Collection<String> (@NotNull GrExpression qualifier, @Nullable PsiElement resolve) { Pair<ConfigSlurperSupport.PropertiesProvider, List<String>> info = getInfo(qualifier, resolve); if (info == null) return Collections.emptyList(); final Set<String> res = new HashSet<>(); info.first.collectVariants(info.second, (variant, isFinal) -> res.add(variant)); return res; }