Avoid erroneous missing default diagnosis

Sources/DependenciesMacrosPlugin/DependencyClientMacro.swift

@@ -22,10 +22,9 @@ public enum DependencyClientMacro: MemberAttributeMacro, MemberMacro {
       return []
     }
     // NB: Ideally `@DependencyEndpoint` would handle this for us, but there are compiler crashes
-    if let initializer = binding.initializer,
-      try initializer.diagnose(node, context: context).earlyOut
-    {
-      return []
+    if let initializer = binding.initializer {
+      guard try !initializer.diagnose(node, context: context).earlyOut
+      else { return [] }
     } else if functionType.effectSpecifiers?.throwsSpecifier == nil,
       !functionType.isVoid,
       !functionType.isOptional

Tests/DependenciesMacrosPluginTests/DependencyClientMacroTests.swift

@@ -242,6 +242,33 @@ final class DependencyClientMacroTests: BaseTestCase {
     }
   }
 
+  func testDefaultValue() {
+    assertMacro {
+      """
+      @DependencyClient
+      struct Client {
+        var endpoint: () -> Int = { 42 }
+      }
+      """
+    } expansion: {
+      """
+      struct Client {
+        @DependencyEndpoint
+        var endpoint: () -> Int = { 42 }
+
+        init(
+          endpoint: @escaping () -> Int
+        ) {
+          self.endpoint = endpoint
+        }
+
+        init() {
+        }
+      }
+      """
+    }
+  }
+
   func testPrivate_WithDefault() {
     assertMacro {
       """