Fix a bug when default value as nested

Author: hadashiA

src/MemoryPack.Generator/MemoryPackGenerator.Emitter.cs

@@ -1392,13 +1392,13 @@ string EmitExpression(ExpressionSyntax expression)
             {
                 var memberAccess = (MemberAccessExpressionSyntax)expression;
                 var memberSymbol = semanticModel.GetSymbolInfo(memberAccess.Name).Symbol;
-                if (memberSymbol is INamedTypeSymbol namedTypeSymbol && namedTypeSymbol.TypeKind == TypeKind.Enum)
+                if (memberSymbol is INamedTypeSymbol { TypeKind: TypeKind.Enum } namedTypeSymbol)
                 {
-                    return $"{GetTypeFullName(namedTypeSymbol, semanticModel)}.{memberAccess.Name}";
+                    return $"{GetTypeFullName(namedTypeSymbol)}.{memberAccess.Name}";
                 }
-                if (memberSymbol is IFieldSymbol fieldSymbol && fieldSymbol.ContainingType.TypeKind == TypeKind.Enum)
+                if (memberSymbol is IFieldSymbol { Type.TypeKind: TypeKind.Enum } fieldSymbol)
                 {
-                    return $"{GetTypeFullName(fieldSymbol.ContainingType, semanticModel)}.{fieldSymbol.Name}";
+                    return $"{GetTypeFullName(fieldSymbol.Type)}.{fieldSymbol.Name}";
                 }
                 break;
             }
@@ -1412,7 +1412,7 @@ string EmitExpression(ExpressionSyntax expression)
                     var arguments = string.Join(", ",
                         objectCreation.ArgumentList?.Arguments.Select(arg =>
                             EmitExpression(arg.Expression)) ?? Enumerable.Empty<string>());
-                    return $"new {x.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat)}({arguments})";
+                    return $"new {GetTypeFullName(x)}({arguments})";
                 }
                 break;
             }
@@ -1426,10 +1426,15 @@ string EmitExpression(ExpressionSyntax expression)
         return expression.ToString();
     }
 
-    string GetTypeFullName(ITypeSymbol typeSymbol, SemanticModel semanticModel)
+    static string GetTypeFullName(ITypeSymbol typeSymbol)
     {
-        var containingType = typeSymbol.ContainingType;
-        var containingTypeFullName = containingType == null ? "" : GetTypeFullName(containingType, semanticModel) + ".";
-        return containingTypeFullName + typeSymbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat);
+        if (typeSymbol.ContainingType is { } containingType)
+        {
+            // nested type
+            var containgTypeFullName = containingType.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat);
+            var typeName = typeSymbol.ToDisplayString(SymbolDisplayFormat.MinimallyQualifiedFormat);
+            return $"{containgTypeFullName}.{typeName}";
+        }
+        return typeSymbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat);
     }
 }

src/MemoryPack.Generator/Properties/launchSettings.json

@@ -2,7 +2,7 @@
   "profiles": {
     "MemoryPack.Generator": {
       "commandName": "DebugRoslynComponent",
-      "targetProject": "..\\..\\sandbox\\SandboxConsoleApp\\SandboxConsoleApp.csproj"
+      "targetProject": "../../sandbox/SandboxConsoleApp/SandboxConsoleApp.csproj"
     }
   }
-}
+}