auto merge of #10657 : sanxiyn/rust/pat, r=cmr

src/librustc/middle/borrowck/check_loans.rs

@@ -51,7 +51,7 @@ fn visit_local(&mut self, l:@ast::Local, _:()) {
     fn visit_block(&mut self, b:&ast::Block, _:()) {
         check_loans_in_block(self, b);
     }
-    fn visit_pat(&mut self, p:@ast::Pat, _:()) {
+    fn visit_pat(&mut self, p:&ast::Pat, _:()) {
         check_loans_in_pat(self, p);
     }
     fn visit_fn(&mut self, fk:&visit::fn_kind, fd:&ast::fn_decl,
@@ -847,7 +847,7 @@ fn check_loans_in_expr<'a>(this: &mut CheckLoanCtxt<'a>,
 }
 
 fn check_loans_in_pat<'a>(this: &mut CheckLoanCtxt<'a>,
-                          pat: @ast::Pat)
+                          pat: &ast::Pat)
 {
     this.check_for_conflicting_loans(pat.id);
     this.check_move_out_from_id(pat.id, pat.span);

src/librustc/middle/borrowck/gather_loans/mod.rs

@@ -87,7 +87,7 @@ fn visit_fn(&mut self, fk:&fn_kind, fd:&fn_decl, b:&Block,
     fn visit_stmt(&mut self, s:@Stmt, _:()) {
         add_stmt_to_map(self, s);
     }
-    fn visit_pat(&mut self, p:@Pat, _:()) {
+    fn visit_pat(&mut self, p:&Pat, _:()) {
         add_pat_to_id_range(self, p);
     }
     fn visit_local(&mut self, l:@Local, _:()) {
@@ -119,7 +119,7 @@ pub fn gather_loans(bccx: &BorrowckCtxt,
 }
 
 fn add_pat_to_id_range(this: &mut GatherLoanCtxt,
-                       p: @ast::Pat) {
+                       p: &ast::Pat) {
     // NB: This visitor function just adds the pat ids into the id
     // range. We gather loans that occur in patterns using the
     // `gather_pat()` method below. Eventually these two should be

src/librustc/middle/check_const.rs

@@ -33,7 +33,7 @@ impl Visitor<bool> for CheckCrateVisitor {
     fn visit_item(&mut self, i:@item, env:bool) {
         check_item(self, self.sess, self.ast_map, self.def_map, i, env);
     }
-    fn visit_pat(&mut self, p:@Pat, env:bool) {
+    fn visit_pat(&mut self, p:&Pat, env:bool) {
         check_pat(self, p, env);
     }
     fn visit_expr(&mut self, ex:@Expr, env:bool) {
@@ -81,7 +81,7 @@ pub fn check_item(v: &mut CheckCrateVisitor,
     }
 }
 
-pub fn check_pat(v: &mut CheckCrateVisitor, p: @Pat, _is_const: bool) {
+pub fn check_pat(v: &mut CheckCrateVisitor, p: &Pat, _is_const: bool) {
     fn is_str(e: @Expr) -> bool {
         match e.node {
             ExprVstore(

src/librustc/middle/lint.rs

@@ -900,7 +900,7 @@ fn check_unsafe_block(cx: &Context, e: &ast::Expr) {
     }
 }
 
-fn check_unused_mut_pat(cx: &Context, p: @ast::Pat) {
+fn check_unused_mut_pat(cx: &Context, p: &ast::Pat) {
     match p.node {
         ast::PatIdent(ast::BindByValue(ast::MutMutable),
                       ref path, _) if pat_util::pat_is_binding(cx.tcx.def_map, p)=> {
@@ -1119,7 +1119,7 @@ fn visit_item(&mut self, it: @ast::item, _: ()) {
         }
     }
 
-    fn visit_pat(&mut self, p: @ast::Pat, _: ()) {
+    fn visit_pat(&mut self, p: &ast::Pat, _: ()) {
         check_pat_non_uppercase_statics(self, p);
         check_unused_mut_pat(self, p);
 

src/librustc/middle/moves.rs

@@ -459,8 +459,6 @@ fn has_dtor(tcx: ty::ctxt, ty: ty::t) -> bool {
             }
 
             ExprMatch(discr, ref arms) => {
-                // We must do this first so that `arms_have_by_move_bindings`
-                // below knows which bindings are moves.
                 for arm in arms.iter() {
                     self.consume_arm(arm);
                 }
@@ -657,27 +655,6 @@ pub fn use_fn_arg(&mut self, arg_expr: @Expr) {
         self.consume_expr(arg_expr)
     }
 
-    pub fn arms_have_by_move_bindings(&mut self,
-                                      moves_map: MovesMap,
-                                      arms: &[Arm])
-                                      -> Option<@Pat> {
-        let mut ret = None;
-        for arm in arms.iter() {
-            for &pat in arm.pats.iter() {
-                let cont = do ast_util::walk_pat(pat) |p| {
-                    if moves_map.contains(&p.id) {
-                        ret = Some(p);
-                        false
-                    } else {
-                        true
-                    }
-                };
-                if !cont { return ret }
-            }
-        }
-        ret
-    }
-
     pub fn compute_captures(&mut self, fn_expr_id: NodeId) -> @[CaptureVar] {
         debug!("compute_capture_vars(fn_expr_id={:?})", fn_expr_id);
         let _indenter = indenter();

src/librustc/middle/pat_util.rs

@@ -20,7 +20,7 @@
 
 // This is used because same-named variables in alternative patterns need to
 // use the NodeId of their namesake in the first pattern.
-pub fn pat_id_map(dm: resolve::DefMap, pat: @Pat) -> PatIdMap {
+pub fn pat_id_map(dm: resolve::DefMap, pat: &Pat) -> PatIdMap {
     let mut map = HashMap::new();
     do pat_bindings(dm, pat) |_bm, p_id, _s, n| {
       map.insert(path_to_ident(n), p_id);
@@ -52,7 +52,7 @@ pub fn pat_is_const(dm: resolve::DefMap, pat: &Pat) -> bool {
     }
 }
 
-pub fn pat_is_binding(dm: resolve::DefMap, pat: @Pat) -> bool {
+pub fn pat_is_binding(dm: resolve::DefMap, pat: &Pat) -> bool {
     match pat.node {
         PatIdent(*) => {
             !pat_is_variant_or_struct(dm, pat) &&
@@ -62,7 +62,7 @@ pub fn pat_is_binding(dm: resolve::DefMap, pat: @Pat) -> bool {
     }
 }
 
-pub fn pat_is_binding_or_wild(dm: resolve::DefMap, pat: @Pat) -> bool {
+pub fn pat_is_binding_or_wild(dm: resolve::DefMap, pat: &Pat) -> bool {
     match pat.node {
         PatIdent(*) => pat_is_binding(dm, pat),
         PatWild | PatWildMulti => true,
@@ -73,7 +73,7 @@ pub fn pat_is_binding_or_wild(dm: resolve::DefMap, pat: @Pat) -> bool {
 /// Call `it` on every "binding" in a pattern, e.g., on `a` in
 /// `match foo() { Some(a) => (), None => () }`
 pub fn pat_bindings(dm: resolve::DefMap,
-                    pat: @Pat,
+                    pat: &Pat,
                     it: |BindingMode, NodeId, Span, &Path|) {
     do walk_pat(pat) |p| {
         match p.node {
@@ -86,7 +86,7 @@ pub fn pat_bindings(dm: resolve::DefMap,
     };
 }
 
-pub fn pat_binding_ids(dm: resolve::DefMap, pat: @Pat) -> ~[NodeId] {
+pub fn pat_binding_ids(dm: resolve::DefMap, pat: &Pat) -> ~[NodeId] {
     let mut found = ~[];
     pat_bindings(dm, pat, |_bm, b_id, _sp, _pt| found.push(b_id) );
     return found;
@@ -94,7 +94,7 @@ pub fn pat_binding_ids(dm: resolve::DefMap, pat: @Pat) -> ~[NodeId] {
 
 /// Checks if the pattern contains any patterns that bind something to
 /// an ident, e.g. `foo`, or `Foo(foo)` or `foo @ Bar(*)`.
-pub fn pat_contains_bindings(dm: resolve::DefMap, pat: @Pat) -> bool {
+pub fn pat_contains_bindings(dm: resolve::DefMap, pat: &Pat) -> bool {
     let mut contains_bindings = false;
     do walk_pat(pat) |p| {
         if pat_is_binding(dm, p) {

src/librustc/middle/privacy.rs

@@ -739,7 +739,7 @@ fn visit_view_item(&mut self, a: &ast::view_item, _: ()) {
         }
     }
 
-    fn visit_pat(&mut self, pattern: @ast::Pat, _: ()) {
+    fn visit_pat(&mut self, pattern: &ast::Pat, _: ()) {
         match pattern.node {
             ast::PatStruct(_, ref fields, _) => {
                 match ty::get(ty::pat_ty(self.tcx, pattern)).sty {

src/librustc/middle/region.rs

@@ -340,7 +340,7 @@ fn resolve_arm(visitor: &mut RegionResolutionVisitor,
 }
 
 fn resolve_pat(visitor: &mut RegionResolutionVisitor,
-               pat: @ast::Pat,
+               pat: &ast::Pat,
                cx: Context) {
     assert_eq!(cx.var_parent, cx.parent);
     parent_to_expr(visitor, cx, pat.id, pat.span);
@@ -480,7 +480,7 @@ fn visit_fn(&mut self, fk:&fn_kind, fd:&fn_decl, b:&Block, s:Span, n:NodeId, cx:
     fn visit_arm(&mut self, a:&Arm, cx:Context) {
         resolve_arm(self, a, cx);
     }
-    fn visit_pat(&mut self, p:@Pat, cx:Context) {
+    fn visit_pat(&mut self, p:&Pat, cx:Context) {
         resolve_pat(self, p, cx);
     }
     fn visit_stmt(&mut self, s:@Stmt, cx:Context) {

src/librustc/middle/typeck/check/mod.rs

@@ -375,7 +375,7 @@ fn visit_local(&mut self, local:@ast::Local, _:()) {
 
     }
         // Add pattern bindings.
-    fn visit_pat(&mut self, p:@ast::Pat, _:()) {
+    fn visit_pat(&mut self, p:&ast::Pat, _:()) {
             match p.node {
               ast::PatIdent(_, ref path, _)
                   if pat_util::pat_is_binding(self.fcx.ccx.tcx.def_map, p) => {

src/librustc/middle/typeck/check/writeback.rs

@@ -278,7 +278,7 @@ fn visit_block(b: &ast::Block, wbcx: &mut WbCtxt) {
     visit::walk_block(wbcx, b, ());
 }
 
-fn visit_pat(p: @ast::Pat, wbcx: &mut WbCtxt) {
+fn visit_pat(p: &ast::Pat, wbcx: &mut WbCtxt) {
     if !wbcx.success {
         return;
     }
@@ -323,7 +323,7 @@ impl Visitor<()> for WbCtxt {
     fn visit_stmt(&mut self, s:@ast::Stmt, _:()) { visit_stmt(s, self); }
     fn visit_expr(&mut self, ex:@ast::Expr, _:()) { visit_expr(ex, self); }
     fn visit_block(&mut self, b:&ast::Block, _:()) { visit_block(b, self); }
-    fn visit_pat(&mut self, p:@ast::Pat, _:()) { visit_pat(p, self); }
+    fn visit_pat(&mut self, p:&ast::Pat, _:()) { visit_pat(p, self); }
     fn visit_local(&mut self, l:@ast::Local, _:()) { visit_local(l, self); }
 }
 

src/libsyntax/ast_map.rs

@@ -242,7 +242,7 @@ fn map_block(&mut self, b: &Block) {
         visit::walk_block(self, b, ());
     }
 
-    fn map_pat(&mut self, pat: @Pat) {
+    fn map_pat(&mut self, pat: &Pat) {
         match pat.node {
             PatIdent(_, ref path, _) => {
                 // Note: this is at least *potentially* a pattern...
@@ -345,7 +345,7 @@ fn visit_item(&mut self, i: @item, _: ()) {
         self.path.pop();
     }
 
-    fn visit_pat(&mut self, pat: @Pat, _: ()) {
+    fn visit_pat(&mut self, pat: &Pat, _: ()) {
         self.map_pat(pat);
         visit::walk_pat(self, pat, ())
     }

src/libsyntax/ast_util.rs

@@ -497,7 +497,7 @@ fn visit_stmt(&mut self, statement: @Stmt, env: ()) {
         visit::walk_stmt(self, statement, env)
     }
 
-    fn visit_pat(&mut self, pattern: @Pat, env: ()) {
+    fn visit_pat(&mut self, pattern: &Pat, env: ()) {
         self.operation.visit_id(pattern.id);
         visit::walk_pat(self, pattern, env)
     }
@@ -636,7 +636,7 @@ pub fn is_item_impl(item: @ast::item) -> bool {
     }
 }
 
-pub fn walk_pat(pat: @Pat, it: |@Pat| -> bool) -> bool {
+pub fn walk_pat(pat: &Pat, it: |&Pat| -> bool) -> bool {
     if !it(pat) {
         return false;
     }

src/libsyntax/ext/expand.rs

@@ -612,7 +612,7 @@ struct NewNameFinderContext {
 }
 
 impl Visitor<()> for NewNameFinderContext {
-    fn visit_pat(&mut self, pattern: @ast::Pat, _: ()) {
+    fn visit_pat(&mut self, pattern: &ast::Pat, _: ()) {
         match *pattern {
             // we found a pat_ident!
             ast::Pat {

src/libsyntax/visit.rs

@@ -78,7 +78,7 @@ fn visit_local(&mut self, l:@Local, e:E) { walk_local(self, l, e) }
     fn visit_block(&mut self, b:&Block, e:E) { walk_block(self, b, e) }
     fn visit_stmt(&mut self, s:@Stmt, e:E) { walk_stmt(self, s, e) }
     fn visit_arm(&mut self, a:&Arm, e:E) { walk_arm(self, a, e) }
-    fn visit_pat(&mut self, p:@Pat, e:E) { walk_pat(self, p, e) }
+    fn visit_pat(&mut self, p:&Pat, e:E) { walk_pat(self, p, e) }
     fn visit_decl(&mut self, d:@Decl, e:E) { walk_decl(self, d, e) }
     fn visit_expr(&mut self, ex:@Expr, e:E) { walk_expr(self, ex, e) }
     fn visit_expr_post(&mut self, _ex:@Expr, _e:E) { }