lily-lexer.cc contains for (SCM scope : as_ly_scm_list (scopes_)) ly_use_module (module, scope);
When I read this code again after modifying it some time ago, my reaction was "what, scopes_ will be SCM_EOL at the end of this iteration, didn't I introduce a big bad bug??", but inserting debug message () statements shows that this is not true. I understand that ly_scm_list takes an rvalue and disallows lvalues for clarity, while as_ly_scm_list takes an lvalue, and will fail on an rvalue by design, with the failure being a compilation failure since e67154f7e330b61c5d9a973fbb89bd56866a148e. But I don't understand the real difference that distinguishes them. Before that commit, what would have been the difference between as_ly_scm_list (lvalue) and ly_scm_list (lvalue)? Thanks, Jean
