ref_to_implicit_comma.m:008: In `test':
ref_to_implicit_comma.m:008:   error: determinism declaration not satisfied.
ref_to_implicit_comma.m:008:   Declared `det', inferred `failure'.
ref_to_implicit_comma.m:013: Attempt to define a clause for `,'/2. This is
ref_to_implicit_comma.m:013:   usually caused by inadvertently writing a period
ref_to_implicit_comma.m:013:   instead of a comma at the end of the preceding
ref_to_implicit_comma.m:013:   line.