public LookupResult Lookup(NameSyntax name, Package fromPackage)
{
return(name.Match().Returning <LookupResult>()
.With <QualifiedNameSyntax>(qualifiedName =>
{
var context = Lookup(qualifiedName.Left, fromPackage);
return context.Lookup(qualifiedName.Right, fromPackage);
})
.With <IdentifierNameSyntax>(i => Lookup(i, fromPackage))
.Exhaustive());
}