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https://github.com/apple/swift.git
synced 2026-10-18 17:49:23 +02:00
Allan Shortlidge
608e8693ab
Previously, the compiler would emit a note pointing to the unavailable declaration and highlight the range of the attribute that makes the decl unavailable. Unfortunately the highlight is rarely rendered because most frontends only show highlights that are on the same line as the location pointed to by the diagnostic and `@available` is not usually written on the same line as the declaration it is attached to. Switch to pointing to the attribute itself so that this crucial information is always rendered.
50 lines
1.8 KiB
Swift
50 lines
1.8 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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// expected-note@-1 {{in expansion of macro 'UnavailableMembers' on instance method 'member()' here}}
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class Base {
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func member() {} // expected-note {{'member()' has been explicitly marked unavailable here}}
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/*
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expected-expansion@-2:3{{
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expected-note@1{{'member()' has been explicitly marked unavailable here}}
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}}
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*/
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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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