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[SR-12453] Type extensions of ambiguous types cannot be disambiguated by prefixing module name #54892

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ahoppen opened this issue Mar 30, 2020 · 3 comments
Open

[SR-12453] Type extensions of ambiguous types cannot be disambiguated by prefixing module name #54892

ahoppen opened this issue Mar 30, 2020 · 3 comments
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compiler The Swift compiler in itself improvement

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@ahoppen
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ahoppen commented Mar 30, 2020

Previous ID SR-12453
Radar rdar://problem/62201068
Original Reporter @ahoppen
Type Improvement

Attachment: Download

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Improvement
Assignee None
Priority Medium

md5: 54919e9cb62f55ccf1cd98c9c263f09d

Issue Description:

Assume I have two modules, each declaring a type:

Module A:

public struct Foo {}
Module B:

public struct Foo {}

Now in a third module I want to do the following:

Module C:

import A
import B

extension Foo {} // error: 'Type' is ambiguous for type lookup in this context

I would have expected to be able to disambiguate the type by prefixing it with the module name which I expected to work. However, it still throws an error:

Module C:

import A
import B

extension A.Foo {} // error: Use of undeclared type 'A'

Is there any particular reason why the disambiguation cannot work?
@beccadax
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@swift-ci create

@beccadax
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@ahoppen I tried to reproduce this in master with a pair of swiftinterfaces, but I couldn't. Can you provide a more complete test case? Which version did you see it in?

@ahoppen
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ahoppen commented May 17, 2020

Hi Brent, I have attached a sample project to reproduce the issue. I think I was also missing the public modifiers in the original description.

I am using the Swift that’s shipped with Xcode 11.4.1 (11E503a).

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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@beccadax @ahoppen