Type.GetType doesn't return null for "System.Int32[,*,]"

[MaximLipnin]

Steps to Reproduce

using System;

class Program
{
	static void Main()
	{
		Type t = Type.GetType("System.Int32[,*,]", throwOnError: false, ignoreCase: false);
		Console.WriteLine($"t is null : {t == null}");
	}
}

Current Behavior

The output is:
t is null : False

Expected Behavior

The output should be:
t is null : True

On which platforms did you notice this

[X] macOS
[ ] Linux
[ ] Windows

Version Used:

5.16

Stacktrace

Please paste the stack trace here if available.

[marek-safar]

/cc @lambdageek

[lambdageek]

This is a bug in the unmanaged type name parser. The managed type name parser correctly reports the problem.

mono/mcs/class/corlib/System/TypeSpec.cs

Lines 561 to 562 in 1076d74

	if (dimensions > 1 && bound)
	throw new ArgumentException ("Invalid array spec, multi-dimensional array cannot be bound", "typeName");

We're missing the corresponding check in reflection.c _mono_reflection_parse_type

---

Test case for the managed parser is:

using System;

class Program
{
	static void Main()
	{
		string s = "System.Int32[,*,]";
		Func<System.Reflection.AssemblyName,System.Reflection.Assembly> assemblyResolver =
			(asmName) => {
			return AppDomain.CurrentDomain.Load (asmName);
		};
		Func<System.Reflection.Assembly,string,bool,Type> typeResolver =
			(assembly, typeName, ignoreCase) => {
			return assembly.GetType (typeName, ignoreCase);
		};
		Type t = Type.GetType (s, assemblyResolver, typeResolver);
	}
}