ERROR: ImpossibleTypeComparison - input.hack:8:7 - Type Foo is never =string(C)
ERROR: ImpossibleTypeComparison - input.hack:12:7 - Type Foo is never =string(C)
ERROR: ImpossibleTypeComparison - input.hack:16:7 - Type Foo is never =string
ERROR: ImpossibleTypeComparison - input.hack:16:7 - Type string is never =Foo
ERROR: ImpossibleTypeComparison - input.hack:20:7 - Type string is never =Foo
