Update 20260630

attribute/attribute_test.mbt

@@ -4,6 +4,46 @@ let dummy_loc : @basic.Location = {
   { start: pos, end: pos }
 }
 
+///|
+test "attribute payload accepts extend soft keyword" {
+  let pos = dummy_loc.start
+  let tokens : Array[(@tokens.Token, @basic.Position, @basic.Position)] = [
+    (@tokens.Token::LPAREN, pos, pos),
+    (@tokens.Token::EXTEND, pos, pos),
+    (@tokens.Token::COMMA, pos, pos),
+    (@tokens.Token::EXTEND, pos, pos),
+    (@tokens.Token::EQUAL, pos, pos),
+    (@tokens.Token::TRUE, pos, pos),
+    (@tokens.Token::COMMA, pos, pos),
+    (@tokens.Token::EXTEND, pos, pos),
+    (@tokens.Token::LPAREN, pos, pos),
+    (@tokens.Token::EXTEND, pos, pos),
+    (@tokens.Token::RPAREN, pos, pos),
+    (@tokens.Token::COMMA, pos, pos),
+    (@tokens.Token::EXTEND, pos, pos),
+    (@tokens.Token::DOT_LIDENT("field"), pos, pos),
+    (@tokens.Token::RPAREN, pos, pos),
+    (@tokens.Token::EOF, pos, pos),
+  ]
+  try payloads(tokens, initial_pos=pos) catch {
+    _ => fail("expected extend soft keyword in attribute payload to parse")
+  } noraise {
+    props =>
+      debug_inspect(
+        props,
+        content=(
+          #|<List:
+          #|  [
+          #|    Expr(Ident(extend)),
+          #|    Labeled("extend", Bool(true)),
+          #|    Expr(Apply(extend, <List: [Expr(Ident(extend))]>)),
+          #|    Expr(Ident(extend.field)),
+          #|  ]>
+        ),
+      )
+  }
+}
+
 ///|
 test "attribute" {
   let attr = Attribute::new(loc=dummy_loc, ("qual", Some("name"), "(a,b,c)"))