Fix #1523: Search throws EnumUnderlyingTypeResolverException

ICSharpCode.Decompiler/CSharp/CSharpDecompiler.cs

@@ -1406,27 +1406,6 @@ namespace ICSharpCode.Decompiler.CSharp
 			return false;
 		}
 
-		internal static bool IsFixedField(MetadataReader metadata, FieldDefinitionHandle handle, out IType type, out int elementCount)
-		{
-			type = null;
-			elementCount = 0;
-			var field = metadata.GetFieldDefinition(handle);
-			foreach (var h in field.GetCustomAttributes()) {
-				var customAttribute = metadata.GetCustomAttribute(h);
-				if (customAttribute.IsKnownAttribute(metadata, KnownAttribute.FixedBuffer)) {
-					var value = customAttribute.DecodeValue(MetadataExtensions.minimalCorlibTypeProvider);
-					if (value.FixedArguments.Length == 2) {
-						if (value.FixedArguments[0].Value is IType trr && value.FixedArguments[1].Value is int length) {
-							type = trr;
-							elementCount = length;
-							return true;
-						}
-					}
-				}
-			}
-			return false;
-		}
-
 		EntityDeclaration DoDecompile(IProperty property, DecompileRun decompileRun, ITypeResolveContext decompilationContext)
 		{
 			Debug.Assert(decompilationContext.CurrentMember == property);

ICSharpCode.Decompiler/CSharp/OutputVisitor/CSharpAmbience.cs

@@ -137,7 +137,7 @@ namespace ICSharpCode.Decompiler.CSharp.OutputVisitor
 					writer.Space();
 					writer.WriteToken(Roles.Colon, ":");
 					writer.Space();
-					if (symbol is IField f && CSharpDecompiler.IsFixedField(f.ParentModule.PEFile.Metadata, (System.Reflection.Metadata.FieldDefinitionHandle)f.MetadataToken, out var type, out int elementCount)) {
+					if (symbol is IField f && CSharpDecompiler.IsFixedField(f, out var type, out int elementCount)) {
 						rt = astBuilder.ConvertType(type);
 						new IndexerExpression(new TypeReferenceExpression(rt), astBuilder.ConvertConstantValue(f.Compilation.FindType(KnownTypeCode.Int32), elementCount))
 							.AcceptVisitor(new CSharpOutputVisitor(writer, formattingPolicy));

ICSharpCode.Decompiler/TypeSystem/TypeProvider.cs

@@ -131,7 +131,6 @@ namespace ICSharpCode.Decompiler.TypeSystem
 
 		public IType GetTypeFromReference(SRM.MetadataReader reader, SRM.TypeReferenceHandle handle, byte rawTypeKind)
 		{
-			var asmref = handle.GetDeclaringModule(reader);
 			bool? isReferenceType = IsReferenceType(reader, handle, rawTypeKind);
 			var gctr = new GetClassTypeReference(handle.GetFullTypeName(reader), handle.GetDeclaringModule(reader), isReferenceType);
 			return gctr.Resolve(module != null ? new SimpleTypeResolveContext(module) : new SimpleTypeResolveContext(compilation));