patch 8.2.0613: Vim9: no check for space before #comment

Problem:    Vim9: no check for space before #comment.
Solution:   Add space checks.
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index a541d88..219a86f 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -1210,6 +1210,176 @@
       'vim9script',
       'hi# comment',
       ], 'E416:')
+  CheckScriptSuccess([
+      'vim9script',
+      'hi Search # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'hi Search# comment',
+      ], 'E416:')
+  CheckScriptSuccess([
+      'vim9script',
+      'hi link This Search # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'hi link This That# comment',
+      ], 'E413:')
+  CheckScriptSuccess([
+      'vim9script',
+      'hi clear This # comment',
+      'hi clear # comment',
+      ])
+  " not tested, because it doesn't give an error but a warning:
+  " hi clear This# comment',
+  CheckScriptFailure([
+      'vim9script',
+      'hi clear# comment',
+      ], 'E416:')
+
+  CheckScriptSuccess([
+      'vim9script',
+      'hi Group term=bold',
+      'match Group /todo/ # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'hi Group term=bold',
+      'match Group /todo/# comment',
+      ], 'E488:')
+  CheckScriptSuccess([
+      'vim9script',
+      'match # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'match# comment',
+      ], 'E475:')
+  CheckScriptSuccess([
+      'vim9script',
+      'match none # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'match none# comment',
+      ], 'E475:')
+
+  CheckScriptSuccess([
+      'vim9script',
+      'menutrans clear # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'menutrans clear# comment text',
+      ], 'E474:')
+
+  CheckScriptSuccess([
+      'vim9script',
+      'syntax clear # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'syntax clear# comment text',
+      ], 'E28:')
+  CheckScriptSuccess([
+      'vim9script',
+      'syntax keyword Word some',
+      'syntax clear Word # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'syntax keyword Word some',
+      'syntax clear Word# comment text',
+      ], 'E28:')
+
+  CheckScriptSuccess([
+      'vim9script',
+      'syntax list # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'syntax list# comment text',
+      ], 'E28:')
+
+  CheckScriptSuccess([
+      'vim9script',
+      'syntax match Word /pat/ oneline # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'syntax match Word /pat/ oneline# comment',
+      ], 'E475:')
+
+  CheckScriptSuccess([
+      'vim9script',
+      'syntax keyword Word word # comm[ent',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'syntax keyword Word word# comm[ent',
+      ], 'E789:')
+
+  CheckScriptSuccess([
+      'vim9script',
+      'syntax match Word /pat/ # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'syntax match Word /pat/# comment',
+      ], 'E402:')
+
+  CheckScriptSuccess([
+      'vim9script',
+      'syntax match Word /pat/ contains=Something # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'syntax match Word /pat/ contains=Something# comment',
+      ], 'E475:')
+  CheckScriptFailure([
+      'vim9script',
+      'syntax match Word /pat/ contains= # comment',
+      ], 'E406:')
+  CheckScriptFailure([
+      'vim9script',
+      'syntax match Word /pat/ contains=# comment',
+      ], 'E475:')
+
+  CheckScriptSuccess([
+      'vim9script',
+      'syntax region Word start=/pat/ end=/pat/ # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'syntax region Word start=/pat/ end=/pat/# comment',
+      ], 'E475:')
+
+  CheckScriptSuccess([
+      'vim9script',
+      'syntax sync # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'syntax sync# comment',
+      ], 'E404:')
+  CheckScriptSuccess([
+      'vim9script',
+      'syntax sync ccomment # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'syntax sync ccomment# comment',
+      ], 'E404:')
+
+  CheckScriptSuccess([
+      'vim9script',
+      'syntax cluster Some contains=Word # comment',
+      ])
+  CheckScriptFailure([
+      'vim9script',
+      'syntax cluster Some contains=Word# comment',
+      ], 'E475:')
 enddef
 
 def Test_vim9_comment_gui()