/// <summary>
/// Accumulate diagnostics related to the variance safety of an interface method.
/// </summary>
private static void CheckMethodVarianceSafety(this MethodSymbol method, DiagnosticBag diagnostics)
{
method.CheckMethodVarianceSafety(
returnTypeLocationProvider: m =>
{
var syntax = m.GetDeclaringSyntax <MethodDeclarationSyntax>();
return((syntax == null) ? null : syntax.ReturnType.Location);
},
diagnostics: diagnostics);
}
