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Designate _SendableMetatype as a marker protocol #792

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Merged
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Jul 1, 2025
Merged

Designate _SendableMetatype as a marker protocol #792

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4 changes: 2 additions & 2 deletions Sources/ArgumentParser/Utilities/SwiftExtensions.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@

#if compiler(>=6.2)
/// Designates a type as having a sendable metatype.
public protocol _SendableMetatype: SendableMetatype {}
@_marker public protocol _SendableMetatype: SendableMetatype {}
#else
public protocol _SendableMetatype {}
@_marker public protocol _SendableMetatype {}
#endif
30 changes: 30 additions & 0 deletions Tests/ArgumentParserEndToEndTests/PositionalEndToEndTests.swift
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Expand Up @@ -241,3 +241,33 @@ extension PositionalEndToEndTests {
}
}
}

// MARK: Conditional ExpressibleByArgument conformance

// Note: This retroactive conformance is a compilation test
extension Range<Int>: ArgumentParser.ExpressibleByArgument {
public init?(argument: String) {
guard let i = argument.firstIndex(of: ":"),
let low = Int(String(argument[..<i])),
let high = Int(String(argument[i...].dropFirst())),
low <= high
else { return nil }
self = low..<high
}
}

extension PositionalEndToEndTests {
struct HasRange: ParsableArguments {
@Argument var range: Range<Int>
}

func testParseCustomRangeConformance() throws {
AssertParse(HasRange.self, ["0:4"]) { args in
XCTAssertEqual(args.range, 0..<4)
}

XCTAssertThrowsError(try HasRange.parse([]))
XCTAssertThrowsError(try HasRange.parse(["1"]))
XCTAssertThrowsError(try HasRange.parse(["1:0"]))
}
}
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