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Mar 5, 2023
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Add a test for a macro introducing members to an enum #64114

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14 changes: 14 additions & 0 deletions test/Macros/Inputs/syntax_macro_definitions.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -1082,3 +1082,17 @@ public struct DelegatedConformanceMacro: ConformanceMacro, MemberMacro {
return [requirement]
}
}

public struct ExtendableEnum: MemberMacro {
public static func expansion(
of node: AttributeSyntax,
providingMembersOf declaration: some DeclGroupSyntax,
in context: some MacroExpansionContext
) throws -> [DeclSyntax] {
let unknownDecl: DeclSyntax =
"""
func unknown() -> Int { 34 } // or something like: `case unknown`
"""
return [unknownDecl]
}
}
11 changes: 11 additions & 0 deletions test/Macros/macro_expand.swift
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Expand Up @@ -171,6 +171,17 @@ func testNestedDeclInExpr() {
@freestanding(declaration, names: named(A), named(B), named(foo), named(addOne))
macro defineDeclsWithKnownNames() = #externalMacro(module: "MacroDefinition", type: "DefineDeclsWithKnownNamesMacro")

// Macros adding to an enum
@attached(member, names: named(unknown), arbitrary)
public macro ExtendableEnum() = #externalMacro(module: "MacroDefinition", type: "ExtendableEnum")

@ExtendableEnum
enum ElementType {
case paper
}

print(ElementType.paper.unknown())

// FIXME: Declaration macro expansions in BraceStmt don't work yet.
//#bitwidthNumberedStructs("MyIntGlobal")

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