Remove ExprSlice by hacking the compiler

[breaking-change]

The `mut` in slices is now redundant. Mutability is 'inferred' from position. This means that if mutability is only obvious from the type, you will need to use explicit calls to the slicing methods.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 28f7a78ddd0..4607520655e 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -307,10 +307,10 @@ impl<'a, 'v> Visitor<'v> for Context<'a> {
 
     fn visit_expr(&mut self, e: &ast::Expr) {
         match e.node {
-            ast::ExprSlice(..) => {
+            ast::ExprRange(..) => {
                 self.gate_feature("slicing_syntax",
                                   e.span,
-                                  "slicing syntax is experimental");
+                                  "range syntax is experimental");
             }
             _ => {}
         }