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Merge pull request dotnet#1392 from dotnet/dependabot/nuget/Rx.NET/So…

…urce/Verify.Xunit-6.24.0

Merge pull request dotnet#1291 from dotnet/dotnet5

.NET 5 support for Rx.NET

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Avoid infinite generics recursion in SynchronizationContextScheduler

The infinitive generics recursion interacts poorly with AOT. The AOT compilers have hard figuring
out where the stop generating the code for generics with infinite recursion. They either fail or
produce large images by giving up once the generics get too complex.

This change reverts a small part of dotnet#500 that introduced infinite generic recursion and adds comment.

Fixes dotnet/corert#7920

Avoid infinite generics recursion in SynchronizationContextScheduler

The infinitive generics recursion interacts poorly with AOT. The AOT compilers have hard figuring
out where the stop generating the code for generics with infinite recursion. They either fail or
produce large images by giving up once the generics get too complex.

This change reverts a small part of dotnet#500 that introduced infinite generic recursion and adds comment.

Fixes dotnet/corert#7920

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