
-                } else {
-                    break;
-                }
-                if has_paren {
-                    p.expect(R_PAREN);
-                }
-                if !p.eat(PLUS) {
-                    break;
-                }
-            }
+        if p.at(COLON) {
+            bounds(p);
         }
         // test type_param_default
         // struct S<T = i32>;
@@ -73,6 +52,33 @@ pub(super) fn list(p: &mut Parser) {
     }
 }
 
+// test type_param_bounds
+// struct S<T: 'a + ?Sized + (Copy)>;
+pub(super) fn bounds(p: &mut Parser) {
+    assert!(p.at(COLON));
+    p.bump();
+    loop {
+        let has_paren = p.eat(L_PAREN);
+        p.eat(QUESTION);
+        if p.at(FOR_KW) {
+            //TODO
+        }
+        if p.at(LIFETIME) {
+            p.bump();
+        } else if paths::is_path_start(p) {
+            paths::type_path(p);
+        } else {
+            break;
+        }
+        if has_paren {
+            p.expect(R_PAREN);
+        }
+        if !p.eat(PLUS) {
+            break;
+        }
+    }
+}
+
 pub(super) fn where_clause(p: &mut Parser) {
     if p.at(WHERE_KW) {
         let m = p.start();