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[SR-14080] Generic property wrapper assertion failure in development snapshot #56469

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xAlien95 opened this issue Jan 21, 2021 · 3 comments
Closed

[SR-14080] Generic property wrapper assertion failure in development snapshot #56469

xAlien95 opened this issue Jan 21, 2021 · 3 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself property wrappers Feature: property wrappers

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@xAlien95
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Previous ID SR-14080
Radar rdar://70238041
Original Reporter @xAlien95
Type Bug
Status Closed
Resolution Done

Attachment: Download

Environment

Xcode 12.3 (12C33)
swift-DEVELOPMENT-SNAPSHOT-2021-01-19-a.xtoolchain
Target: x86_64-apple-darwin20.2.0

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

md5: 0c71cf519666c9a0840cc782b489aebf

Issue Description:

Consider the following code snippet:

@propertyWrapper enum A {
  var wrappedValue: Int { 0 }
}

struct S {
  @A var x = 7  // error: 'A' cannot be constructed because
                //        it has no accessible initializers
}

If we add a generic type parameter to A, in Swift 5.3 we get two errors:

@propertyWrapper enum A<T> {
  var wrappedValue: Int { 0 }
}

struct S {
  @A var x = 7  // error: 'A<T>' cannot be constructed because
                //        it has no accessible initializers
                // error: Generic parameter 'T' could not be inferred
}

With the development snapshot 2021-01-19, however, the build process fails with the following (full text attached):

Assertion failed: (0 && "Bad base type"), function getContextSubstitutions, file /Users/buildnode/jenkins/workspace/oss-swift-package-macos/swift/lib/AST/Type.cpp, line 4063.
@hborla
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hborla commented Apr 2, 2021

This should be fixed by #36611

@xAlien95
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xAlien95 commented Apr 3, 2021

Thank you! I will mark this as resolved as soon as the next development snapshot is available.

@xAlien95
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The fix is available in the 2021-04-10 development snapshot. Thank you, @hborla!

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself property wrappers Feature: property wrappers
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@xAlien95 @hborla