From ed7facdd4a361514b46e3bbc6238cd41c84be4ec Mon Sep 17 00:00:00 2001
From: HanjunYu <hj56775@gmail.com>
Date: Thu, 16 Nov 2023 03:19:32 +0900
Subject: [PATCH] Fix compile error caused by wildcard argument usage (#130)

* Fix compile error caused by wildcard argument usage

* Apply suggestions from code review

---------

Co-authored-by: hanjun-yu <hanjun.yu@snowcorp.com>
Co-authored-by: Stephen Celis <stephen.celis@gmail.com>
---
 .../CasePathsMacros/CasePathableMacro.swift   |  5 +++
 .../CasePathableMacroTests.swift              | 34 +++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/Sources/CasePathsMacros/CasePathableMacro.swift b/Sources/CasePathsMacros/CasePathableMacro.swift
index cf2e483a..aa511f69 100644
--- a/Sources/CasePathsMacros/CasePathableMacro.swift
+++ b/Sources/CasePathsMacros/CasePathableMacro.swift
@@ -257,6 +257,11 @@ extension EnumCaseElementListSyntax.Element {
         for index in associatedValue.parameters.indices {
           associatedValue.parameters[index].type.trailingTrivia = ""
           associatedValue.parameters[index].defaultValue = nil
+          if associatedValue.parameters[index].firstName?.tokenKind == .wildcard {
+            associatedValue.parameters[index].colon = nil
+            associatedValue.parameters[index].firstName = nil
+            associatedValue.parameters[index].secondName = nil
+          }
         }
         return "(\(associatedValue.parameters.trimmed))"
       }
diff --git a/Tests/CasePathsMacrosTests/CasePathableMacroTests.swift b/Tests/CasePathsMacrosTests/CasePathableMacroTests.swift
index 2ee60aa9..5d2a4938 100644
--- a/Tests/CasePathsMacrosTests/CasePathableMacroTests.swift
+++ b/Tests/CasePathsMacrosTests/CasePathableMacroTests.swift
@@ -299,6 +299,40 @@ final class CasePathableMacroTests: XCTestCase {
       """
     }
   }
+  
+  func testWildcard() {
+    assertMacro {
+      """
+      @CasePathable enum Foo {
+        case bar(_ int: Int, _ bool: Bool)
+      }
+      """
+    } expansion: {
+      """
+      enum Foo {
+        case bar(_ int: Int, _ bool: Bool)
+
+        struct AllCasePaths {
+          var bar: CasePaths.AnyCasePath<Foo, (Int, Bool)> {
+            CasePaths.AnyCasePath<Foo, (Int, Bool)>(
+              embed: Foo.bar,
+              extract: {
+                guard case let .bar(v0, v1) = $0 else {
+                  return nil
+                }
+                return (v0, v1)
+              }
+            )
+          }
+        }
+        static var allCasePaths: AllCasePaths { AllCasePaths() }
+      }
+
+      extension Foo: CasePaths.CasePathable {
+      }
+      """
+    }
+  }
 
   func testSelf() {
     assertMacro {