compiler: Use Macro to Derive CompilableStatement Implementations

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>

Sources/Macros/Macros.swift

@@ -439,17 +439,14 @@ public struct CliTestDeclarationMacro: PeerMacro, Sendable {
   }
 }
 
-public struct DeriveCompilableStatement: PeerMacro, Sendable {
+public enum DeriveCompilableStatement: MemberMacro {
   public static func expansion(
-    of node: AttributeSyntax,
-    providingPeersOf declaration: some DeclSyntaxProtocol,
-    in context: some MacroExpansionContext
+    of: AttributeSyntax, providingMembersOf type: some DeclGroupSyntax, conformingTo: [TypeSyntax],
+    in: some MacroExpansionContext
   ) throws -> [DeclSyntax] {
 
-    let type_name = declaration.cast(ExtensionDeclSyntax.self).extendedType
     let implementation = DeclSyntax(
       """
-        extension VariableDeclarationStatement: CompilableStatement {
           public static func CompileStatement(
             node: Node, withContext context: CompilerContext
           ) -> Result<P4Statement> {
@@ -458,7 +455,6 @@ public struct DeriveCompilableStatement: PeerMacro, Sendable {
               case .Error(let e): .Error(e)
             }
           }
-        }
       """)
     return [implementation]
   }