🕵️ Stack Trace Lineup

import asyncio

async def gen():
    for i in range(3):
        yield i

async def main():
    async for n in gen():
        print(n)

asyncio.run(main())

# (no error)
0
1
2

from dataclasses import dataclass, asdict

@dataclass
class User:
    name: str
    age: int

u = User("Ada", 36)
print(asdict(u))

# (no error)
{'name': 'Ada', 'age': 36}

import sys
print(sys.float_info.max > 1e308, sys.float_info.min < 1e-307)

# (no error)
True True

import asyncio

async def outer():
    async def inner():
        for i in range(3):
            yield i
    yield from inner()

async def main():
    async for n in outer():
        print(n)

asyncio.run(main())

Traceback (most recent call last):
  File "lineup.py", line 11, in <module>
    asyncio.run(main())
  File "lineup.py", line 7, in outer
    yield from inner()
TypeError: 'async_generator' object is not iterable

from typing import Self

class Node:
    def link_to(self, other: "Node") -> "Node":
        self.next = other
        return self

a = Node().link_to(Node()).link_to(Node())
print(type(a).__name__)

# (no error — fluent-chain pattern works)
Node