METAR – Build Information – Swift Package Index

Build Information

Failed to build METAR, reference 2.1.1 (e3fcdf), with Swift 6.4 for macOS (SPM) on 17 Sep 2026 18:29:00 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
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Builder version: 5.1.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/JonathanDowning/SwiftMETAR.git
Reference: 2.1.1
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/JonathanDowning/SwiftMETAR
 * tag               2.1.1      -> FETCH_HEAD
HEAD is now at e3fcdf3 Improve parsing reliability (#13)
Cloned https://github.com/JonathanDowning/SwiftMETAR.git
Revision (git rev-parse @):
e3fcdf3a6ca2d2005f9646fd854f35fc5fb7de71
SUCCESS checkout https://github.com/JonathanDowning/SwiftMETAR.git at 2.1.1
========================================
Build
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Selected platform:         macosSpm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/JonathanDowning/SwiftMETAR.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64
Building for debugging...
[Planning deferred tasks]
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[20 / 29] METAR
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[65 / 74] METAR
[66 / 74] METAR
[71 / 74] METAR
error: SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/METAR/METAR+Parsing.swift failed with a nonzero exit code. Command line:     cd /Users/admin/builder
    builtin-SwiftPerFileCompile METAR+Parsing.swift
/Users/admin/builder/spi-builder-workspace/Sources/METAR/METAR+Parsing.swift:373:61: [1;31merror: [1;39mambiguous use of 'subscript(_:)'[0;0m
[0;36m371 |[0;0m         for match in metar.matches(for: #"(?<!\S)(?:(?:Q([0-9]{4}))|(?:A([0-9]{4})))\b"#).reversed() {
[0;36m372 |[0;0m             guard let range = match[0] else { continue }
[0;36m373 |[0;0m             let hPa = match[1].flatMap { Double(String(metar[$0])) }.map { Measurement(value: $0, unit: UnitPressure.hectopascals) }
    [0;36m|[0;0m                                                             `- [1;31merror: [1;39mambiguous use of 'subscript(_:)'[0;0m
[0;36m374 |[0;0m             let inHg = match[2].flatMap { Double(String(metar[$0])) }.map { Measurement(value: $0 / 100, unit: UnitPressure.inchesOfMercury) }
[0;36m375 |[0;0m             if qnh?.unit == .inchesOfMercury {
Swift.String.subscript:3:10: [1;39mnote: [1;39mfound this candidate in module 'Swift'[0;0m
[0;36m1 |[0;0m struct String {
[0;36m2 |[0;0m @available(swift 4)
[0;36m3 |[0;0m   public subscript(r: Range<String.Index>) -> Substring { get }}
  [0;36m|[0;0m          `- [1;39mnote: [1;39mfound this candidate in module 'Swift'[0;0m
[0;36m4 |[0;0m
Swift.Collection.subscript:2:19: [1;39mnote: [1;39mfound this candidate in module 'Swift'[0;0m
[0;36m1 |[0;0m protocol Collection {
[0;36m2 |[0;0m @inlinable public subscript<R>(r: R) -> Self.SubSequence where R : RangeExpression, Self.Index == R.Bound { get }}
  [0;36m|[0;0m                   `- [1;39mnote: [1;39mfound this candidate in module 'Swift'[0;0m
[0;36m3 |[0;0m
Failed frontend command:
/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -c /Users/admin/builder/spi-builder-workspace/Sources/METAR/CloudLayer.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/DirectionalVisibility.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/FlightRules.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/METAR+Ceiling.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/METAR+Date.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/METAR+FlightRules.swift -primary-file /Users/admin/builder/spi-builder-workspace/Sources/METAR/METAR+Parsing.swift -primary-file /Users/admin/builder/spi-builder-workspace/Sources/METAR/METAR+RelativeHumidity.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/METAR.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/MilitaryColorCode.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/RunwayCondition.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/RunwayVisualRange.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/SkyCondition.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/Trend.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/Visibility.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/Weather.swift /Users/admin/builder/spi-builder-workspace/Sources/METAR/Wind.swift -emit-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR+Parsing.d -emit-const-values-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR+Parsing.swiftconstvalues -emit-reference-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR+Parsing.swiftdeps -serialize-diagnostics-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR+Parsing.dia -emit-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR+RelativeHumidity.d -emit-const-values-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR+RelativeHumidity.swiftconstvalues -emit-reference-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR+RelativeHumidity.swiftdeps -serialize-diagnostics-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR+RelativeHumidity.dia -target arm64-apple-macos12.0 -disable-cross-import-overlay-search -load-resolved-plugin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins/libFoundationMacros.dylib\#/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server\#FoundationMacros -load-resolved-plugin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins/libObservationMacros.dylib\#/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server\#ObservationMacros -load-resolved-plugin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins/libSwiftMacros.dylib\#/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server\#SwiftMacros -disable-implicit-swift-modules -Xcc -fno-implicit-modules -Xcc -fno-implicit-module-maps -explicit-swift-module-map-file /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR-dependencies-1.json -Xllvm -aarch64-use-tbi -enable-objc-interop -stack-check -sdk /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX27.0.sdk -I /Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug -Isystem /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -F /Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug -F /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -module-cache-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftExplicitPrecompiledModules -color-diagnostics -Xcc -fcolor-diagnostics -enable-testing -g -debug-info-format\=dwarf -dwarf-version\=4 -swift-version 5 -Onone -D SWIFT_PACKAGE -D DEBUG -D SWIFT_MODULE_RESOURCE_BUNDLE_UNAVAILABLE -D Xcode -serialize-debugging-options -enable-experimental-feature DebugDescriptionMacro -empty-abi-descriptor -validate-clang-modules-once -clang-build-session-file /Users/admin/builder/spi-builder-workspace/.build/out/ModuleCache.noindex/Session.modulevalidation -Xcc -working-directory -Xcc /Users/admin/builder -enable-anonymous-context-mangled-names -file-compilation-dir /Users/admin/builder -Xcc -D_LIBCPP_HARDENING_MODE\=_LIBCPP_HARDENING_MODE_DEBUG -Xcc -ivfsstatcache -Xcc /Users/admin/builder/spi-builder-workspace/.build/out/SDKStatCaches.noindex/macosx27.0-26A425-80c5bbf1d171475443272936d42f90a36a22442a12e9d48fe1a705f55a1adfc4.sdkstatcache -Xcc -fmodules-prune-interval\=86400 -Xcc -fmodules-prune-after\=345600 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug/include -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/DerivedSources-normal/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/DerivedSources/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name METAR -const-gather-protocols-file /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR_const_extract_protocols.json -disable-clang-spi -clang-target arm64-apple-macos27.0 -target-sdk-version 27.0 -target-sdk-name macosx27.0 -in-process-plugin-server-path /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/libSwiftInProcPluginServer.dylib -parse-as-library -o /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR+Parsing.o -o /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR+RelativeHumidity.o -debug-module-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR.swiftmodule -index-unit-output-path /METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR+Parsing.o -index-unit-output-path /METAR.build/Debug/METAR-t.build/Objects-normal/arm64/METAR+RelativeHumidity.o -index-store-path /Users/admin/builder/spi-builder-workspace/.build/out -index-system-modules
error: Build failed
BUILD FAILURE 6.4 macosSpm