@Nullable
  CompilerDirectHierarchyInfo getFunExpressions(@NotNull PsiNamedElement functionalInterface,
                                                @NotNull GlobalSearchScope searchScope,
                                                @NotNull FileType searchFileType);
@Nullable
  CompilerDirectHierarchyInfo getFunExpressions(@NotNull PsiNamedElement functionalInterface,
                                                @NotNull GlobalSearchScope searchScope,
                                                @NotNull FileType searchFileType)