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[SR-2259] New "expression was too complex" error in swiftlang-800.0.41.2 (Xcode 8 beta 4) #44866

lorentey opened this issue Aug 2, 2016 · 2 comments


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@lorentey lorentey commented Aug 2, 2016

Previous ID SR-2259
Radar None
Original Reporter @lorentey
Type Bug
Status Resolved
Resolution Done

Attachment: Download


Apple Swift version 3.0 (swiftlang-800.0.41.2 clang-800.0.36)
Target: x86_64-apple-macosx10.9

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, 3.0Regression, TypeChecker
Assignee @lorentey
Priority Medium

md5: cab3005164fef8464fdf85648ba7fdfa

Issue Description:

The code below (also attached) compiles without errors under Swift 2.x and Swift 3.0 betas before the latest, beta 4:

struct Foo {
  #if swift(>=3)
    init<S: Sequence>(elements: S) {}
    init<S: SequenceType>(elements: S) {}

func test() {
  let c = 26
  let foo = Foo(elements: (0 ... 2 * c + 1).map { ($0 & ~1, String($0)) }) 

However, in the Swift 3.0 compiler that's included in Xcode 8 beta 4, line 11 produces the following error:

complex-expression.swift:11:13: error: expression was too complex to be solved in reasonable time; consider breaking up the expression into distinct sub-expressions
  let foo = Foo(elements: (0 ... 2 * c + 1).map { ($0 & ~1, String($0)) }) 

Extracting the upper bound of the closed range expression into a separate variable works around the issue.

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@swift-ci swift-ci commented Aug 16, 2016

Comment by Abdullah Abanmi (JIRA)

resolved in xcode 8b6 w/ swift 3

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@rudkx rudkx commented Aug 26, 2016

Should be fixed by 5a8950a

Please reactivate if you find that not to be the case.

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