[pencil] ignore errors for implicit function declaration
[pencil] ignore errors for implicit function declaration


Former-commit-id: f7a216a555686c5c8873c0123c96f6f1eb06d0c3
rbaghdadi/pencil-benchmark,rbaghdadi/pencil-benchmark,dividiti/pencil-benchmark,pencil-language/pencil-benchmark,dividiti/pencil-benchmark,rbaghdadi/pencil-benchmark,pencil-language/pencil-benchmark,pencil-language/pencil-benchmark,dividiti/pencil-benchmark