patch 8.2.1718: Vim9: :def function disallows "firstline" for no good reason
Problem: Vim9: :def function disallows "firstline" and "lastline" argument
names for no good reason.
Solution: Don't check the arguments for a :def function. (closes #6986)
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index fe7bf69..4051650 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -486,6 +486,15 @@
CheckScriptFailure(['def Func(arg: number)', 'arg = 3', 'enddef', 'defcompile'], 'E1090:')
enddef
+" These argument names are reserved in legacy functions.
+def WithReservedNames(firstline: string, lastline: string): string
+ return firstline .. lastline
+enddef
+
+def Test_argument_names()
+ assert_equal('OK', WithReservedNames('O', 'K'))
+enddef
+
def Test_call_func_defined_later()
g:DefinedLater('one')->assert_equal('one')
assert_fails('NotDefined("one")', 'E117:', '', 2, 'Test_call_func_defined_later')