CA2000 false positives with DisposeAsync

[manchas]

Analyzer package

Microsoft.CodeAnalysis.FxCopAnalyzers

Package Version

v2.9.8 (Latest)
Visual studio 2019 16.4.1
C# 8

Diagnostic ID

CA2000 Call System.IDisposable.Dispose on object created by 'new StreamWriter(stream)' before all references to it are out of scope.

Repro steps

async Task Foo() { await using var sw= new StreamWriter("hello.txt"); await sw.WriteAsync("world").ConfigureAwait(false); }

Expected behavior

No violation.
Clearly the code is not calling Dispose(), but it is calling DisposeAsync() which should satisfy the condition of CA2000 for not throwing. With using instead of await using the violation goes away as expected, but using is not recommended as StreamWriter's Dispose BLOCKS the thread until the flush is done... A really bad practice

Actual behavior

Violation

[mavasani]

Duplicate of #3042