patch 9.0.1559: function argument types not always checkedv9.0.1559

Problem:    Function argument types not always checked and using v:none may
            cause an error.
Solution:   Check argument types once the function type is known.  Do not give
            an error for using v:none as an argument. (closes #12200)

1 files changed, 32 insertions, 0 deletions

diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index ffb8de48dd..ecdbd5eaca 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -778,6 +778,38 @@ def Test_using_vnone_default()
   END
   v9.CheckScriptSuccess(lines)
 
+  lines =<< trim END
+      vim9script
+
+      export def Floats(x: float, y = 2.0, z = 5.0)
+        g:result = printf("%.2f %.2f %.2f", x, y, z)
+      enddef
+  END
+  writefile(lines, 'Xlib.vim', 'D')
+
+  # test using a function reference in script-local variable
+  lines =<< trim END
+      vim9script
+
+      import './Xlib.vim'
+      const Floatfunc = Xlib.Floats
+      Floatfunc(1.0, v:none, 3.0)
+  END
+  v9.CheckScriptSuccess(lines)
+  assert_equal('1.00 2.00 3.00', g:result)
+  unlet g:result
+
+  # test calling the imported function
+  lines =<< trim END
+      vim9script
+
+      import './Xlib.vim'
+      Xlib.Floats(1.0, v:none, 3.0)
+  END
+  v9.CheckScriptSuccess(lines)
+  assert_equal('1.00 2.00 3.00', g:result)
+  unlet g:result
+
   # TODO: this should give an error for using a missing argument
   # lines =<< trim END
   #    vim9script