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[SR-11806] Protocol inheritance with associated type causes build failure based on source layout #54217

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swift-ci opened this issue Nov 19, 2019 · 4 comments
Closed

[SR-11806] Protocol inheritance with associated type causes build failure based on source layout #54217

swift-ci opened this issue Nov 19, 2019 · 4 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@swift-ci
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Previous ID SR-11806
Radar rdar://problem/57348897
Original Reporter silverhammermba (JIRA User)
Type Bug
Status Resolved
Resolution Done

Attachment: Download

Environment

Reproduced with Xcode 10.3 and 11.2 on Mac OS 10.14.6.

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

md5: f6b5244f91535b97be3e0f56a22a9ffb

Issue Description:

There seem to be four parts to this bug

  1. Protocol A has an associated type

  2. Protocol B has its own associated type and conforms to protocol A. I wrote an extension of B to implement the conformance

  3. Struct S conforms to protocol B

  4. Function F uses A's methods on S

If S and F are in the same file it builds and runs successfully. If I put S and F in different files I get compiler errors:

Type 'S' does not conform to protocol 'A'
Type 'S' does not conform to protocol 'B'

If I remove any of the above four parts, it builds successfully regardless of where I put S and F.

See attached Swift file.
@beccadax
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@swift-ci create

@CodaFi
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CodaFi commented Nov 20, 2019

I can't reproduce this with a master compiler but I can reproduce it with swiftlang-1103.0.1 clang-1103.0.17.90. silverhammermba (JIRA User) can you try a recent toolchain snapshot and let me know if it still shows up?

@swift-ci
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Comment by Maxwell Anselm (JIRA)

I tried the latest trunk development snapshot in Xcode and that fixes the build error.

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CodaFi commented Nov 21, 2019

Resolved on master.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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@beccadax @CodaFi @swift-ci