patch 9.0.0726: looping over list of lists works in script, not in function
Problem: Looping over list of lists and changing the list contents works in
Vim9 script, not in a compiled function.
Solution: Mark the loop variable final instead of const. (closes #11347)
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index 05fd2fb..a0b8352 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -2275,6 +2275,20 @@
v9.CheckDefAndScriptSuccess(lines)
enddef
+def Test_for_loop_list_of_lists()
+ # loop variable is final, not const
+ var lines =<< trim END
+ # Filter out all odd numbers in each sublist
+ var list: list<list<number>> = [[1], [1, 2], [1, 2, 3], [1, 2, 3, 4]]
+ for i in list
+ filter(i, (_, n: number): bool => n % 2 == 0)
+ endfor
+
+ assert_equal([[], [2], [2], [2, 4]], list)
+ END
+ v9.CheckDefAndScriptSuccess(lines)
+enddef
+
def Test_for_loop_with_closure()
# using the loop variable in a closure results in the last used value
var lines =<< trim END