patch 8.2.4533: Vim9: no test that after assigning null type is still checkedv8.2.4533

Problem:    Vim9: no test that after assigning null the type is still checked.
Solution:   Add a test.

2 files changed, 27 insertions, 0 deletions

diff --git a/src/testdir/test_vim9_assign.vim b/src/testdir/test_vim9_assign.vim
index abc3a15b9..21a39e1f6 100644
--- a/src/testdir/test_vim9_assign.vim
+++ b/src/testdir/test_vim9_assign.vim
@@ -340,10 +340,35 @@ def Test_null_values()
         var j: job = null_job
         var c: channel = null_channel
       endif
+
+      var d: dict<func> = {a: function('tr'), b: null_function}
   END
   v9.CheckDefAndScriptSuccess(lines)
 enddef
 
+def Test_keep_type_after_assigning_null()
+  var lines =<< trim END
+      var b: blob
+      b = null_blob
+      b = 'text'
+  END
+  v9.CheckDefExecAndScriptFailure(lines, 'E1012: Type mismatch; expected blob but got string')
+
+  lines =<< trim END
+      var l: list<number>
+      l = null_list
+      l = ['text']
+  END
+  v9.CheckDefExecAndScriptFailure(lines, 'E1012: Type mismatch; expected list<number> but got list<string>')
+
+  lines =<< trim END
+      var d: dict<string>
+      d = null_dict
+      d = {a: 1, b: 2}
+  END
+  v9.CheckDefExecAndScriptFailure(lines, 'E1012: Type mismatch; expected dict<string> but got dict<number>')
+enddef
+
 def Test_skipped_assignment()
   var lines =<< trim END
       for x in []
diff --git a/src/version.c b/src/version.c
index 9248ca403..9b72517a5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4533,
+/**/
     4532,
 /**/
     4531,