patch 8.2.2620: Vim9: Using #{ for a dictionary gives strange errors

Problem:    Vim9: Using #{ for a dictionary gives strange errors.
Solution:   Give an error when using #{ for a comment after a command.
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 9829d88..1046841 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -2159,8 +2159,10 @@
   CheckDefAndScriptSuccess(lines)
  
   # legacy syntax doesn't work
-  CheckDefFailure(["var x = #{key: 8}"], 'E1097:', 3)
-  CheckDefFailure(["var x = 'a' .. #{a: 1}"], 'E1097:', 3)
+  CheckDefFailure(["var x = #{key: 8}"], 'E1170:', 1)
+  CheckDefFailure(["var x = 'a' #{a: 1}"], 'E1170:', 1)
+  CheckDefFailure(["var x = 'a' .. #{a: 1}"], 'E1170:', 1)
+  CheckDefFailure(["var x = true ? #{a: 1}"], 'E1170:', 1)
 
   CheckDefFailure(["var x = {a:8}"], 'E1069:', 1)
   CheckDefFailure(["var x = {a : 8}"], 'E1068:', 1)