The example in the doc gets another error in addition to the error which the example wants to show

[hyperkai]

*Memo:

• mypy test.py
• mypy 1.19.1
• Python 3.14.0
• Windows 11

The example in the doc gets another error in addition to the error which the example wants to show as shown below:

def foo(arg: list[int]) -> None:
    print('Items:', ', '.join(arg)) # Anther error

a = []  # Error: Need type annotation for "a"
foo(a)

error: Argument 1 to "join" of "str" has incompatible type "list[int]"; expected "Iterable[str]"

So, it should be as shown below:

def foo(arg: list[int]) -> None:
    print('Items:', ''.join(str(a) for a in arg))

a = []  # Error: Need type annotation for "a"
foo(a)

[wyattscarpenter]

I poked around on playground and was able to replicate the original issue and validate that this fixes it satisfactorily.