patch 8.2.4231: Vim9: map() gives type error when type was not declared

Problem:    Vim9: map() gives type error when type was not declared.
Solution:   Only check the type when it was declared, like extend() does.
            (closes #9635)
diff --git a/src/testdir/test_vim9_assign.vim b/src/testdir/test_vim9_assign.vim
index 7f4d87a..0af1d5b 100644
--- a/src/testdir/test_vim9_assign.vim
+++ b/src/testdir/test_vim9_assign.vim
@@ -1963,7 +1963,7 @@
       var ll: list<number>
       ll = [1, 2, 3]->map('"one"')
   END
-  CheckDefExecFailure(lines, 'E1012: Type mismatch; expected number but got string')
+  CheckDefExecFailure(lines, 'E1012: Type mismatch; expected list<number> but got list<string>')
 enddef
 
 def Test_cannot_use_let()