Update src/contexts.jl

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: penelopeysm

src/contexts.jl

@@ -276,7 +276,9 @@ end
 
 # TODO(penelopeysm): Prefixing arguably occurs the wrong way round here
 function prefix(ctx::PrefixContext{Prefix}, vn::VarName{Sym}) where {Prefix,Sym}
-    prefix(childcontext(ctx), VarName{Symbol(Prefix, PREFIX_SEPARATOR, Sym)}(getoptic(vn)))
+    return prefix(
+        childcontext(ctx), VarName{Symbol(Prefix, PREFIX_SEPARATOR, Sym)}(getoptic(vn))
+    )
 end
 prefix(ctx::AbstractContext, vn::VarName) = prefix(NodeTrait(ctx), ctx, vn)
 prefix(::IsLeaf, ::AbstractContext, vn::VarName) = vn