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!

Author: bors

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) {