ERROR: NonExistentFunction - input.hack:2:5 - Function f1 is not defined
ERROR: NonExistentFunction - input.hack:6:10 - Unknown function f2
ERROR: MixedAnyArgument - input.hack:6:10 - Argument 1 of echo expects ?scalar, any provided
ERROR: NonExistentFunction - input.hack:10:5 - Function f3 is not defined