--- /dev/null
+# -*- perl -*-
+use strict;
+use warnings;
+use tests::tests;
+check_expected ([<<'EOF', <<'EOF']);
+(write-bad-ptr) begin
+(write-bad-ptr) open "sample.txt"
+(write-bad-ptr) end
+write-bad-ptr: exit(0)
+EOF
+(write-bad-ptr) begin
+(write-bad-ptr) open "sample.txt"
+write-bad-ptr: exit(-1)
+EOF