[146] Issue #146 - October 24, 2019

[jpsim]

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[jpsim]

Initial support for swift package manager in bazel

https://github.com/bazelbuild/rules_swift/pull/329

[fassko]

New project announcement: Swift compiler driver reimplementation in Swift

The swift-driver project is a new implementation of the Swift compiler driver that is intended to replace the existing driver with a more extensible, maintainable, and robust code base. The Swift compiler’s driver is what handles the build of a Swift module: it runs the Swift compiler frontend to compile source code to object files, the linker to link those object files into a library or executable, and so on, and contains much of the knowledge of how to produce working programs for any given platform. The driver is the main program that build systems (e.g. SwiftPM, xcodebuild, make, ninja) interact with to compile Swift code, so it is a key piece of infrastructure for building Swift code. The new swift-driver is architected as a Swift library, allowing for deeper integration with the Swift Package Manager.

https://forums.swift.org/t/new-project-announcement-swift-compiler-driver-reimplementation-in-swift/29696

https://github.com/apple/swift-driver

[fassko]

Un-gitignore CMakeCache.txt

I just lost a stupid amount of time to https://github.com/apple/swift/pull/84. Any objections to me pulling it out, so CMakeCache.txt shows up in git status by default? Individuals who want to do in-source-tree builds can still add it to their local .git/info/exclude. (I haven't seen the original contributor of that PR around in a while either.)

https://forums.swift.org/t/un-gitignore-cmakecache-txt/29712

[fassko]

Improving the representation of polymorphic interfaces in SIL with "substituted function types"

SIL has a lot of incidental complexity arising from representational issues in how we handle the types of polymorphically-callable functions such as protocol witnesses, class methods, and closures. Here is a proposed design for substituted function types, which tries to address some of these issues. ...

https://forums.swift.org/t/improving-the-representation-of-polymorphic-interfaces-in-sil-with-substituted-function-types/29711

[fassko]

https://medium.com/@ianpartridge/swift-development-in-docker-using-visual-studio-code-remote-b84d035e70db

https://forums.swift.org/t/vscode-extension/29722

[fassko]

Swift 5.1.1 is now available for download.

It is a bug-fix release that addresses a security issue on Ubuntu platforms.

https://forums.swift.org/t/swift-5-1-1-released-linux-only/29732

[BasThomas]

267 scheduled https://github.com/apple/swift-evolution/blob/master/proposals/0267-where-on-contextually-generic.md

[BasThomas]

New project announcement: Swift compiler driver reimplementation in Swift

@fassko I already included that one (last-minute!) in the previous issue 😄

[fassko]

Heads up about potential update-checkout failures for fetches from the clang, llvm, compiler-rt, libcxx, clang-tools-extra, lldb repos

After some llvm-project monorepo preparation work @dexonsmith and I did yesterday, your update-checkout fetches for https://github.com/apple/swift-{clang,llvm,compiler-rt,libcxx,clang-tools-extra,lldb} might fail with errors ...

https://forums.swift.org/t/heads-up-about-potential-update-checkout-failures-for-fetches-from-the-clang-llvm-compiler-rt-libcxx-clang-tools-extra-lldb-repos/29746

[BasThomas]

https://twitter.com/Catfish_Man/status/1183899166331662337 https://twitter.com/Catfish_Man/status/1183900410613878784

[fassko]

Discussion about Source compatibility

https://forums.swift.org/t/source-compatibility/29814

[fassko]

[Accepted] SE-0266: Synthesized Comparable conformance for enum types

The review for SE-0266 has ended and the proposal has been accepted.

The proposal was received positively, and removes boilerplate code for many common cases.

https://forums.swift.org/t/accepted-se-0266-synthesized-comparable-conformance-for-enum-types/29854

[fassko]

264 returned for revision

https://forums.swift.org/t/returned-for-revision-se-0264-standard-library-preview-package/29865

[fassko]

Starter task

SR-11619 [Compiler] Spurious error "anonymous closure argument not contained in a closure" in #if false

[fassko]

https://twitter.com/johannesweiss/status/1184572894807900160

_{Sent with GitHawk}

[fassko]

Backwards-deployable Conformances

This particular feature only applies to libraries shipped with Apple OSs, but that does include the Swift standard library, so it's relevant to the Swift Open Source project. And it does involve new syntax in the language.

https://forums.swift.org/t/backwards-deployable-conformances/29876

[BasThomas]

https://twitter.com/jckarter/status/1184904575435755520

A Swift blog post by @pyaskevich about the architectural improvements we've been making to get better type error messages: https://swift.org/blog/new-diagnostic-arch-overview/

[fassko]

The GitHub swift-specific split llvm-project repositories are now read-only

The transition to the llvm-project monorepo is happening today (LLVM monorepo transition happening on Thursday, the 17th of October).

https://forums.swift.org/t/the-github-swift-specific-split-llvm-project-repositories-are-now-read-only/29911

[fassko]

Swift on the Server Work Group October 8th, 2019 meeting notes

https://forums.swift.org/t/october-8th-2019/29904

[fassko]

Pitch: Add RangeSet and Related Collection Operations

Here's a pitch to fill a missing chunk of functionality in the standard library around noncontiguous ranges of elements. Please take a look at the draft proposal below, and/or try out this new functionality by using the SwiftPM package here: https://github.com/natecook1000/swift-evolution/tree/rangeset_and_friends

https://forums.swift.org/t/pitch-add-rangeset-and-related-collection-operations/29961

[fassko]

Starter task

TF-935 [Autodiff] [AD] Add -enable-experimental-forward-mode-differentiation flag

[fassko]

Trajectory for evaluating adding Automatic Differentiation to Swift

One of the efforts of the Swift for TensorFlow project has been to explore adding features like Automatic Differentiation 10 to the Swift language. This is a powerful capability that can significantly enrich Swift’s potential as a programming language for scientific computing, numerics, and machine learning.

Speaking on behalf of the Swift Core Team, we are interested in evaluating incorporating this capability directly into the Swift language.

https://forums.swift.org/t/trajectory-for-evaluating-adding-automatic-differentiation-to-swift/30048

[fassko]

SE-0267 — where clauses on contextually generic declarations

The review of SE-0267 — where clauses on contextually generic declarations begins now and runs through October 31, 2019.

https://forums.swift.org/t/se-0267-where-clauses-on-contextually-generic-declarations/30051

[fassko]

SE-0268: Refine didSet Semantics

The review of SE-0268 — Refine didSet Semantics begins now and runs through October 31, 2019.

https://forums.swift.org/t/se-0268-refine-didset-semantics/30049

[BasThomas]

Finally https://twitter.com/Catfish_Man/status/1186424549455224832

[fassko]

[Accepted] SE-0263 ‘Add a String Initializer with Access to Uninitialized Storage’

The proposal SE-0263 has been accepted.

https://forums.swift.org/t/accepted-se-0263-add-a-string-initializer-with-access-to-uninitialized-storage/30057

[fassko]

Apple’s engineering director, Josh Shaffer, gives deep dive on SwiftUI in new podcast

https://www.swiftbysundell.com/podcast/59

[fassko]

Instance-level polymorphism

I've seen some similar ideas discussed on the forums (notably Polymorphic methods in enums) which are focused around the idea of improving the experience of attaching case-specific behavior to enums without having a totally fragmented implementation. I encountered this issue yet again yesterday and wanted to solicit feedback on some thoughts I had about potential solutions.

https://forums.swift.org/t/instance-level-polymorphism/30087

[fassko]

Autolinking enabled on GitHub for bugs.swift.org issues!

https://forums.swift.org/t/autolinking-enabled-on-github-for-bugs-swift-org-issues/30091

[irshadpc]

SwiftUI Layout System: An In-Depth Look https://kean.github.io/post/swiftui-layout-system

_{Sent with GitHawk}

[BasThomas]

https://twitter.com/johannesweiss/status/1187045920409444353

🎉 Awesome! We've got the 1.0.0 tag of the async-http-client library: https://github.com/swift-server/async-http-client which means it will now follow SemVer and you can depend on it using from: "1.0.0" #SSWG This is a true community effort, please keep the patches & issues coming!

[BasThomas]

https://twitter.com/johannesweiss/status/1187072832552890368

It's release day today SwiftNIO 2.9.0 with quite a number of new features and over 20 PRs since 2.8.0: https://github.com/apple/swift-nio/releases/tag/2.9.0 🚀 https://twitter.com/johannesweiss/status/1187045920409444353