expose ParamEnv as a param

src/librustc/traits/trans/mod.rs

@@ -19,7 +19,7 @@
 use std::marker::PhantomData;
 use syntax::ast;
 use syntax_pos::Span;
-use traits::{FulfillmentContext, Obligation, ObligationCause, Reveal, SelectionContext, Vtable};
+use traits::{FulfillmentContext, Obligation, ObligationCause, SelectionContext, Vtable};
 use ty::{self, Ty, TyCtxt};
 use ty::subst::{Subst, Substs};
 use ty::fold::{TypeFoldable, TypeFolder};
@@ -33,12 +33,12 @@ impl<'a, 'tcx> TyCtxt<'a, 'tcx, 'tcx> {
     /// obligations *could be* resolved if we wanted to.
     pub fn trans_fulfill_obligation(self,
                                     span: Span,
+                                    param_env: ty::ParamEnv<'tcx>,
                                     trait_ref: ty::PolyTraitRef<'tcx>)
                                     -> Vtable<'tcx, ()>
     {
         // Remove any references to regions; this helps improve caching.
         let trait_ref = self.erase_regions(&trait_ref);
-        let param_env = ty::ParamEnv::empty(Reveal::All);
 
         self.trans_trait_caches.trait_cache.memoize((param_env, trait_ref), || {
             debug!("trans::fulfill_obligation(trait_ref={:?}, def_id={:?})",

src/librustc_trans/monomorphize.rs

@@ -112,7 +112,7 @@ fn resolve_associated_item<'a, 'tcx>(
            def_id, trait_id, rcvr_substs);
 
     let trait_ref = ty::TraitRef::from_method(tcx, trait_id, rcvr_substs);
-    let vtbl = tcx.trans_fulfill_obligation(DUMMY_SP, ty::Binder(trait_ref));
+    let vtbl = tcx.trans_fulfill_obligation(DUMMY_SP, ty::ParamEnv::empty(traits::Reveal::All), ty::Binder(trait_ref));
 
     // Now that we know which impl is being used, we can dispatch to
     // the actual function:
@@ -226,7 +226,7 @@ pub fn custom_coerce_unsize_info<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
         substs: tcx.mk_substs_trait(source_ty, &[target_ty])
     });
 
-    match tcx.trans_fulfill_obligation(DUMMY_SP, trait_ref) {
+    match tcx.trans_fulfill_obligation(DUMMY_SP, ty::ParamEnv::empty(traits::Reveal::All), trait_ref) {
         traits::VtableImpl(traits::VtableImplData { impl_def_id, .. }) => {
             tcx.coerce_unsized_info(impl_def_id).custom_kind.unwrap()
         }