+
+ if (scm_is_symbol (this_layer))
+ {
+ if (scm_is_eq (this_layer, ly_symbol2scm ("any")))
+ {
+ // layer is kept alive by any other layer
+ live->add (group_spanners_[j]);
+ continue;
+ }
+ else if (scm_is_eq (this_layer, ly_symbol2scm ("above")))
+ {
+ // layer is kept alive by the layer preceding it
+ if (i == j + 1)
+ live->add (group_spanners_[j]);
+ continue;
+ }
+ else if (scm_is_eq (this_layer, ly_symbol2scm ("below")))
+ {
+ // layer is kept alive by the layer following it
+ if (i == j - 1)
+ live->add (group_spanners_[j]);
+ continue;
+ }
+ else
+ {
+ group_spanners_[i]->warning (_f ("unknown remove-layer value `%s'",
+ ly_symbol2string (this_layer).c_str ()));
+ continue;
+ }
+ }
+