Ensure that NamedTypeSymbols are not being rewritten

src/EntityFrameworkCore.Projectables.Generator/ExpressionSyntaxRewriter.cs

@@ -136,7 +136,7 @@ public ExpressionSyntaxRewriter(INamedTypeSymbol targetTypeSymbol, NullCondition
                     if (node.Parent is MemberAccessExpressionSyntax parentMemberAccessNode)
                     {
                         var targetSymbolInfo = _semanticModel.GetSymbolInfo(parentMemberAccessNode.Expression);
-                        if (targetSymbolInfo.Symbol is { Kind: SymbolKind.Parameter })
+                        if (targetSymbolInfo.Symbol is { Kind: SymbolKind.Parameter or SymbolKind.NamedType })
                         {
                             rewrite = false;
                         }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.EnumAccessor.received.txt

@@ -0,0 +1,14 @@
+using EntityFrameworkCore.Projectables;
+
+namespace EntityFrameworkCore.Projectables.Generated
+#nullable disable
+{
+    public static class _SomeExtensions_Test
+    {
+        public static System.Linq.Expressions.Expression<System.Func<global::SomeFlag, bool>> Expression()
+        {
+            return (global::SomeFlag f) => 
+                f == global::SomeFlag.Foo;
+        }
+    }
+}

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.EnumAccessor.verified.txt

@@ -0,0 +1,14 @@
+using EntityFrameworkCore.Projectables;
+
+namespace EntityFrameworkCore.Projectables.Generated
+#nullable disable
+{
+    public static class _SomeExtensions_Test
+    {
+        public static System.Linq.Expressions.Expression<System.Func<global::SomeFlag, bool>> Expression()
+        {
+            return (global::SomeFlag f) => 
+                f == global::SomeFlag.Foo;
+        }
+    }
+}

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.cs

@@ -1019,6 +1019,32 @@ public class Bar {
             return Verifier.Verify(result.GeneratedTrees[0].ToString());
         }
 
+        [Fact]
+        public Task EnumAccessor()
+        {
+            var compilation = CreateCompilation(@"
+using EntityFrameworkCore.Projectables;
+
+public enum SomeFlag
+{
+    Foo
+}
+
+public static class SomeExtensions
+{
+    [Projectable]
+    public static bool Test(this SomeFlag f) => f == SomeFlag.Foo;
+}
+");
+
+            var result = RunGenerator(compilation);
+
+            Assert.Empty(result.Diagnostics);
+            Assert.Single(result.GeneratedTrees);
+
+            return Verifier.Verify(result.GeneratedTrees[0].ToString());
+        }
+
         #region Helpers
 
         Compilation CreateCompilation(string source, bool expectedToCompile = true)