// Don't filter type parameters here, by analogy with function parameters
		// which are not filtered for top-level function declarations.
		if name := s.Name.Name; token.IsExported(name) {
			r.filterType(r.lookupType(s.Name.Name), s.Type)
			return true
		} else if IsPredeclared(name) {
			if r.shadowedPredecl == nil {
				r.shadowedPredecl = make(map[string]bool)
			}
			r.shadowedPredecl[name] = true
		}
	}