oplang-0.4.0.1: examples/errors/errors.op
# Should fail to compile with the following errors:
# Error: In top level: Call to undefined operator 'b'.
# Error: In definition of 'f': Call to undefined operator 'a'.
f { a }
f b
# Should fail to compile with the following errors:
# Error: In top level: Call to undefined operator 'b'.
# Error: In definition of 'f': Call to undefined operator 'a'.
f { a }
f b