Add better error

peal · May 5, 2021 · 1cdbe81 · 1cdbe81
1 parent 072e9cb
commit 1cdbe81
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/gap/GraphBacktracking.gi b/gap/GraphBacktracking.gi
@@ -75,6 +75,9 @@ InstallMethod(ApplyFilters, [IsGBState, IsTracer, IsObject],
                 return false;
             fi;
         else
+            if not IsRecord(f) then
+                ErrorNoReturn("Refiner must be a function or record: ", filters);
+            fi;
             if IsBound(f.vertlabels) then
                 # Note that this only covers the 'basic' vertices, any extended ones
                 # are handled later in 'ShiftGraph'