patch 8.2.3308: Vim9: no runtime check for argument type with varargs only Commit: https://github.com/vim/vim/commit/6ce46b99635877fb0a17c06a6f5625fbc1ffa6f4 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Aug 7 15:35:36 2021 +0200 patch 8.2.3308: Vim9: no runtime check for argument type with varargs only Problem: Vim9: no runtime check for argument type if a function only has varargs. Solution: Also check argument types if uf_va_type is set. (closes #8715)

--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1149,6 +1149,18 @@ def Test_call_def_varargs()
       enddef
   END
   CheckScriptFailure(lines, 'E1160:')
+
+  lines =<< trim END
+      vim9script
+      def DoIt()
+        g:Later('')
+      enddef
+      defcompile
+      def g:Later(...l:  list<number>)
+      enddef
+      DoIt()
+  END
+  CheckScriptFailure(lines, 'E1013: Argument 1: type mismatch, expected number but got string')
 enddef
 
 let s:value = ''