patch 8.2.2364: Vim9: line break in lambda accesses freed memory
Problem: Vim9: line break in lambda accesses freed memory.
Solution: Make a copy of the return type. (closes #7664)
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 049532c..1ea8ac9 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1811,6 +1811,18 @@
def Test_line_continuation_in_lambda()
Line_continuation_in_lambda()->assert_equal(['D', 'C', 'B', 'A'])
+
+ var lines =<< trim END
+ vim9script
+ var res = [{n: 1, m: 2, s: 'xxx'}]
+ ->mapnew((_, v: dict<any>): string => printf('%d:%d:%s',
+ v.n,
+ v.m,
+ substitute(v.s, '.*', 'yyy', '')
+ ))
+ assert_equal(['1:2:yyy'], res)
+ END
+ CheckScriptSuccess(lines)
enddef
def Test_list_lambda()