May 23, 2025 · May 23, 2025
diff --git a/Lib/asyncio/tools.py b/Lib/asyncio/tools.py
    TASK = 2


 @dataclass(frozen=True)
 class CycleFoundException(Exception):
    """Raised when there is a cycle when drawing the call tree."""
    cycles: list[list[int]]
    id2name: dict[int, str]
    def __init__(
            self,
            cycles: list[list[int]],
            id2name: dict[int, str],
        ) -> None:
        super().__init__(cycles, id2name)
        self.cycles = cycles
        self.id2name = id2name



 # ─── indexing helpers ───────────────────────────────────────────
diff --git a/Misc/NEWS.d/next/Library/2025-05-22-14-12-53.gh-issue-134451.M1rD-j.rst b/Misc/NEWS.d/next/Library/2025-05-22-14-12-53.gh-issue-134451.M1rD-j.rst
 Converted ``asyncio.tools.CycleFoundException`` from dataclass to a regular exception type.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -13,11 +13,17 @@ class NodeType(Enum):
		TASK = 2


		@dataclass(frozen=True)
		class CycleFoundException(Exception):
		"""Raised when there is a cycle when drawing the call tree."""
		cycles: list[list[int]]
		id2name: dict[int, str]
		def __init__(
		self,
		cycles: list[list[int]],
		id2name: dict[int, str],
		) -> None:
		super().__init__(cycles, id2name)
		self.cycles = cycles
		self.id2name = id2name



		# ─── indexing helpers ───────────────────────────────────────────
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Converted ``asyncio.tools.CycleFoundException`` from dataclass to a regular exception type.