Error compiling parameterized attribute

[weirdan]

When I tried to use NUnit I encountered the following error:

❯ ~/src/Phalanger/Deployment/Release/phpc.exe /pure+ /target:dll /lang:clr /out:obj/Debug/tests/XDebug.Protocol.test.dll test/Unit/Xdebug.Protocol.test.php $(pkg-config --libs nunit| sed s%-r:%/r:%g)
Phalanger - the PHP Language Compiler - version 4.0
for Microsoft (R) .NET Framework version 4.0
Encoding  cannot be loaded.
fileEncoding=""

Performing compilation ...
error PHP2007: Internal error! 
Please, report this bug via http://phalanger.codeplex.com/workitem/list/basic.
Additional information: 
Cannot convert to type System.Object[]
Parameter name: target_type
  at PHP.Core.ConvertToClr.ObjectToType (System.Object obj, System.Type target_type) <0x40cb6a00 + 0x00127> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.NodeCompilers+CustomAttributeCompiler.Emit (PHP.Core.CodeGenerator codeGen, IPhpCustomAttributeProvider target, Boolean force) <0x40cb51f0 + 0x003cf> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.NodeCompilers+CustomAttributeCompiler.Emit (PHP.Core.CodeGenerator codeGen, IPhpCustomAttributeProvider target) <0x40cb51c0 + 0x0001b> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.CustomAttributeCompilerHelper.Emit (PHP.Core.AST.CustomAttribute node, PHP.Core.CodeGenerator codeGen, IPhpCustomAttributeProvider target) <0x40cb5180 + 0x00030> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.NodeCompilers+CustomAttributesCompiler.Emit (PHP.Core.AST.CustomAttributes node, PHP.Core.CodeGenerator codeGenerator, IPhpCustomAttributeProvider target) <0x40cb50a0 + 0x0007b> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.CustomAttributesCompilerHelper.Emit (PHP.Core.AST.CustomAttributes node, PHP.Core.CodeGenerator codeGenerator, IPhpCustomAttributeProvider target) <0x40cb5050 + 0x00037> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.NodeCompilers+TypeMemberDeclCompiler`1[T].Emit (T node, PHP.Core.CodeGenerator codeGenerator) <0x40cb6900 + 0x00057> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.NodeCompilers+MethodDeclCompiler.Emit (PHP.Core.AST.MethodDecl node, PHP.Core.CodeGenerator codeGenerator) <0x40cb64d0 + 0x00027> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.NodeCompilers+TypeMemberDeclCompiler`1[T].PHP.Core.Compiler.AST.ITypeMemberDeclCompiler.Emit (PHP.Core.AST.TypeMemberDecl node, PHP.Core.CodeGenerator codeGenerator) <0x40cb6470 + 0x00055> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.NodeCompilers+TypeDeclCompiler.EmitDefinition (PHP.Core.CodeGenerator codeGenerator) <0x40cb4340 + 0x00159> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.NodeCompilers+TypeDeclCompiler.Emit (PHP.Core.AST.TypeDecl node, PHP.Core.CodeGenerator codeGenerator) <0x40cb40f0 + 0x00027> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.NodeCompilers+StatementCompiler`1[T].PHP.Core.Compiler.AST.IStatementCompiler.Emit (PHP.Core.AST.Statement node, PHP.Core.CodeGenerator codeGenerator) <0x40cb3f90 + 0x00052> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.StatementUtils.Emit (PHP.Core.AST.Statement statement, PHP.Core.CodeGenerator codeGenerator) <0x40cb3f50 + 0x00036> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.NodeCompilers+NamespaceDeclCompiler.Emit (PHP.Core.AST.NamespaceDecl node, PHP.Core.CodeGenerator codeGenerator) <0x40cb3ff0 + 0x0008b> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.NodeCompilers+StatementCompiler`1[T].PHP.Core.Compiler.AST.IStatementCompiler.Emit (PHP.Core.AST.Statement node, PHP.Core.CodeGenerator codeGenerator) <0x40cb3f90 + 0x00052> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.StatementUtils.Emit (PHP.Core.AST.Statement statement, PHP.Core.CodeGenerator codeGenerator) <0x40cb3f50 + 0x00036> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.NodeCompilers+GlobalCodeCompiler.Emit (PHP.Core.AST.GlobalCode ast, PHP.Core.CodeGenerator codeGenerator) <0x40cb2650 + 0x0023b> in <filename unknown>:0 
  at PHP.Core.Compiler.AST.GlobalCodeCompilerHelper.Emit (PHP.Core.AST.GlobalCode ast, PHP.Core.CodeGenerator codeGenerator) <0x40cb25f0 + 0x00036> in <filename unknown>:0 
  at PHP.Core.Reflection.CompilationSourceUnit.Emit (PHP.Core.CodeGenerator codeGenerator) <0x40cb1ad0 + 0x00123> in <filename unknown>:0 
  at PHP.Core.Reflection.PureCompilationUnit.Compile (IEnumerable`1 sourceFiles, PHP.Core.Emit.PureAssemblyBuilder assemblyBuilder, PHP.Core.CompilationContext context, System.Text.Encoding encoding) <0x40b997d0 + 0x0064b> in <filename unknown>:0 
  at PHP.Core.Emit.PureAssemblyBuilder.Build (IEnumerable`1 sourceFiles, PHP.Core.CompilationContext context) <0x40b92990 + 0x00073> in <filename unknown>:0 
  at PHP.Core.ApplicationCompiler.Compile (PHP.Core.ApplicationContext applicationContext, PHP.Core.CompilerConfiguration config, PHP.Core.ErrorSink errorSink, PHP.Core.CompilationParameters ps) <0x40b8e8e0 + 0x0083c> in <filename unknown>:0 


Build complete -- 1 error, 0 warnings.

Source code:

<?php
namespace Weirdan\Xdebug\Protocol\Tests;


use NUnit\Framework\TestFixtureAttribute as TestFixture,
    NUnit\Framework\TestAttribute as Test,
    NUnit\Framework\TestCaseAttribute as TestCase,
    NUnit\Framework\Assert,
    NUnit\Framework\Is;

[assembly:\Export]

[TestFixture]
class TestBasic
{
    [TestCase(12)]
    [\Export]
    function testSomething($arg)
    {
        Assert::That($arg, Is::EqualTo(12));
    }
}

If I take out [TestCase(12)] attribute (or replace it with [Test]) it compiles ok.

TestCaseAttribute is defined like this:

namespace NUnit.Framework
{
    [AttributeUsage (AttributeTargets.Method, AllowMultiple = true, Inherited = false)]
    public class TestCaseAttribute : Attribute, ITestCaseData
    {
        //
        // Properties
        //
        public object[] Arguments { get; }

        public IList Categories { get; }

        public string Category { get; set; }

        public string Description { get; set; }

        public Type ExpectedException { get; set; }

        public string ExpectedExceptionName { get; set; }

        public string ExpectedMessage { get; set; }

        public object ExpectedResult { get; set; }

        public bool Explicit { get; set; }

        public bool HasExpectedResult { get; }

        public bool Ignore { get; set; }

        public bool Ignored { get; set; }

        public string IgnoreReason { get; set; }

        public MessageMatch MatchType { get; set; }

        public string Reason { get; set; }

        public object Result { get; set; }

        public string TestName { get; set; }

        //
        // Constructors
        //
        public TestCaseAttribute (params object[] arguments);

        public TestCaseAttribute (object arg);

        public TestCaseAttribute (object arg1, object arg2);

        public TestCaseAttribute (object arg1, object arg2, object arg3);
    }
}

[lucyllewy]

I'm unsure how to fix this immediately other than the below potential, but very ugly, workaround. However, for a brief synopsis of what I think the problem is: It seems that the argument 12 is attempting to be converted into an array of System.Object but failing.

Possible workaround:
[TestCase(0=>12)]

Explanation of thinking: as it's expecting an array my suggestion is to attempt to convince the parser that 12 is the value of index 0 in an anonymous array.

[bfistein]

@weirdan Phalanger's development is mostly discontinued in favor of PeachPie, the more modern compiler and runtime that also targets .NET Core. Please feel free to give that a try.