patch 8.1.1591: on error garbage collection may free memory in use
Problem: On error garbage collection may free memory in use.
Solution: Reset may_garbage_collect when evaluating expression mapping.
Add tests. (Ozaki Kiichi, closes #4579)
diff --git a/src/testdir/test_vimscript.vim b/src/testdir/test_vimscript.vim
index 328d19f..bf3e052 100644
--- a/src/testdir/test_vimscript.vim
+++ b/src/testdir/test_vimscript.vim
@@ -1665,7 +1665,7 @@
delfunc DictFunc
endfunc
-func! Test_funccall_garbage_collect()
+func Test_funccall_garbage_collect()
func Func(x, ...)
call add(a:x, a:000)
endfunc