ts ::= ws tests ws => ts
tests ::= test %% ws
ws !::= w*
-test ::= ^"testcase" "{" input output+/ws grammar "}" /ws
+test ::= ^"testcase" "{" input output $$ ws grammar "}" /ws
| ^"testcase" "{" input grammar "}" /ws
output ::= "output" quoted ";" /ws
input ::= "input" quoted ";" /ws