auto merge of #5143 : erickt/rust/incoming, r=pcwalton

Good morning,

It's taken a long time, but I finally am almost done freeing libsyntax of `vecs_implicitly_copyable` in this pull request, but I'm running into some issues. I've confirmed that all but the last commit (which only disables `vecs_implicitly_copyable` pass the `check` tests. The last commit errors with this message, which makes no sense to me:

```
/Users/erickt/rust/rust/src/libcore/num/f32.rs:35:37: 35:43 error: expected `,` but found `=`
/Users/erickt/rust/rust/src/libcore/num/f32.rs:35         pub pure fn $name($( $arg : $arg_ty ),*) -> $rv {
                                                                                       ^~~~~~
```

and this stack trace:

```
#1  0x00000001000b059b in sys::begin_unwind_::_a923ca4ae164c::_06 ()
#2  0x00000001000b0542 in sys::begin_unwind::anon::anon::expr_fn_13876 ()
#3  0x00000001000048a1 in sys::begin_unwind::_8ec273289fc0adc0::_06 ()
#4  0x00000001005df999 in diagnostic::__extensions__::meth_7941::span_fatal::_efdf2d14612d79ec::_06 ()
#5  0x0000000100682d48 in parse::parser::__extensions__::meth_16938::fatal::_8aa3239426747a3::_06 ()
#6  0x00000001006850b8 in parse::common::__extensions__::meth_17005::expect::_d3604ec6c7698d5f::_06 ()
#7  0x00000001006b59f1 in parse::common::__extensions__::parse_seq_to_before_end_17860::_48c79835f9eb1011::_06 ()
#8  0x00000001006a50f7 in parse::parser::__extensions__::meth_17606::parse_fn_decl::_14f3785fe78967d::_06 ()
#9  0x00000001006b6f59 in parse::parser::__extensions__::meth_17987::parse_item_fn::_8a6be529cf7b2ca5::_06 ()
#10 0x00000001006ac839 in parse::parser::__extensions__::meth_17761::parse_item_or_view_item::_bfead947d6dd7d25::_06 ()
#11 0x00000001006c8b8f in parse::parser::__extensions__::meth_18364::parse_item::_96b54e33f65abe76::_06 ()
#12 0x000000010076179f in ext::tt::macro_rules::add_new_extension::generic_extension::anon::anon::expr_fn_23365 ()
#13 0x000000010072e793 in ext::expand::expand_item_mac::_a4f486c4465cfb1b::_06 ()
#14 0x00000001007b5ad3 in __morestack ()
```

There also a bunch of new warnings that I haven't cleaned up yet: https://gist.github.com/erickt/5048251.

@nikomatsakis thought there might be some scary bug in the parser caused by moving a vector in the parser instead of copying it, which is why I'm filing this pull request before it's ready. Thanks for any help!

src/libfuzzer/fuzzer.rc

@@ -134,7 +134,7 @@ pub pure fn safe_to_use_expr(e: ast::expr, tm: test_mode) -> bool {
 
 pub fn safe_to_steal_ty(t: @ast::Ty, tm: test_mode) -> bool {
     // Restrictions happen to be the same.
-    safe_to_replace_ty(t.node, tm)
+    safe_to_replace_ty(&t.node, tm)
 }
 
 // Not type-parameterized: https://github.com/mozilla/rust/issues/898 (FIXED)
@@ -175,8 +175,8 @@ pub fn steal(crate: ast::crate, tm: test_mode) -> StolenStuff {
 }
 
 
-pub fn safe_to_replace_expr(e: ast::expr_, _tm: test_mode) -> bool {
-    match e {
+pub fn safe_to_replace_expr(e: &ast::expr_, _tm: test_mode) -> bool {
+    match *e {
       // https://github.com/mozilla/rust/issues/652
       ast::expr_if(*) => { false }
       ast::expr_block(_) => { false }
@@ -188,8 +188,8 @@ pub fn safe_to_replace_expr(e: ast::expr_, _tm: test_mode) -> bool {
     }
 }
 
-pub fn safe_to_replace_ty(t: ast::ty_, _tm: test_mode) -> bool {
-    match t {
+pub fn safe_to_replace_ty(t: &ast::ty_, _tm: test_mode) -> bool {
+    match *t {
       ast::ty_infer => { false } // always implicit, always top level
       ast::ty_bot => { false }   // in source, can only appear
                               // as the out type of a function
@@ -204,7 +204,7 @@ pub fn replace_expr_in_crate(crate: ast::crate, i: uint,
    ast::crate {
     let j: @mut uint = @mut 0u;
     fn fold_expr_rep(j_: @mut uint, i_: uint, newexpr_: ast::expr_,
-                     original: ast::expr_, fld: fold::ast_fold,
+                     original: &ast::expr_, fld: fold::ast_fold,
                      tm_: test_mode) ->
        ast::expr_ {
         *j_ += 1u;
@@ -221,7 +221,7 @@ pub fn replace_expr_in_crate(crate: ast::crate, i: uint,
         .. *fold::default_ast_fold()
     };
     let af = fold::make_fold(afp);
-    let crate2: @ast::crate = @af.fold_crate(crate);
+    let crate2: @ast::crate = @af.fold_crate(&crate);
     *crate2
 }
 
@@ -231,7 +231,7 @@ pub fn replace_ty_in_crate(crate: ast::crate, i: uint, newty: ast::Ty,
                            tm: test_mode) -> ast::crate {
     let j: @mut uint = @mut 0u;
     fn fold_ty_rep(j_: @mut uint, i_: uint, newty_: ast::ty_,
-                   original: ast::ty_, fld: fold::ast_fold,
+                   original: &ast::ty_, fld: fold::ast_fold,
                    tm_: test_mode) ->
        ast::ty_ {
         *j_ += 1u;
@@ -244,7 +244,7 @@ pub fn replace_ty_in_crate(crate: ast::crate, i: uint, newty: ast::Ty,
         .. *fold::default_ast_fold()
     };
     let af = fold::make_fold(afp);
-    let crate2: @ast::crate = @af.fold_crate(crate);
+    let crate2: @ast::crate = @af.fold_crate(&crate);
     *crate2
 }
 

src/librustc/driver/driver.rs

@@ -396,7 +396,7 @@ pub fn pretty_print_input(sess: Session, +cfg: ast::crate_cfg, input: input,
           pprust::node_block(s, ref blk) => {
             pp::space(s.s);
             pprust::synth_comment(
-                s, ~"block " + int::to_str((*blk).node.id));
+                s, ~"block " + int::to_str(blk.node.id));
           }
           pprust::node_expr(s, expr) => {
             pp::space(s.s);

src/librustc/driver/session.rs

@@ -358,7 +358,7 @@ pub mod test {
     pub fn make_crate_type_attr(+t: ~str) -> ast::attribute {
         codemap::respan(codemap::dummy_sp(), ast::attribute_ {
             style: ast::attr_outer,
-            value: codemap::respan(codemap::dummy_sp(),
+            value: @codemap::respan(codemap::dummy_sp(),
                 ast::meta_name_value(
                     @~"crate_type",
                     codemap::respan(codemap::dummy_sp(),

src/librustc/front/config.rs

@@ -45,7 +45,7 @@ pub fn strip_items(crate: @ast::crate, in_cfg: in_cfg_pred)
           .. *fold::default_ast_fold()};
 
     let fold = fold::make_fold(precursor);
-    let res = @fold.fold_crate(*crate);
+    let res = @fold.fold_crate(&*crate);
     return res;
 }
 
@@ -63,7 +63,7 @@ fn filter_view_item(cx: @Context, &&view_item: @ast::view_item
     }
 }
 
-fn fold_mod(cx: @Context, m: ast::_mod, fld: fold::ast_fold) -> ast::_mod {
+fn fold_mod(cx: @Context, m: &ast::_mod, fld: fold::ast_fold) -> ast::_mod {
     let filtered_items =
         m.items.filter_mapped(|a| filter_item(cx, *a));
     let filtered_view_items =
@@ -83,7 +83,7 @@ fn filter_foreign_item(cx: @Context, &&item: @ast::foreign_item) ->
 
 fn fold_foreign_mod(
     cx: @Context,
-    nm: ast::foreign_mod,
+    nm: &ast::foreign_mod,
     fld: fold::ast_fold
 ) -> ast::foreign_mod {
     let filtered_items =
@@ -98,21 +98,21 @@ fn fold_foreign_mod(
     }
 }
 
-fn fold_item_underscore(cx: @Context, +item: ast::item_,
+fn fold_item_underscore(cx: @Context, item: &ast::item_,
                         fld: fold::ast_fold) -> ast::item_ {
-    let item = match item {
-        ast::item_impl(a, b, c, methods) => {
+    let item = match *item {
+        ast::item_impl(ref a, b, c, ref methods) => {
             let methods = methods.filtered(|m| method_in_cfg(cx, *m) );
-            ast::item_impl(a, b, c, methods)
+            ast::item_impl(/*bad*/ copy *a, b, c, methods)
         }
         ast::item_trait(ref a, ref b, ref methods) => {
             let methods = methods.filtered(|m| trait_method_in_cfg(cx, m) );
             ast::item_trait(/*bad*/copy *a, /*bad*/copy *b, methods)
         }
-        item => item
+        ref item => /*bad*/ copy *item
     };
 
-    fold::noop_fold_item_underscore(item, fld)
+    fold::noop_fold_item_underscore(&item, fld)
 }
 
 fn filter_stmt(cx: @Context, &&stmt: @ast::stmt) ->
@@ -134,7 +134,7 @@ fn filter_stmt(cx: @Context, &&stmt: @ast::stmt) ->
 
 fn fold_block(
     cx: @Context,
-    b: ast::blk_,
+    b: &ast::blk_,
     fld: fold::ast_fold
 ) -> ast::blk_ {
     let filtered_stmts =

src/librustc/front/core_inject.rs

@@ -50,7 +50,7 @@ fn inject_libcore_ref(sess: Session,
                 attrs: ~[
                     spanned(ast::attribute_ {
                         style: ast::attr_inner,
-                        value: spanned(ast::meta_name_value(
+                        value: @spanned(ast::meta_name_value(
                             @~"vers",
                             spanned(ast::lit_str(@CORE_VERSION.to_str()))
                         )),
@@ -66,10 +66,13 @@ fn inject_libcore_ref(sess: Session,
                 view_items: vis,
                 ../*bad*/copy crate.module
             };
-            new_module = fld.fold_mod(new_module);
+            new_module = fld.fold_mod(&new_module);
 
             // FIXME #2543: Bad copy.
-            let new_crate = ast::crate_ { module: new_module, ..copy crate };
+            let new_crate = ast::crate_ {
+                module: new_module,
+                ..copy *crate
+            };
             (new_crate, span)
         },
         fold_mod: |module, fld| {
@@ -95,12 +98,15 @@ fn inject_libcore_ref(sess: Session,
             let vis = vec::append(~[vi2], module.view_items);
 
             // FIXME #2543: Bad copy.
-            let new_module = ast::_mod { view_items: vis, ..copy module };
-            fold::noop_fold_mod(new_module, fld)
+            let new_module = ast::_mod {
+                view_items: vis,
+                ..copy *module
+            };
+            fold::noop_fold_mod(&new_module, fld)
         },
         ..*fold::default_ast_fold()
     };
 
     let fold = fold::make_fold(precursor);
-    @fold.fold_crate(*crate)
+    @fold.fold_crate(crate)
 }

src/librustc/front/test.rs

@@ -91,7 +91,7 @@ fn generate_test_harness(sess: session::Session,
         fold_mod: |a,b| fold_mod(cx, a, b),.. *fold::default_ast_fold()};
 
     let fold = fold::make_fold(precursor);
-    let res = @fold.fold_crate(*crate);
+    let res = @fold.fold_crate(&*crate);
     cx.ext_cx.bt_pop();
     return res;
 }
@@ -106,7 +106,7 @@ fn strip_test_functions(crate: @ast::crate) -> @ast::crate {
 }
 
 fn fold_mod(cx: @mut TestCtxt,
-            m: ast::_mod,
+            m: &ast::_mod,
             fld: fold::ast_fold)
          -> ast::_mod {
     // Remove any #[main] from the AST so it doesn't clash with
@@ -125,19 +125,21 @@ fn fold_mod(cx: @mut TestCtxt,
         items: vec::map(m.items, |i| nomain(cx, *i)),
     };
 
-    fold::noop_fold_mod(mod_nomain, fld)
+    fold::noop_fold_mod(&mod_nomain, fld)
 }
 
 fn fold_crate(cx: @mut TestCtxt,
-              c: ast::crate_,
+              c: &ast::crate_,
               fld: fold::ast_fold)
            -> ast::crate_ {
     let folded = fold::noop_fold_crate(c, fld);
 
     // Add a special __test module to the crate that will contain code
     // generated for the test harness
-    ast::crate_ { module: add_test_module(cx, /*bad*/copy folded.module),
-                  .. folded }
+    ast::crate_ {
+        module: add_test_module(cx, &folded.module),
+        .. folded
+    }
 }
 
 
@@ -238,11 +240,11 @@ fn should_fail(i: @ast::item) -> bool {
     vec::len(attr::find_attrs_by_name(i.attrs, ~"should_fail")) > 0u
 }
 
-fn add_test_module(cx: &TestCtxt, +m: ast::_mod) -> ast::_mod {
+fn add_test_module(cx: &TestCtxt, m: &ast::_mod) -> ast::_mod {
     let testmod = mk_test_module(cx);
     ast::_mod {
         items: vec::append_one(/*bad*/copy m.items, testmod),
-        .. m
+        .. /*bad*/ copy *m
     }
 }
 

src/librustc/metadata/decoder.rs

@@ -1009,7 +1009,7 @@ fn get_attributes(md: ebml::Doc) -> ~[ast::attribute] {
                 codemap::spanned {
                     node: ast::attribute_ {
                         style: ast::attr_outer,
-                        value: /*bad*/copy *meta_item,
+                        value: meta_item,
                         is_sugared_doc: false,
                     },
                     span: codemap::dummy_sp()

src/librustc/metadata/encoder.rs

@@ -326,7 +326,7 @@ fn encode_path(ecx: @EncodeContext, ebml_w: writer::Encoder,
 }
 
 fn encode_info_for_mod(ecx: @EncodeContext, ebml_w: writer::Encoder,
-                       md: _mod, id: node_id, path: &[ast_map::path_elt],
+                       md: &_mod, id: node_id, path: &[ast_map::path_elt],
                        name: ident) {
     ebml_w.start_tag(tag_items_data_item);
     encode_def_id(ebml_w, local_def(id));
@@ -659,7 +659,7 @@ fn encode_info_for_item(ecx: @EncodeContext, ebml_w: writer::Encoder,
         }
         ebml_w.end_tag();
       }
-      item_mod(m) => {
+      item_mod(ref m) => {
         add_to_index();
         encode_info_for_mod(ecx, ebml_w, m, item.id, path, item.ident);
       }
@@ -912,8 +912,8 @@ fn encode_info_for_item(ecx: @EncodeContext, ebml_w: writer::Encoder,
         // method info, we output static methods with type signatures as
         // written. Here, we output the *real* type signatures. I feel like
         // maybe we should only ever handle the real type signatures.
-        for vec::each((*ms)) |m| {
-            let ty_m = ast_util::trait_method_to_ty_method(*m);
+        for ms.each |m| {
+            let ty_m = ast_util::trait_method_to_ty_method(m);
             if ty_m.self_ty.node != ast::sty_static { loop; }
 
             index.push(entry { val: ty_m.id, pos: ebml_w.writer.tell() });
@@ -995,7 +995,7 @@ fn encode_info_for_items(ecx: @EncodeContext, ebml_w: writer::Encoder,
     let index = @mut ~[];
     ebml_w.start_tag(tag_items_data);
     index.push(entry { val: crate_node_id, pos: ebml_w.writer.tell() });
-    encode_info_for_mod(ecx, ebml_w, crate.node.module,
+    encode_info_for_mod(ecx, ebml_w, &crate.node.module,
                         crate_node_id, ~[],
                         syntax::parse::token::special_idents::invalid);
     visit::visit_crate(*crate, (), visit::mk_vt(@visit::Visitor {
@@ -1088,7 +1088,7 @@ fn write_int(writer: io::Writer, &&n: int) {
     writer.write_be_u32(n as u32);
 }
 
-fn encode_meta_item(ebml_w: writer::Encoder, mi: meta_item) {
+fn encode_meta_item(ebml_w: writer::Encoder, mi: @meta_item) {
     match mi.node {
       meta_word(name) => {
         ebml_w.start_tag(tag_meta_item_word);
@@ -1118,7 +1118,7 @@ fn encode_meta_item(ebml_w: writer::Encoder, mi: meta_item) {
         ebml_w.writer.write(str::to_bytes(*name));
         ebml_w.end_tag();
         for items.each |inner_item| {
-            encode_meta_item(ebml_w, **inner_item);
+            encode_meta_item(ebml_w, *inner_item);
         }
         ebml_w.end_tag();
       }

src/librustc/middle/astencode.rs

@@ -298,7 +298,7 @@ fn encode_ast(ebml_w: writer::Encoder, item: ast::inlined_item) {
 // nested items, as otherwise it would get confused when translating
 // inlined items.
 fn simplify_ast(ii: ast::inlined_item) -> ast::inlined_item {
-    fn drop_nested_items(blk: ast::blk_, fld: fold::ast_fold) -> ast::blk_ {
+    fn drop_nested_items(blk: &ast::blk_, fld: fold::ast_fold) -> ast::blk_ {
         let stmts_sans_items = do blk.stmts.filtered |stmt| {
             match stmt.node {
               ast::stmt_expr(_, _) | ast::stmt_semi(_, _) |
@@ -317,7 +317,7 @@ fn simplify_ast(ii: ast::inlined_item) -> ast::inlined_item {
             id: blk.id,
             rules: blk.rules
         };
-        fold::noop_fold_block(blk_sans_items, fld)
+        fold::noop_fold_block(&blk_sans_items, fld)
     }
 
     let fld = fold::make_fold(@fold::AstFoldFns {
@@ -336,7 +336,7 @@ fn simplify_ast(ii: ast::inlined_item) -> ast::inlined_item {
         ast::ii_foreign(fld.fold_foreign_item(i))
       }
       ast::ii_dtor(ref dtor, nm, ref tps, parent_id) => {
-        let dtor_body = fld.fold_block((*dtor).node.body);
+        let dtor_body = fld.fold_block(&dtor.node.body);
         ast::ii_dtor(
             codemap::spanned {
                 node: ast::struct_dtor_ { body: dtor_body,
@@ -372,8 +372,8 @@ fn renumber_ast(xcx: @ExtendedDecodeContext, ii: ast::inlined_item)
         ast::ii_foreign(fld.fold_foreign_item(i))
       }
       ast::ii_dtor(ref dtor, nm, ref generics, parent_id) => {
-        let dtor_body = fld.fold_block((*dtor).node.body);
-        let dtor_attrs = fld.fold_attributes(copy dtor.node.attrs);
+        let dtor_body = fld.fold_block(&dtor.node.body);
+        let dtor_attrs = fld.fold_attributes(/*bad*/copy (*dtor).node.attrs);
         let new_generics = fold::fold_generics(generics, fld);
         let dtor_id = fld.new_id((*dtor).node.id);
         let new_parent = xcx.tr_def_id(parent_id);

src/librustc/middle/borrowck/check_loans.rs

@@ -579,9 +579,9 @@ pub impl CheckLoanCtxt {
     }
 }
 
-fn check_loans_in_fn(fk: visit::fn_kind,
-                     decl: ast::fn_decl,
-                     body: ast::blk,
+fn check_loans_in_fn(fk: &visit::fn_kind,
+                     decl: &ast::fn_decl,
+                     body: &ast::blk,
                      sp: span,
                      id: ast::node_id,
                      &&self: @mut CheckLoanCtxt,
@@ -590,7 +590,7 @@ fn check_loans_in_fn(fk: visit::fn_kind,
     let fty = ty::node_id_to_type(self.tcx(), id);
 
     let declared_purity;
-    match fk {
+    match *fk {
         visit::fk_item_fn(*) | visit::fk_method(*) |
         visit::fk_dtor(*) => {
             declared_purity = ty::ty_fn_purity(fty);
@@ -611,7 +611,7 @@ fn check_loans_in_fn(fk: visit::fn_kind,
         do save_and_restore_managed(self.fn_args) {
             *self.declared_purity = declared_purity;
 
-            match fk {
+            match *fk {
                 visit::fk_anon(*) |
                 visit::fk_fn_block(*) if is_stack_closure => {
                     // inherits the fn_args from enclosing ctxt
@@ -753,7 +753,7 @@ fn check_loans_in_expr(expr: @ast::expr,
     visit::visit_expr(expr, self, vt);
 }
 
-fn check_loans_in_block(blk: ast::blk,
+fn check_loans_in_block(blk: &ast::blk,
                         &&self: @mut CheckLoanCtxt,
                         vt: visit::vt<@mut CheckLoanCtxt>) {
     do save_and_restore_managed(self.declared_purity) {