public Diagnostic[] FromCode()
{
var analyzers = GetCSharpDiagnosticAnalyzers();
var diagnostics = analyzers
.SelectMany(
analyzer => DiagnosticVerifier.GetSortedDiagnostics(new[] { _source }, analyzer),
(analyzer, diagnostic) => new { analyzers, diagnostic });
return(diagnostics.Select(d => d.diagnostic).ToArray());
}