patch 8.2.1453: Vim9: failure to compile lambda not tested

Problem:    Vim9: failure to compile lambda not tested.
Solution:   Add a test case.

Author: brammool

src/testdir/test_vim9_expr.vim

@@ -1583,6 +1583,7 @@ def Test_expr7_lambda()
   assert_equal(true, LambdaUsingArg(1)())
 
   call CheckDefFailure(["filter([1, 2], {k,v -> 1})"], 'E1069:')
+  call CheckDefFailure(["let L = {a -> a + b}"], 'E1001:')
 enddef
 
 def Test_expr7_lambda_vim9script()

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1453,
 /**/
     1452,
 /**/