8000 mypy should reject non-existent fields with dataclasses.replace · Issue #14793 · python/mypy · GitHub
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mypy should reject non-existent fields with dataclasses.replace #14793

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OlegAlexander opened this issue Feb 26, 2023 · 1 comment
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mypy should reject non-existent fields with dataclasses.replace #14793

OlegAlexander opened this issue Feb 26, 2023 · 1 comment
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feature topic-dataclasses

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@OlegAlexander
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This issue was originally reported by @LunarLanding here:

microsoft/pyright#1047

I believe mypy should reject non-existent fields when dataclasses.replace is used.

To Reproduce

from dataclasses import dataclass, replace

@dataclass(frozen=True) 
class A:
    x : int
    y : int
    
a = A(0, 1)
b = replace(a, x=1) # ok
c = replace(a, not_a_field=1) # should be: error: "A" has no attribute "not_a_field"  [attr-defined]

Mypy Playground

Expected Behavior

Error: "A" has no attribute "not_a_field" [attr-defined]

Actual Behavior

No error

Related Issue

#14525
@OlegAlexander OlegAlexander added the bug mypy got something wrong label Feb 26, 2023
@AlexWaygood AlexWaygood added feature topic-dataclasses and removed bug mypy got something wrong labels Feb 26, 2023
@AlexWaygood
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Duplicate of #5152

@AlexWaygood AlexWaygood marked this as a duplicate of #5152 Feb 26, 2023
@AlexWaygood AlexWaygood closed this as not planned Won't fix, can't repro, duplicate, stale Feb 26, 2023
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