libsyntax: Remove `@const` from the language

2 files changed, 13 insertions, 1 deletions

diff --git a/src/libsyntax/parse/obsolete.rs b/src/libsyntax/parse/obsolete.rs
index f5e83a1beae..573f90af020 100644
--- a/src/libsyntax/parse/obsolete.rs
+++ b/src/libsyntax/parse/obsolete.rs
@@ -58,6 +58,7 @@ pub enum ObsoleteSyntax {
     ObsoleteMode,
     ObsoleteImplicitSelf,
     ObsoleteLifetimeNotation,
+    ObsoleteConstManagedPointer,
 }
 
 impl to_bytes::IterBytes for ObsoleteSyntax {
@@ -193,6 +194,10 @@ pub impl Parser {
                 "instead of `&foo/bar`, write `&'foo bar`; instead of \
                  `bar/&foo`, write `&bar<'foo>"
             ),
+            ObsoleteConstManagedPointer => (
+                "const `@` pointer",
+                "instead of `@const Foo`, write `@Foo`"
+            ),
         };
 
         self.report(sp, kind, kind_str, desc);
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 421c1805f6a..95f8afd538a 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -79,7 +79,7 @@ use parse::obsolete::{ObsoleteRecordType, ObsoleteRecordPattern};
 use parse::obsolete::{ObsoleteAssertion, ObsoletePostFnTySigil};
 use parse::obsolete::{ObsoleteBareFnType, ObsoleteNewtypeEnum};
 use parse::obsolete::{ObsoleteMode, ObsoleteImplicitSelf};
-use parse::obsolete::{ObsoleteLifetimeNotation};
+use parse::obsolete::{ObsoleteLifetimeNotation, ObsoleteConstManagedPointer};
 use parse::prec::{as_prec, token_to_binop};
 use parse::token::{can_begin_expr, is_ident, is_ident_or_path};
 use parse::token::{is_plain_ident, INTERPOLATED, special_idents};
@@ -710,6 +710,9 @@ pub impl Parser {
         if mt.mutbl != m_imm && sigil == OwnedSigil {
             self.obsolete(*self.last_span, ObsoleteMutOwnedPointer);
         }
+        if mt.mutbl == m_const && sigil == ManagedSigil {
+            self.obsolete(*self.last_span, ObsoleteConstManagedPointer);
+        }
 
         ctor(mt)
     }
@@ -1636,6 +1639,10 @@ pub impl Parser {
           token::AT => {
             self.bump();
             let m = self.parse_mutability();
+            if m == m_const {
+                self.obsolete(*self.last_span, ObsoleteConstManagedPointer);
+            }
+
             let e = self.parse_prefix_expr();
             hi = e.span.hi;
             // HACK: turn @[...] into a @-evec