using System.Linq.Expressions;
using ExpressionTreeToString;

//OK
_ = ((Expression<Func<TestEnum, bool>>)(it => it > TestEnum.A)).ToString("c#");

//OK
_ = ((Expression<Func<TestEnum, bool>>)(it => it > (TestEnum)1)).ToString("c#");

//OK
_ = ((Expression<Func<TestEnum, bool>>)(it => (int)it > 1)).ToString("c#");

//EXCEPTION
_ = ((Expression<Func<TestEnum, bool>>)(it => (int)it > 0)).ToString("c#");

//EXCEPTION
_ = ((Expression<Func<TestEnum, bool>>)(it => it > (TestEnum)0)).ToString("c#");

public enum TestEnum { A = 1 }

Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
   at ExpressionTreeToString.Util.ExpressionExtensions.Deconstruct(Expression expr, ExpressionType& nodeType, Type& type)
   at ExpressionTreeToString.CSharpWriterVisitor.getPrecedence(Expression node, Type parentType)
   at ExpressionTreeToString.CSharpWriterVisitor.Parens(OneOf`2 arg, String path, Expression childNode)
   at ExpressionTreeToString.CSharpWriterVisitor.WriteBinary(ExpressionType nodeType, String leftPath, Expression left, String rightPath, Expression right)
   at ExpressionTreeToString.CodeWriterVisitor.WriteBinary(BinaryExpression expr)
   at ExpressionTreeToString.BuiltinsWriterVisitor.writeExpression(Expression expr)
   at ExpressionTreeToString.BuiltinsWriterVisitor.WriteNodeImpl(Object o, Boolean parameterDeclaration, Object metadata)
   at ExpressionTreeToString.WriterVisitorBase.WriteNode(String pathSegment, Object o, Boolean parameterDeclaration, Object metadata)
   at ExpressionTreeToString.CSharpWriterVisitor.WriteLambda(LambdaExpression expr)
   at ExpressionTreeToString.BuiltinsWriterVisitor.writeExpression(Expression expr)
   at ExpressionTreeToString.BuiltinsWriterVisitor.WriteNodeImpl(Object o, Boolean parameterDeclaration, Object metadata)
   at ExpressionTreeToString.WriterVisitorBase.WriteNode(String pathSegment, Object o, Boolean parameterDeclaration, Object metadata)
   at ExpressionTreeToString.WriterVisitorBase..ctor(Object o, OneOf`2 languageArg, IEnumerable`1 insertionPointKeys, Boolean hasPathSpans)
   at ExpressionTreeToString.BuiltinsWriterVisitor..ctor(Object o, OneOf`2 languageArg, IEnumerable`1 insertionPointKeys, Boolean hasPathSpans)
   at ExpressionTreeToString.CodeWriterVisitor..ctor(Object o, OneOf`2 languageArg, Boolean hasPathSpans)
   at ExpressionTreeToString.CSharpWriterVisitor..ctor(Object o, Boolean hasPathSpans)
   at ExpressionTreeToString.Renderers.<>c.<.cctor>b__6_0(Object o, OneOf`2 languageArg, Boolean usePathSpans)
   at ExpressionTreeToString.Renderers.Invoke(OneOf`2 rendererArg, Object o, OneOf`2 language)
   at ExpressionTreeToString.ExpressionExtension.ToString(Expression expr, OneOf`2 rendererArg, OneOf`2 language)