- Use custom test runner for correctness tests.
- Use .NET 6.0 framework for all Roslyn compiler tests.
- Disabled tests involving new string interpolation patterns.
Remove the committed .il files: these were originally intended to prevent test failures due to differences in the C# compiler on the system.
But legacy csc stopped changing long ago; and roslyn is tested via NuGet package, so everyone is using the same version.
Interestingly enough, avoiding the roundtrip through ildasm/ilasm caused some test failures due to changes in the order of top-level types.
So I've started sorting the types by name to ensure consistency in the tests. This required adjusting some existing tests.