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[SR-4389] Extending generic nested type in separate files fails #46968

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ffried opened this issue Mar 28, 2017 · 3 comments
Closed

[SR-4389] Extending generic nested type in separate files fails #46968

ffried opened this issue Mar 28, 2017 · 3 comments
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@slavapestov
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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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@ffried
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ffried commented Mar 28, 2017

Previous ID SR-4389
Radar None
Original Reporter @ffried
Type Bug
Status Resolved
Resolution Duplicate
Environment

Apple Swift version 3.1 (swiftlang-802.0.48 clang-802.0.38)
Target: x86_64-apple-macosx10.9

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug
Assignee @slavapestov
Priority Medium

md5: 42a378d04d904542f3c68d7e566ba2b2

duplicates:

  • SR-631 Extensions in different files do not recognize each other

relates to:

  • SR-631 Extensions in different files do not recognize each other

Issue Description:

Extending a generic nested type in a separate file fails with an error stating that the nested type isn't a member of the type it is nested in.

Example

Given the following two files:

genericSubtypesBase.swift

public struct BaseType {}

public extension BaseType {
    public struct SubType<T> {}
}

genericSubtypesExtension.swift

public extension BaseType.SubType {}

compiling them with swiftc -v genericSubtypesExtension.swift genericSubtypesBase.swift gives the following output:

Apple Swift version 3.1 (swiftlang-802.0.48 clang-802.0.38)
Target: x86_64-apple-macosx10.9
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c -primary-file genericSubtypesExtension.swift genericSubtypesBase.swift -target x86_64-apple-macosx10.9 -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -color-diagnostics -module-name main -o /var/folders/0z/101fmx1n5hl3g6l0vrn5g9qh0000gn/T/genericSubtypesExtension-14e4ba.o
genericSubtypesExtension.swift:1:27: error: 'SubType' is not a member type of 'BaseType'
public extension BaseType.SubType {}

Note
This error can also be reproduced by adding the two files to a new Framework Project in Xcode and hit Build.
@belkadan
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Probably the same as SR-631, but the "generic" might be an extra wrinkle.

@ffried
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ffried commented Mar 29, 2017

At least the workaround (to move the file defining BaseType and SubType before the one extending SubType) works in this case as well.

@slavapestov
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It's the same 😉

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

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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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@slavapestov @belkadan @ffried