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[SR-1512] Assertion failure: "Already marked as a fixed binding" when implementing index(_:offsetBy:limit:) #44121

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karwa opened this issue May 13, 2016 · 1 comment
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[SR-1512] Assertion failure: "Already marked as a fixed binding" when implementing index(_:offsetBy:limit:) #44121

karwa opened this issue May 13, 2016 · 1 comment
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@rudkx
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software type checker Area → compiler: Semantic analysis

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@karwa
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karwa commented May 13, 2016

Previous ID SR-1512
Radar None
Original Reporter @karwa
Type Bug
Status Resolved
Resolution Done

Attachment: Download

Environment

Swift version 3.0-dev (LLVM 752e1430fc, Clang 1e6cba3ce3, Swift ad34f89)
Target: x86_64-apple-macosx10.9

On 10.11.4, trying to compile in Xcode or manually with command:
xcrun --toolchain swift3dev -sdk macosx swift test.swift

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, CompilerCrash, TypeChecker
Assignee @rudkx
Priority Medium

md5: 538ac21c4c0d1177c701d3635c827a82

is duplicated by:

  • SR-1902 Computed getter type inference bug
  • SR-2635 Crash with Xcode 8 Swift compiler
  • SR-2766 Segmentation fault on optional multiplication
  • SR-2852 String interpolation causes segmentation fault

Issue Description:

See attached code sample. Causes an assertion failure every time.

Commenting out the function: `public func index(_ idx: C.Index, offsetBy offset: C.IndexDistance, limitedBy limit: C.Index? = nil) -> C.Index` resolves the assertion failure.

My idea was that implementing this method may allow the compiler to emit more efficient calls when using WrappedCollection to wrap a RandomAccessCollection (as it would know the exact type of C). I don't know if that's true or not, but we shouldn't hit an assertion failure in any case.
@DougGregor
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b295106

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@AnthonyLatsis AnthonyLatsis added the crash Bug: A crash, i.e., an abnormal termination of software label Dec 12, 2022
This issue was closed.
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@rudkx rudkx

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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software type checker Area → compiler: Semantic analysis
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@DougGregor @karwa @AnthonyLatsis