make some things a bit more private

src/librustc_mir/const_eval.rs

@@ -77,7 +77,7 @@ pub fn mk_eval_cx<'a, 'tcx>(
     Ok(ecx)
 }
 
-pub fn eval_promoted<'a, 'mir, 'tcx>(
+pub(crate) fn eval_promoted<'a, 'mir, 'tcx>(
     tcx: TyCtxt<'a, 'tcx, 'tcx>,
     cid: GlobalId<'tcx>,
     mir: &'mir mir::Mir<'tcx>,

src/librustc_mir/interpret/eval_context.rs

@@ -41,10 +41,10 @@ pub struct EvalContext<'a, 'mir, 'tcx: 'a + 'mir, M: Machine<'a, 'mir, 'tcx>> {
     pub machine: M,
 
     /// The results of the type checker, from rustc.
-    pub tcx: TyCtxtAt<'a, 'tcx, 'tcx>,
+    pub(crate) tcx: TyCtxtAt<'a, 'tcx, 'tcx>,
 
     /// Bounds in scope for polymorphic evaluations.
-    pub param_env: ty::ParamEnv<'tcx>,
+    pub(crate) param_env: ty::ParamEnv<'tcx>,
 
     /// The virtual memory system.
     pub memory: Memory<'a, 'mir, 'tcx, M>,

src/librustc_mir/interpret/memory.rs

@@ -57,7 +57,8 @@ pub struct Memory<'a, 'mir, 'tcx: 'a + 'mir, M: Machine<'a, 'mir, 'tcx>> {
     /// that do not exist any more.
     dead_alloc_map: FxHashMap<AllocId, (Size, Align)>,
 
-    pub tcx: TyCtxtAt<'a, 'tcx, 'tcx>,
+    /// Lets us implement `HasDataLayout`, which is awfully convenient.
+    pub(super) tcx: TyCtxtAt<'a, 'tcx, 'tcx>,
 }
 
 impl<'b, 'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>> HasDataLayout