/// <summary>
/// Gets all the diagnostics reported by the given <paramref name="analyzer"/>.
/// </summary>
public ImmutableArray <Diagnostic> GetAllDiagnostics(DiagnosticAnalyzer analyzer)
{
if (!Analyzers.Contains(analyzer))
{
throw new ArgumentException(CodeAnalysisResources.UnsupportedAnalyzerInstance, nameof(analyzer));
}
return(GetDiagnostics(SpecializedCollections.SingletonEnumerable(analyzer)));
}