public static IHaveToken <T1> Exists <T1>(this IRegister register,
Expression <Func <IEnumerable <T1> > > srcFunc,
[CallerFilePath] string file = "",
[CallerLineNumber] int line = 0,
[CallerMemberName] string member = "")
{
var diag = DiagInfoExpressionFactory.CreateDiag(file, line, member, srcFunc);
return(register.Exists(diag, srcFunc.Compile()));
}
public IHaveToken <T> Exists <T>(IDiagInfo diagInfo, Func <IEnumerable <T> > srcFunc) => reg.Exists(diagInfo, srcFunc);