Allow *-pointers in PtrTy (fixes rust-lang#16781)

src/libsyntax/ext/build.rs

@@ -52,6 +52,9 @@ pub trait AstBuilder {
                ty: P<ast::Ty>,
                lifetime: Option<ast::Lifetime>,
                mutbl: ast::Mutability) -> P<ast::Ty>;
+    fn ty_ptr(&self, span: Span,
+              ty: P<ast::Ty>,
+              mutbl: ast::Mutability) -> P<ast::Ty>;
     fn ty_uniq(&self, span: Span, ty: P<ast::Ty>) -> P<ast::Ty>;
 
     fn ty_option(&self, ty: P<ast::Ty>) -> P<ast::Ty>;
@@ -369,6 +372,14 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
                 ast::TyRptr(lifetime, self.ty_mt(ty, mutbl)))
     }
 
+    fn ty_ptr(&self,
+              span: Span,
+              ty: P<ast::Ty>,
+              mutbl: ast::Mutability)
+        -> P<ast::Ty> {
+        self.ty(span,
+                ast::TyPtr(self.ty_mt(ty, mutbl)))
+    }
     fn ty_uniq(&self, span: Span, ty: P<ast::Ty>) -> P<ast::Ty> {
         self.ty(span, ast::TyUniq(ty))
     }

src/libsyntax/ext/deriving/generic/ty.rs

@@ -28,6 +28,8 @@ use std::gc::Gc;
 pub enum PtrTy<'a> {
     /// &'lifetime mut
     Borrowed(Option<&'a str>, ast::Mutability),
+    /// *mut
+    Raw(ast::Mutability),
 }
 
 /// A path, e.g. `::std::option::Option::<int>` (global). Has support
@@ -82,7 +84,7 @@ impl<'a> Path<'a> {
     }
 }
 
-/// A type. Supports pointers (except for *), Self, and literals
+/// A type. Supports pointers, Self, and literals
 #[deriving(Clone)]
 pub enum Ty<'a> {
     Self,
@@ -143,6 +145,7 @@ impl<'a> Ty<'a> {
                         let lt = mk_lifetime(cx, span, lt);
                         cx.ty_rptr(span, raw_ty, lt, mutbl)
                     }
+                    Raw(mutbl) => cx.ty_ptr(span, raw_ty, mutbl)
                 }
             }
             Literal(ref p) => { p.to_ty(cx, span, self_ty, self_generics) }
@@ -273,6 +276,7 @@ pub fn get_explicit_self(cx: &ExtCtxt, span: Span, self_ptr: &Option<PtrTy>)
                         let lt = lt.map(|s| cx.lifetime(span, cx.ident_of(s).name));
                         ast::SelfRegion(lt, mutbl, special_idents::self_)
                     }
+                    Raw(_) => cx.span_bug(span, "attempted to use *self in deriving definition")
                 });
             let self_expr = cx.expr_deref(span, self_path);
             (self_expr, self_ty)