Update swift-syntax version and improve type constraints to resolve errors & warnings

.gitignore

@@ -59,6 +59,7 @@ Package.resolved
 *.o
 *.d
 *.swiftdeps*
+*.dia
 
 # CocoaPods
 #

CHANGELOG.md

@@ -10,6 +10,7 @@
 ### 🐛 Fixes
 
 * fixed optional types not detected with `valueCoder` strategy ([#141](https://github.com/SwiftyLab/MetaCodable/issues/141)) ([5873c3e](https://github.com/SwiftyLab/MetaCodable/commit/5873c3e33ab98e61c06304bfc2a2c93ab199d65d))
+* removed unreachable `default` case warnings for `Bool` type switches in macro-generated code
 
 ## [1.5.0](https://github.com/SwiftyLab/MetaCodable/compare/v1.4.0...v1.5.0) (2025-07-08)
 

Package.swift

@@ -35,6 +35,7 @@ let package = Package(
                 .product(name: "SwiftDiagnostics", package: "swift-syntax"),
                 .product(name: "SwiftSyntaxBuilder", package: "swift-syntax"),
                 .product(name: "SwiftSyntaxMacros", package: "swift-syntax"),
+                .product(name: "SwiftSyntaxMacroExpansion", package: "swift-syntax"),
                 .product(name: "OrderedCollections", package: "swift-collections"),
             ]
         ),

Package@swift-5.swift

@@ -34,6 +34,7 @@ let package = Package(
                 .product(name: "SwiftDiagnostics", package: "swift-syntax"),
                 .product(name: "SwiftSyntaxBuilder", package: "swift-syntax"),
                 .product(name: "SwiftSyntaxMacros", package: "swift-syntax"),
+                .product(name: "SwiftSyntaxMacroExpansion", package: "swift-syntax"),
                 .product(name: "OrderedCollections", package: "swift-collections"),
             ]
         ),

Sources/PluginCore/Variables/Enum/Switcher/TaggedEnumSwitcherVariable.swift

@@ -21,7 +21,9 @@ extension TaggedEnumSwitcherVariable {
     ///   - location: The decoding location.
     ///   - coder: The decoder for cases.
     ///   - context: The context in which to perform the macro expansion.
-    ///   - default: Whether default case is needed.
+    ///   - default: Whether default case is needed. Note that for Bool type,
+    ///     the default case is automatically skipped since both true and false
+    ///     cases are explicitly handled, avoiding unreachable default warnings.
     ///   - forceDecodingReturn: Whether to force explicit `return` statements in each
     ///     switch case. When `true`, adds a `return` statement after the case assignment
     ///     for early exit. Defaults to `false` for backward compatibility.
@@ -60,7 +62,7 @@ extension TaggedEnumSwitcherVariable {
                 }
             }
 
-            if `default` {
+            if `default` && header.type != .bool {
                 SwitchCaseSyntax(label: .default(.init())) {
                     "break"
                 }

Sources/PluginCore/Variables/Type/EnumVariable.swift

@@ -84,15 +84,19 @@ package struct EnumVariable: TypeVariable, DeclaredVariable {
         let caseEncodeExpr: CaseCode = { name, variables in
             let args = Self.encodingArgs(representing: variables)
             let callee: ExprSyntax = ".\(name)"
-            let fExpr =
-                if !args.isEmpty {
-                    FunctionCallExprSyntax(callee: callee) { args }
-                } else {
-                    FunctionCallExprSyntax(
-                        calledExpression: callee, leftParen: nil, rightParen: nil
-                    ) {}
-                }
-            return ExprSyntax(fExpr)
+            if args.isEmpty {
+                /// No associated values: return just the case name without parentheses
+                return callee
+            } else {
+                let fExpr = FunctionCallExprSyntax(
+                    calledExpression: callee,
+                    leftParen: .leftParenToken(),
+                    arguments: args,
+                    rightParen: .rightParenToken(),
+                    trailingClosure: nil
+                )
+                return ExprSyntax(fExpr)
+            }
         }
         self.init(
             from: decl, in: context,

Tests/MetaCodableTests/CodedAs/CodedAsTests.swift

@@ -332,8 +332,6 @@ struct CodedAsTests {
                                         value = try container.decode(Int.self, forKey: CodingKeys.value)
                                         self = .store(key: key, value: value)
                                         return
-                                    default:
-                                        break
                                     }
                                 }
                                 let typeInt: Int?

Tests/MetaCodableTests/ConformCodableTests.swift

@@ -464,3 +464,4 @@ struct ConformDecodableTests {
         }
     }
 }
+