Followup fixes that I missed during an earlier rebase.

Author: pnkfelix

src/librustc/middle/infer/region_inference/graphviz.rs

@@ -20,8 +20,8 @@ use graphviz as dot;
 
 use middle::ty;
 use super::Constraint;
-use middle::typeck::infer::SubregionOrigin;
-use middle::typeck::infer::region_inference::RegionVarBindings;
+use middle::infer::SubregionOrigin;
+use middle::infer::region_inference::RegionVarBindings;
 use session::config;
 use util::nodemap::{FnvHashMap, FnvHashSet};
 use util::ppaux::Repr;

src/librustc/middle/infer/region_inference/mod.rs

@@ -40,7 +40,7 @@ mod doc;
 mod graphviz;
 
 // A constraint that influences the inference process.
-#[deriving(PartialEq, Eq, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, Hash, Show)]
 pub enum Constraint {
     // One region variable is subregion of another
     ConstrainVarSubVar(RegionVid, RegionVid),