Method SubScriptingOpTypeChecking

libs/wgtcc/ast.cc:272–283

    void BinaryOp::SubScriptingOpTypeChecking() {
        auto lhsType = lhs_->Type()->ToPointer();
        if (!lhsType) {
            Error(this, "an pointer expected");
        }
        if (!rhs_->Type()->IsInteger()) {
            Error(this, "the operand of [] should be intger");
        }

        // The type of [] operator is the derived type
        type_ = lhsType->Derived();
    }


    void BinaryOp::MemberRefOpTypeChecking() {