Method concat_tuples

mypy/checkexpr.py:3524–3529

Concatenate two fixed length tuples.

(self, left: TupleType, right: TupleType)

            return typ.copy_modified(last_known_value=LiteralType(value=value, fallback=typ))

    def concat_tuples(self, left: TupleType, right: TupleType) -> TupleType:
        """Concatenate two fixed length tuples."""
        assert not (find_unpack_in_list(left.items) and find_unpack_in_list(right.items))
        return TupleType(
            items=left.items + right.items, fallback=self.named_type("builtins.tuple")
        )

    def visit_int_expr(self, e: IntExpr) -> Type:
        """Type check an integer literal (trivial)."""