generic-where-clause for macro declaration should be optional.

[JanWillemBrands]

Location

https://docs.swift.org/swift-book/documentation/the-swift-programming-language/summaryofthegrammar/

Description

The Swift 6.3 grammar contains:

macro-declaration → macro-head identifier generic-parameter-clause? macro-signature macro-definition? generic-where-clause

The generic-where-clause should be optional, as evidenced by the SwiftSyntax model of MacroDecl:

Child(
  name: "genericWhereClause",
  kind: .node(kind: .genericWhereClause),
  ...
  isOptional: true
)

Correction

macro-declaration → macro-head identifier generic-parameter-clause? macro-signature macro-definition? generic-where-clause?