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https://github.com/apple/swift.git
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Aviva Ruben
73de759b9f
Add a test to try to ensure we don't break member attribute macros interaction with availability macros in the future. It would be nice to request macro expansion inside `getSemanticAvailableAttrs` but that leads to a cycle if the expansion causes availability to be checked. This test is probably insufficient, but its a start.
44 lines
1.6 KiB
Swift
44 lines
1.6 KiB
Swift
// REQUIRES: swift_swift_parser
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// RUN: %empty-directory(%t)
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// RUN: split-file %s %t
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// Build the macro plugin.
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// RUN: %host-build-swift -swift-version 5 -emit-library -o %t/%target-library-name(MacroDefinition) -module-name=MacroDefinition %t/macro.swift -g -no-toolchain-stdlib-rpath
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// RUN: %target-swift-frontend -typecheck -verify -swift-version 5 -load-plugin-library %t/%target-library-name(MacroDefinition) %t/test.swift
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//--- macro.swift
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import SwiftSyntax
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import SwiftSyntaxMacros
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/// Attaches `@available(*, unavailable)` to every member of the annotated type.
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public struct UnavailableMembersMacro: MemberAttributeMacro {
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public static func expansion(
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of node: AttributeSyntax,
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attachedTo decl: some DeclGroupSyntax,
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providingAttributesFor member: some DeclSyntaxProtocol,
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in context: some MacroExpansionContext
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) throws -> [AttributeSyntax] {
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["@available(*, unavailable, message: \"unavailable via macro\")"]
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}
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}
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//--- test.swift
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@attached(memberAttribute)
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macro UnavailableMembers() = #externalMacro(module: "MacroDefinition", type: "UnavailableMembersMacro")
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@UnavailableMembers
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class Base {
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func member() {} // expected-note 2 {{'member()' has been explicitly marked unavailable here}}
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}
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class Sub: Base {
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override func member() {} // expected-error {{cannot override 'member' which has been marked unavailable: unavailable via macro}}
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// expected-note@-1 {{remove 'override' modifier to declare a new 'member'}}
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}
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func useBaseMember(_ b: Base) {
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b.member() // expected-error {{'member()' is unavailable: unavailable via macro}}
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}
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