Remove another unused error variant

Author: oli-obk

src/librustc/ich/impls_ty.rs

@@ -524,7 +524,6 @@ for ::middle::const_val::ErrKind<'gcx> {
         mem::discriminant(self).hash_stable(hcx, hasher);
 
         match *self {
-            NonConstPath |
             TypeckError |
             CouldNotResolve |
             CheckMatchError => {

src/librustc/middle/const_val.rs

@@ -39,7 +39,6 @@ pub struct ConstEvalErr<'tcx> {
 #[derive(Clone, Debug, RustcEncodable, RustcDecodable)]
 pub enum ErrKind<'tcx> {
 
-    NonConstPath,
     CouldNotResolve,
     TypeckError,
     CheckMatchError,
@@ -82,7 +81,6 @@ impl<'a, 'gcx, 'tcx> ConstEvalErr<'tcx> {
         }
 
         match *self.kind {
-            NonConstPath        => simple!("non-constant path in constant expression"),
             CouldNotResolve => simple!("could not resolve"),
             TypeckError => simple!("type-checking failed"),
             CheckMatchError => simple!("match-checking failed"),

src/librustc/ty/structural_impls.rs

@@ -594,7 +594,6 @@ impl<'a, 'tcx> Lift<'tcx> for const_val::ErrKind<'a> {
         use middle::const_val::ErrKind::*;
 
         Some(match *self {
-            NonConstPath => NonConstPath,
             CouldNotResolve => CouldNotResolve,
             TypeckError => TypeckError,
             CheckMatchError => CheckMatchError,