patch 7.4.2235
Problem: submatch() does not check for a valid argument.
Solution: Give an error if the argument is out of range. (Dominique Pelle)
diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index 7681125..b23b449 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -198,6 +198,11 @@
call assert_equal('--', substitute('xxx', 'x*', {-> '-' . Recurse() . '-'}, ''))
endfunc
+func Test_invalid_submatch()
+ " This was causing invalid memory access in Vim-7.4.2232 and older
+ call assert_fails("call substitute('x', '.', {-> submatch(10)}, '')", 'E935:')
+endfunc
+
func Test_substitute_expr_arg()
call assert_equal('123456789-123456789=', substitute('123456789',
\ '\(.\)\(.\)\(.\)\(.\)\(.\)\(.\)\(.\)\(.\)\(.\)',