def validate_whens(ctx, line_num, whens):
for when in whens:
checkF(when.lstrip('!') in ctx.all_whens, '{}: bad when: {}', line_num, when)
def validate_keys(line_num, keys):
for word in keys:
for el in word.split('+'):
checkF(key_validator.fullmatch(el), '{}: bad key: {!r}', line_num, el)
