--- /dev/null
+# -*- perl -*-
+use strict;
+use warnings;
+use tests::tests;
+check_expected ([<<'EOF']);
+(rox-child) begin
+(rox-child) open "child-rox"
+(rox-child) read "child-rox"
+(rox-child) write "child-rox"
+(rox-child) exec "child-rox 1"
+(child-rox) begin
+(child-rox) try to write "child-rox"
+(child-rox) try to write "child-rox"
+(child-rox) end
+child-rox: exit(12)
+(rox-child) write "child-rox"
+(rox-child) end
+rox-child: exit(0)
+EOF