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34f809055a
We previously missed diagnosing this for macro args, fixing it turned out to be a bit more source breaking than initially thought though, so downgrade to a warning until Swift 7. rdar://141963700
45 lines
1.8 KiB
Swift
45 lines
1.8 KiB
Swift
// REQUIRES: swift_swift_parser
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// RUN: %empty-directory(%t)
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// RUN: split-file --leading-lines %s %t
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// RUN: %host-build-swift -swift-version 5 -emit-library -o %t/%target-library-name(MacroPlugin) -module-name=MacroPlugin %t/MacroPlugin.swift -g -no-toolchain-stdlib-rpath
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// RUN: %target-swift-frontend -typecheck -swift-version 5 -load-plugin-library %t/%target-library-name(MacroPlugin) %t/Client.swift -module-name Client -diagnostic-style=llvm 2> %t/diags
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// RUN: %FileCheck --check-prefix=CHECK-DIAG --implicit-check-not="{{error|warning}}: " -input-file=%t/diags %s
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//--- MacroPlugin.swift
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import SwiftSyntax
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import SwiftSyntaxMacros
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public struct TrailingClosureMacro: ExpressionMacro {
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public static func expansion(
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of macro: some FreestandingMacroExpansionSyntax,
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in context: some MacroExpansionContext
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) -> ExprSyntax {
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guard let argument = macro.trailingClosure else {
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fatalError()
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}
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return "\(argument)"
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}
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}
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//--- Client.swift
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@freestanding(expression)
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macro trailingClosure<T>(_ x: T) -> T = #externalMacro(module: "MacroPlugin", type: "TrailingClosureMacro")
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class rdar138997009_Class {
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func foo() {}
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func bar() {
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// rdar://141963700 - This is downgraded to a warning for Swift 6 in the
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// expansion, and Swift 7 for the argument.
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_ = { [self] in
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_ = #trailingClosure {
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foo()
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// CHECK-DIAG: @__swiftmacro_6Client0017Clientswift_yEEFcfMX[[@LINE-3]]{{.*}}trailingClosurefMf_.swift:2:9: warning: call to method 'foo' in closure requires explicit use of 'self' to make capture semantics explicit; this is an error in the Swift 6 language mode
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// CHECK-DIAG: Client.swift:[[@LINE-2]]:9: warning: call to method 'foo' in closure requires explicit use of 'self' to make capture semantics explicit; this will be an error in a future Swift language mode
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}
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}
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}
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}
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