Stack overflow found in Pylance telemetry

[rchiodo]

We're seeing this on about 50 machines:

RangeError: Maximum call stack size exceeded
at classType pyright-internal/src/analyzer/typeUtils.ts:1693:4
at classType pyright-internal/src/analyzer/enums.ts:319:41
at transformTypeForEnumMember pyright-internal/src/analyzer/enums.ts:564:17
at evaluatorInterface pyright-internal/src/analyzer/typeEvaluator.ts:5622:20
at getTypeOfMemberAccessWithBaseType pyright-internal/src/analyzer/typeEvaluator.ts:5396:27
at node pyright-internal/src/analyzer/typeEvaluator.ts:1116:49
at callback pyright-internal/src/common/timing.ts:40:19
at getTypeOfExpression pyright-internal/src/analyzer/enums.ts:382:33
at transformTypeForEnumMember pyright-internal/src/analyzer/enums.ts:564:17
at evaluatorInterface pyright-internal/src/analyzer/typeEvaluator.ts:5622:20
at getTypeOfMemberAccessWithBaseType pyright-internal/src/analyzer/typeEvaluator.ts:5396:27
at node pyright-internal/src/analyzer/typeEvaluator.ts:1116:49
at callback pyright-internal/src/common/timing.ts:40:19
at getTypeOfExpression pyright-internal/src/analyzer/enums.ts:382:33
at transformTypeForEnumMember pyright-internal/src/analyzer/enums.ts:564:17
at evaluatorInterface pyright-internal/src/analyzer/typeEvaluator.ts:5622:20
at getTypeOfMemberAccessWithBaseType pyright-internal/src/analyzer/typeEvaluator.ts:5396:27
at node pyright-internal/src/analyzer/typeEvaluator.ts:1116:49
at callback pyright-internal/src/common/timing.ts:40:19
at getTypeOfExpression pyright-internal/src/analyzer/enums.ts:382:33
at transformTypeForEnumMember pyright-internal/src/analyzer/enums.ts:564:17
at evaluatorInterface pyright-internal/src/analyzer/typeEvaluator.ts:5622:20
at getTypeOfMemberAccessWithBaseType pyright-internal/src/analyzer/typeEvaluator.ts:5396:27
at node pyright-internal/src/analyzer/typeEvaluator.ts:1116:49
at callback pyright-internal/src/common/timing.ts:40:19
at getTypeOfExpression pyright-internal/src/analyzer/enums.ts:382:33
at transformTypeForEnumMember pyright-internal/src/analyzer/enums.ts:564:17
at evaluatorInterface pyright-internal/src/analyzer/typeEvaluator.ts:5622:20

[erictraut]

When trying to find a repro case, I ran across this sample which results in a stack overflow. It's similar, but the stack crawl is a bit different.

from enum import Enum
from typing import Literal

class Foo(Enum):
    x: "Literal[Foo.x]"

Here's a sample that results in a crash and a stack crawl that looks very much like the one in the telemetry.

from __future__ import annotations
from enum import Enum
from typing import Final

class Foo(Enum):
    x: Foo.x