Fix sum notation

src/all_building_blocks/base_building_blocks.jl

@@ -149,7 +149,7 @@ function qval(bb::BaseBuildingBlock, index1, index2)
     if (!isnothing(index1)) && (index1 == index2)
         return zeros(3)
     end
-    sum((i, wv) -> qval(wv), waveform_sequence(bb, index1, index2); init=0.)
+    sum([qval(wv) for (_, wv) in waveform_sequence(bb, index1, index2)]; init=0.)
 end
 qval(bb::BaseBuildingBlock) = qval(bb, nothing, nothing)