commit e28d9b3bd4de2c7288add83ec35dc001ba280617
author Bram Moolenaar <Bram@vim.org> Sat Jul 03 18:56:53 2021 +0200
committer Bram Moolenaar <Bram@vim.org> Sat Jul 03 18:56:53 2021 +0200
tree 9703589a42e63637f98b4799da3f5d5157607d4c
parent 00aaa512d5e775e0db21e251f43d7afb8fca910f

patch 8.2.3091: Vim9: default argument expr. cannot use previous argument

Problem:    Vim9: default argument expression cannot use previous argument
Solution:   Correct argument index. (closes #8496)

src/testdir/test_vim9_func.vim

diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 4816cb6..f4142ee 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -452,6 +452,12 @@
       MyDefaultThird('->', 'xx', v:none)->assert_equal('->xxbb')
       MyDefaultThird('->', v:none, 'yy')->assert_equal('->aayy')
       MyDefaultThird('->', 'xx', 'yy')->assert_equal('->xxyy')
+
+      def DefArg(mandatory: any, optional = mandatory): string
+        return mandatory .. optional
+      enddef
+      DefArg(1234)->assert_equal('12341234')
+      DefArg("ok")->assert_equal('okok')
   END
   CheckDefAndScriptSuccess(lines)