Fix issue with kwarg interpreted as iterator

Author: lkdvos

src/spaces/gradedspace.jl

@@ -170,8 +170,7 @@ end
 function infimum(V₁::GradedSpace{I}, V₂::GradedSpace{I}) where {I<:Sector}
     if V₁.dual == V₂.dual
         typeof(V₁)(c => min(dim(V₁, c), dim(V₂, c))
-                   for c in
-                       union(sectors(V₁), sectors(V₂)), dual in V₁.dual)
+                   for c in union(sectors(V₁), sectors(V₂)); dual=V₁.dual)
     else
         throw(SpaceMismatch("Infimum of space and dual space does not exist"))
     end
@@ -180,8 +179,7 @@ end
 function supremum(V₁::GradedSpace{I}, V₂::GradedSpace{I}) where {I<:Sector}
     if V₁.dual == V₂.dual
         typeof(V₁)(c => max(dim(V₁, c), dim(V₂, c))
-                   for c in
-                       union(sectors(V₁), sectors(V₂)), dual in V₁.dual)
+                   for c in union(sectors(V₁), sectors(V₂)); dual=V₁.dual)
     else
         throw(SpaceMismatch("Supremum of space and dual space does not exist"))
     end