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  1. Swift
  2. SR-2444

@escaping failing on optional blocks

          Details

          • Type: Bug
          • Status: Resolved
          • Priority: Medium
          • Resolution: Done
          • Component/s: Compiler
          • Labels:
            None
          • Environment:

            Ubuntu 16.04
            swift-master @ HEAD:a23bb43d7141599786e45a75876c995611073e45

            Description

            @escaping doesn't seem to be working on Optional block parameters.

            This is related to SR-2166, but in that case being the default @escaping a safer option than @noescape the workaround was to let it @escaping.

            swift-corelibs-libdispatch/src/swift/Private.swift:72:116: error: @escaping may only be applied to parameters of function type
public func dispatch_data_create(_ buffer: UnsafeRawPointer, _ size: Int, _ queue: DispatchQueue?, _ destructor: (@escaping () -> Void)?) -> dispatch_data_t
                                                                                                                  ~^~~~~~~~~

swift-corelibs-libdispatch/src/swift/Wrapper.swift:216:83: error: @escaping may only be applied to parameters of function type
        func setCancelHandler(qos: DispatchQoS, flags: DispatchWorkItemFlags, handler: (@escaping DispatchSourceHandler)?)
                                                                                        ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

            Expected result:

            @escaping optional blocks should compile.

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                duplicates

                Bug - A problem which impairs or prevents the functions of the product. SR-2324 Optional closure type is always considered @escaping

                • Medium - Has the potential to affect progress.
                • Resolved

                  Activity

                    People

                    • Assignee:
                      milseman Michael Ilseman
                      Reporter:
                      gonzalolarralde Gonzalo Larralde
                    • Votes:
                      1 Vote for this issue
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                      10 Start watching this issue

                      Dates

                      • Created:
                        Updated:
                        Resolved: