TypeExtensions.ToTypeString throws exception for open generic types

[mikechristiansenvae]

Describe the bug

TypeExtensions.ToTypeString throws an ArgumentOutOfRangeException for open generic types.

Example on .NET Fiddle

Regression

No response

Steps to reproduce

1. Run the following code:

using CommunityToolkit.Diagnostics;
System.Console.WriteLine(typeof(Foo<>).ToTypeString());
public sealed record Foo<T>;

2. Observe the exception is thrown

Unhandled exception. System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
   at CommunityToolkit.Diagnostics.TypeExtensions.<ToTypeString>g__FormatDisplayString|2_0(Type type, Int32 genericTypeOffset, ReadOnlySpan`1 typeArguments) in /_/src/CommunityToolkit.Diagnostics/Extensions/TypeExtensions.cs:line 110
   at CommunityToolkit.Diagnostics.TypeExtensions.<ToTypeString>g__FormatDisplayString|2_0(Type type, Int32 genericTypeOffset, ReadOnlySpan`1 typeArguments) in /_/src/CommunityToolkit.Diagnostics/Extensions/TypeExtensions.cs:line 131
   at CommunityToolkit.Diagnostics.TypeExtensions.<>c.<ToTypeString>b__2_3(Type t) in /_/src/CommunityToolkit.Diagnostics/Extensions/TypeExtensions.cs:line 114
   at System.Linq.Enumerable.SelectArrayIterator`2.MoveNext()
   at System.String.Join(String separator, IEnumerable`1 values)
   at CommunityToolkit.Diagnostics.TypeExtensions.<ToTypeString>g__FormatDisplayString|2_0(Type type, Int32 genericTypeOffset, ReadOnlySpan`1 typeArguments) in /_/src/CommunityToolkit.Diagnostics/Extensions/TypeExtensions.cs:line 114
   at CommunityToolkit.Diagnostics.TypeExtensions.<>c.<ToTypeString>b__2_1(Type t) in /_/src/CommunityToolkit.Diagnostics/Extensions/TypeExtensions.cs:line 164
   at System.Runtime.CompilerServices.ConditionalWeakTable`2.GetValueLocked(TKey key, CreateValueCallback createValueCallback)
   at System.Runtime.CompilerServices.ConditionalWeakTable`2.GetValue(TKey key, CreateValueCallback createValueCallback)
   at CommunityToolkit.Diagnostics.TypeExtensions.ToTypeString(Type type) in /_/src/CommunityToolkit.Diagnostics/Extensions/TypeExtensions.cs:line 138
   at Program.<Main>$(String[] args)
Command terminated by signal 6

Expected behavior

typeof(Foo<>).ToTypeString() should produce the text Foo<>

Screenshots

No response

IDE and version

Rider

IDE version

#RD-223.8617.53

Nuget packages

• CommunityToolkit.Common
• CommunityToolkit.Diagnostics
• CommunityToolkit.HighPerformance
• CommunityToolkit.Mvvm (aka MVVM Toolkit)

Nuget package version(s)

8.1.0

Additional context

No response

Help us help you

No, just wanted to report this

[Sergio0694]

Duplicate of #390.