Apr 17, 2025 · Aug 23, 2024 · Aug 23, 2024 · Aug 24, 2024 · Aug 24, 2024 · Aug 25, 2024
diff --git a/mypy/fastparse.py b/mypy/fastparse.py
            method = "visit_" + node.__class__.__name__
            visitor = getattr(self, method)
            self.visitor_cache[typeobj] = visitor
        return visitor(node)

        try:

            return visitor(node)

        except RecursionError as e:
            # For very complex expressions it is possible to hit recursion limit
            # before reaching a leaf node.
            # E.G. x1+x2+x3+...+xn -> BinOp(left=BinOp(left=BinOp(left=...
            try:
                # But to prove that is the cause of this particular recursion error,
                # try to unparse the node
                ast3.unparse(node)
            except RecursionError:
                self.errors.report(
                    node.lineno,
                    node.col_offset,
                    "Expression too complex to parse",
                    blocker=True,
                    code=codes.MISC,
                )

                expr = TempNode(AnyType(TypeOfAny.from_error), no_rhs=True)
                self.set_line(expr, node)
                return expr

            else:
              # re-raise original recursion error if it *can* be unparsed,
              # maybe this is some other issue that shouldn't be silenced/misdirected
              raise e

    def set_line(self, node: N, n: AstNode) -> N:
        node.line = n.lineno
Original file line number	Diff line number	Diff line change
Expand Up		@@ -414,7 +414,36 @@ def visit(self, node: AST \| None) -> Any:
		method = "visit_" + node.__class__.__name__
		visitor = getattr(self, method)
		self.visitor_cache[typeobj] = visitor
		return visitor(node)

		try:

		return visitor(node)

		except RecursionError as e:
		# For very complex expressions it is possible to hit recursion limit
		# before reaching a leaf node.
		# E.G. x1+x2+x3+...+xn -> BinOp(left=BinOp(left=BinOp(left=...
		try:
		# But to prove that is the cause of this particular recursion error,
		# try to unparse the node
		ast3.unparse(node)
		except RecursionError:
		self.errors.report(
		node.lineno,
		node.col_offset,
		"Expression too complex to parse",
		blocker=True,
		code=codes.MISC,
		)

		expr = TempNode(AnyType(TypeOfAny.from_error), no_rhs=True)
		self.set_line(expr, node)
		return expr

		else:
		# re-raise original recursion error if it can be unparsed,
		# maybe this is some other issue that shouldn't be silenced/misdirected
		raise e

		def set_line(self, node: N, n: AstNode) -> N:
		node.line = n.lineno
Expand Down