parse/0: instruction: 1
parse/0:   ingredient: {name: "0", value: 0, type: 0, properties: [0: literal]}
parse/0:   product: {name: "_", value: 0, type: , properties: [_: ]}
parse/0:   product: {name: "x", value: 0, type: 1, properties: [x: integer]}
name/0: assign x 1
after-brace/0: recipe main
after-brace/0: copy ...
run/0: instruction main/0
run/0: ingredient 0 is 0