Generalized base::unsized_info

src/librustc_codegen_llvm/interfaces/backend.rs

@@ -8,11 +8,22 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+use rustc::ty::layout::{HasTyCtxt, LayoutOf, TyLayout};
+use rustc::ty::Ty;
 use std::fmt::Debug;
 
-pub trait Backend {
+pub trait BackendTypes {
     type Value: Debug + PartialEq + Copy;
     type BasicBlock;
     type Type: Debug + PartialEq + Copy;
     type Context;
 }
+
+pub trait Backend<'tcx>:
+    BackendTypes + HasTyCtxt<'tcx> + LayoutOf<Ty = Ty<'tcx>, TyLayout = TyLayout<'tcx>>
+{
+}
+
+impl<'tcx, T> Backend<'tcx> for T where
+    Self: BackendTypes + HasTyCtxt<'tcx> + LayoutOf<Ty = Ty<'tcx>, TyLayout = TyLayout<'tcx>>
+{}