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This feature only exists as a mechanism to suppress the warning introduced in https://github.com/swiftlang/swift/pull/75378. The RegexParser module, which is effectively part of the standard library, declares a Swift runtime symbol and as a result every build of the compiler and stdlib produces warnings which there are no plans to address. Warnings that are not going to be addressed need some way of being suppressed, and an experimental features seems like a reasonable mechanism for this one.
35 lines
1.3 KiB
Swift
35 lines
1.3 KiB
Swift
// RUN: %target-typecheck-verify-swift -enable-experimental-feature Extern -verify-additional-prefix runtime-symbols-
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// RUN: %target-typecheck-verify-swift -enable-experimental-feature Extern -enable-experimental-feature AllowRuntimeSymbolDeclarations
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// REQUIRES: swift_feature_Extern
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// REQUIRES: swift_feature_AllowRuntimeSymbolDeclarations
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@_silgen_name("foo") // expected-note {{attribute already specified here}}
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@_silgen_name("bar") // expected-error {{duplicate attribute}}
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func duplicateAsmName() {}
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// Test parser recovery by having something that
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// should parse fine.
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func somethingThatShouldParseFine() {}
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func func_with_nested__silgen_name() {
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@_silgen_name("exit") // expected-error {{attribute '_silgen_name' can only be used in a non-local scope}}
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func exit(_ code : UInt32) -> Void
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exit(0)
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}
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// Ensure that magic runtime symbol names can't be declared or defined through
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// various symbol-assigning attributes
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@_silgen_name("swift_retain") // expected-runtime-symbols-warning {{reserved}}
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func liveDangerously() {}
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@_silgen_name("swift_retain") // expected-runtime-symbols-warning {{reserved}}
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func liveRecklessly();
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@_extern(c, "swift_retain") // expected-runtime-symbols-warning {{reserved}}
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func liveEphemerally()
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@_cdecl("swift_retain") // expected-runtime-symbols-warning {{reserved}}
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func liveFrivolously() {}
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