val apply_subst_context : fix_projections:bool ->
NCic.substitution -> NCic.context -> NCic.context
val apply_subst_metasenv : NCic.substitution -> NCic.metasenv -> NCic.metasenv
val apply_subst_context : fix_projections:bool ->
NCic.substitution -> NCic.context -> NCic.context
val apply_subst_metasenv : NCic.substitution -> NCic.metasenv -> NCic.metasenv