Updating samples to use xunit
Fixes https://github.com/dotnet/roslyn/issues/6843
Fixes https://github.com/dotnet/roslyn/issues/6422
Fixes https://github.com/dotnet/roslyn/issues/5918

Bump the compiler MSBuild task version on every build

Fixes #7470 NRE in build task

Fixes #7185.

Verify improved errors for name lookup

Skip a flaky test

Fixes #7493
Closes #7815

Fix design time builds in the Roslyn solution for PublicSign projects

Because #7812 is not yet fixed, the IDE doesn't know if we set the
PublicSign flag. As a result, all design-time builds will thing we're
real-signing, which causes semantics to get all screwed up. The
workaround for now is, for design-time builds only, to pass the
DelaySign flag since that's "good enough".

Fixes GitHub issue #7790.

Kill msbuild before each CI run

If non-roslyn runs enable node reuse and leave instances floating around,
roslyn will reuse them (even with node reuse disabled) and have problems
(e.g. because the build task is not the expected version).

Skip flaky tests

Make /delaysign and /publicsign used together an error

Account for presence of inapplicable extension methods of the same viability when binding arguments for error recovery in presence of single instance method candidate.

Fix link to point to correct FixAllProvider

https://github.com/dotnet/roslyn/issues/7618
https://github.com/dotnet/roslyn/issues/7803

Throttle async event queues

Add System.Runtime.Numerics to CsiCore and VbiCore dependencies

the race itself already existed but this PR made the race to surface.

Enable skipped tests

Add an ICompilationUnitSyntax interface to allow for a common way to operate on VB and C# root nodes.

Couple of code fixes

Moves random source generation into helper library

Avoid async deadlock in InteractiveHost...

Account for presence of inapplicable extension methods of the same viability when binding arguments for error recovery in presence of single instance method candidate.

Fixes #5128.