2 files changed, 30 insertions, 7 deletions

diff --git a/crates/libsyntax2/src/grammar/items/mod.rs b/crates/libsyntax2/src/grammar/items/mod.rs
index 8c19aa179..2567313ab 100644
--- a/crates/libsyntax2/src/grammar/items/mod.rs
+++ b/crates/libsyntax2/src/grammar/items/mod.rs
@@ -181,7 +181,16 @@ fn items_without_modifiers(p: &mut Parser) -> Option<SyntaxKind> {
             MODULE
         }
         STRUCT_KW => {
-            nominal::struct_def(p);
+            // test struct_items
+            // struct Foo;
+            // struct Foo {}
+            // struct Foo();
+            // struct Foo(String, usize);
+            // struct Foo {
+            //     a: i32,
+            //     b: f32,
+            // }
+            nominal::struct_def(p, STRUCT_KW);
             if p.at(SEMI) {
                 p.err_and_bump(
                     "expected item, found `;`\n\
@@ -190,6 +199,16 @@ fn items_without_modifiers(p: &mut Parser) -> Option<SyntaxKind> {
             }
             STRUCT_DEF
         }
+        IDENT if p.at_contextual_kw("union") => {
+            // test union_items
+            // union Foo {}
+            // union Foo {
+            //     a: i32,
+            //     b: f32,
+            // }
+            nominal::struct_def(p, UNION_KW);
+            STRUCT_DEF
+        }
         ENUM_KW => {
             nominal::enum_def(p);
             ENUM_DEF
diff --git a/crates/libsyntax2/src/grammar/items/nominal.rs b/crates/libsyntax2/src/grammar/items/nominal.rs
index 11c43e371..8d02ad555 100644
--- a/crates/libsyntax2/src/grammar/items/nominal.rs
+++ b/crates/libsyntax2/src/grammar/items/nominal.rs
@@ -1,8 +1,8 @@
 use super::*;
 
-pub(super) fn struct_def(p: &mut Parser) {
-    assert!(p.at(STRUCT_KW));
-    p.bump();
+pub(super) fn struct_def(p: &mut Parser, kind: SyntaxKind) {
+    assert!(p.at(STRUCT_KW) || p.at_contextual_kw("union"));
+    p.bump_remap(kind);
 
     name_r(p, ITEM_RECOVERY_SET);
     type_params::opt_type_param_list(p);
@@ -22,19 +22,23 @@ pub(super) fn struct_def(p: &mut Parser) {
                 }
             }
         }
-        SEMI => {
+        SEMI if kind == STRUCT_KW => {
             p.bump();
             return;
         }
         L_CURLY => named_field_def_list(p),
-        L_PAREN => {
+        L_PAREN if kind == STRUCT_KW => {
             pos_field_list(p);
             p.expect(SEMI);
         }
-        _ => {
+        _ if kind == STRUCT_KW => {
             p.error("expected `;`, `{`, or `(`");
             return;
         }
+        _ => {
+            p.error("expected `{`");
+            return;
+        }
     }
 }