patch 8.2.1140: Vim9: return type of extend() is any
Problem: Vim9: return type of extend() is any.
Solution: Use type of the argument.
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index d7c37b1..525d46d 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -909,6 +909,15 @@
assert_equal(6, res)
enddef
+def Test_extend_return_type()
+ let l = extend([1, 2], [3])
+ let res = 0
+ for n in l
+ res += n
+ endfor
+ assert_equal(6, res)
+enddef
+
def Line_continuation_in_def(dir: string = ''): string
let path: string = empty(dir)
\ ? 'empty'