Version Used:

.NET SDK 5.0.100-alpha1-014075

Steps to Reproduce:

1. Get https://github.com/dotnet/performance
2. Run dotnet run -f netcoreapp5.0 -c Release from performance/src/benchmarks/micro/ directory

Expected Behavior:

No error.

Actual Behavior:

corefx/System.Buffers/ArrayPoolTests.cs(44,21): error CS0019: Operator '==' cannot be applied to operands of type 'T' and 'default' [/Users/filipnavara/agent/_work/1/s/work/performance/src/benchmarks/micro/MicroBenchmarks.csproj]

Relevant code:

https://github.com/dotnet/performance/blob/97d49cfc30502b835122d360ca4b93f29215d4cc/src/benchmarks/micro/corefx/System.Buffers/ArrayPoolTests.cs#L39-L47

This worked few hours ago with the latest .NET SDK from git master (as of 06/09/2019, 18:09:56 UTC; reported by BDN as .NET Core 5.0.0-alpha1.19456.2 (CoreCLR 5.0.19.45509, CoreFX 5.0.19.45516), X64 RyuJIT). I assume the Roslyn dependency got bumped and introduced some breaking change.