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

[lorentey]

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

Attachment: Download

Environment

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) {}
  #else 
    init<S: SequenceType>(elements: S) {}
  #endif
}

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

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.

[swift-ci]

Comment by Abdullah Abanmi (JIRA)

resolved in xcode 8b6 w/ swift 3

[rudkx]

Should be fixed by 5a8950a

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