diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 584126f..7e53a28 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -872,6 +872,39 @@
       echo 'abc' isnot? 'abc'
   END
   CheckScriptFailure(lines, 'E15:')
+
+  # check white space
+  lines =<< trim END
+      vim9script
+      echo 5+6
+  END
+  CheckScriptFailure(lines, 'E1004:')
+  lines =<< trim END
+      vim9script
+      echo 5 +6
+  END
+  CheckScriptFailure(lines, 'E1004:')
+  lines =<< trim END
+      vim9script
+      echo 5+ 6
+  END
+  CheckScriptFailure(lines, 'E1004:')
+
+  lines =<< trim END
+      vim9script
+      echo 'a'..'b'
+  END
+  CheckScriptFailure(lines, 'E1004:')
+  lines =<< trim END
+      vim9script
+      echo 'a' ..'b'
+  END
+  CheckScriptFailure(lines, 'E1004:')
+  lines =<< trim END
+      vim9script
+      echo 'a'.. 'b'
+  END
+  CheckScriptFailure(lines, 'E1004:')
 enddef
 
 def Test_expr5_float()
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index f3fc4c7..d024836 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1270,7 +1270,7 @@
 def TreeWalk(dir: string): list<any>
   return readdir(dir)->map({_, val ->
             fnamemodify(dir .. '/' .. val, ':p')->isdirectory()
-               ? {val : TreeWalk(dir .. '/' .. val)}
+               ? {val: TreeWalk(dir .. '/' .. val)}
                : val
              })
 enddef