1 files changed, 5 insertions, 0 deletions
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 6c0b5a2e8b1..9419b9f647e 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -243,7 +243,12 @@ type stmt = spanned<stmt_>;
 #[auto_serialize]
 enum stmt_ {
     stmt_decl(@decl, node_id),
+
+    // expr without trailing semi-colon (must have unit type):
     stmt_expr(@expr, node_id),
+
+    // expr with trailing semi-colon (may have any type):
+    stmt_semi(@expr, node_id),
 }
 
 #[auto_serialize]