---

yaml
---
r: 223661
b: refs/heads/beta
c: 445824b
h: refs/heads/master
i:
  223659: 59ecd3b
v: v3

Author: Ariel Ben-Yehuda

[refs]

@@ -23,7 +23,7 @@ refs/tags/0.9: 36870b185fc5f5486636d4515f0e22677493f225
 refs/tags/0.10: ac33f2b15782272ae348dbd7b14b8257b2148b5a
 refs/tags/0.11.0: e1247cb1d0d681be034adb4b558b5a0c0d5720f9
 refs/tags/0.12.0: f0c419429ef30723ceaf6b42f9b5a2aeb5d2e2d1
-refs/heads/beta: e6a9be10bc1b178dc0b23c505fc8f17e925cabb2
+refs/heads/beta: 445824b29f5ee9a218f315f8cf56142f089e71d0
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
 refs/heads/tmp: 938f5d7af401e2d8238522fed4a612943b6e77fd
 refs/tags/1.0.0-alpha.2: 4c705f6bc559886632d3871b04f58aab093bfa2f

branches/beta/src/doc/trpl/concurrency.md

@@ -10,12 +10,11 @@ system is up to the task, and gives you powerful ways to reason about
 concurrent code at compile time.
 
 Before we talk about the concurrency features that come with Rust, it's important
-to understand something: Rust is low-level enough that the vast majority of
-this is provided by the standard library, not by the language. This means that
-if you don't like some aspect of the way Rust handles concurrency, you can
-implement an alternative way of doing things.
-[mio](https://github.com/carllerche/mio) is a real-world example of this
-principle in action.
+to understand something: Rust is low-level enough that all of this is provided
+by the standard library, not by the language. This means that if you don't like
+some aspect of the way Rust handles concurrency, you can implement an alternative
+way of doing things. [mio](https://github.com/carllerche/mio) is a real-world
+example of this principle in action.
 
 ## Background: `Send` and `Sync`
 

branches/beta/src/doc/trpl/lifetimes.md

@@ -101,8 +101,6 @@ the lifetime `'a` has snuck in between the `&` and the `mut i32`. We read `&mut
 i32` as ‘a mutable reference to an i32’ and `&'a mut i32` as ‘a mutable
 reference to an `i32` with the lifetime `'a`’.
 
-# In `struct`s
-
 You’ll also need explicit lifetimes when working with [`struct`][structs]s:
 
 ```rust
@@ -139,33 +137,6 @@ x: &'a i32,
 uses it. So why do we need a lifetime here? We need to ensure that any reference
 to a `Foo` cannot outlive the reference to an `i32` it contains.
 
-## `impl` blocks
-
-Let’s implement a method on `Foo`:
-
-```rust
-struct Foo<'a> {
-    x: &'a i32,
-}
-
-impl<'a> Foo<'a> {
-    fn x(&self) -> &'a i32 { self.x }
-}
-
-fn main() {
-    let y = &5; // this is the same as `let _y = 5; let y = &_y;`
-    let f = Foo { x: y };
-
-    println!("x is: {}", f.x());
-}
-```
-
-As you can see, we need to declare a lifetime for `Foo` in the `impl` line. We repeat
-`'a` twice, just like on functions: `impl<'a>` defines a lifetime `'a`, and `Foo<'a>`
-uses it.
-
-## Multiple lifetimes
-
 If you have multiple references, you can use the same lifetime multiple times:
 
 ```rust

branches/beta/src/doc/trpl/unsafe.md

@@ -8,7 +8,7 @@ this, Rust has a keyword, `unsafe`. Code using `unsafe` has less restrictions
 than normal code does.
 
 Let’s go over the syntax, and then we’ll talk semantics. `unsafe` is used in
-four contexts. The first one is to mark a function as unsafe:
+two contexts. The first one is to mark a function as unsafe:
 
 ```rust
 unsafe fn danger_will_robinson() {
@@ -27,40 +27,15 @@ unsafe {
 }
 ```
 
-The third is for unsafe traits:
-
-```rust
-unsafe trait Scary { }
-```
-
-And the fourth is for `impl`ementing one of those traits:
-
-```rust
-# unsafe trait Scary { }
-unsafe impl Scary for i32 {}
-```
-
 It’s important to be able to explicitly delineate code that may have bugs that
 cause big problems. If a Rust program segfaults, you can be sure it’s somewhere
 in the sections marked `unsafe`.
 
 # What does ‘safe’ mean?
 
-Safe, in the context of Rust, means ‘doesn’t do anything unsafe’. It’s also
-important to know that there are certain behaviors that are probably not
-desirable in your code, but are expressly _not_ unsafe:
+Safe, in the context of Rust, means “doesn’t do anything unsafe.” Easy!
 
-* Deadlocks
-* Leaks of memory or other resources
-* Exiting without calling destructors
-* Integer overflow
-
-Rust cannot prevent all kinds of software problems. Buggy code can and will be
-written in Rust. These things aren’t great, but they don’t qualify as `unsafe`
-specifically.
-
-In addition, the following are all undefined behaviors in Rust, and must be
-avoided, even when writing `unsafe` code:
+Okay, let’s try again: what is not safe to do? Here’s a list:
 
 * Data races
 * Dereferencing a null/dangling raw pointer
@@ -89,6 +64,18 @@ avoided, even when writing `unsafe` code:
 [undef]: http://llvm.org/docs/LangRef.html#undefined-values
 [aliasing]: http://llvm.org/docs/LangRef.html#pointer-aliasing-rules
 
+Whew! That’s a bunch of stuff. It’s also important to notice all kinds of
+behaviors that are certainly bad, but are expressly _not_ unsafe:
+
+* Deadlocks
+* Leaks of memory or other resources
+* Exiting without calling destructors
+* Integer overflow
+
+Rust cannot prevent all kinds of software problems. Buggy code can and will be
+written in Rust. These things aren’t great, but they don’t qualify as `unsafe`
+specifically.
+
 # Unsafe Superpowers
 
 In both unsafe functions and unsafe blocks, Rust will let you do three things

branches/beta/src/librustc/middle/cfg/construct.rs

@@ -332,7 +332,7 @@ impl<'a, 'tcx> CFGBuilder<'a, 'tcx> {
             }
 
             ast::ExprIndex(ref l, ref r) |
-            ast::ExprBinary(_, ref l, ref r) if self.is_method_call(expr) => {
+            ast::ExprBinary(_, ref l, ref r) if self.tcx.is_method_call(expr.id) => {
                 self.call(expr, pred, &**l, Some(&**r).into_iter())
             }
 
@@ -342,7 +342,7 @@ impl<'a, 'tcx> CFGBuilder<'a, 'tcx> {
                 self.straightline(expr, pred, fields)
             }
 
-            ast::ExprUnary(_, ref e) if self.is_method_call(expr) => {
+            ast::ExprUnary(_, ref e) if self.tcx.is_method_call(expr.id) => {
                 self.call(expr, pred, &**e, None::<ast::Expr>.iter())
             }
 
@@ -631,9 +631,4 @@ impl<'a, 'tcx> CFGBuilder<'a, 'tcx> {
             }
         }
     }
-
-    fn is_method_call(&self, expr: &ast::Expr) -> bool {
-        let method_call = ty::MethodCall::expr(expr.id);
-        self.tcx.tables.borrow().method_map.contains_key(&method_call)
-    }
 }

branches/beta/src/librustc/middle/stability.rs

@@ -289,19 +289,15 @@ impl<'a, 'tcx> Checker<'a, 'tcx> {
         if !cross_crate { return }
 
         match *stab {
-            Some(&Stability { level: attr::Unstable, ref feature, ref reason, issue, .. }) => {
+            Some(&Stability { level: attr::Unstable, ref feature, ref reason, .. }) => {
                 self.used_features.insert(feature.clone(), attr::Unstable);
 
                 if !self.active_features.contains(feature) {
-                    let mut msg = match *reason {
+                    let msg = match *reason {
                         Some(ref r) => format!("use of unstable library feature '{}': {}",
                                                &feature, &r),
                         None => format!("use of unstable library feature '{}'", &feature)
                     };
-                    if let Some(n) = issue {
-                        use std::fmt::Write;
-                        write!(&mut msg, " (see issue #{})", n).unwrap();
-                    }
 
                     emit_feature_err(&self.tcx.sess.parse_sess.span_diagnostic,
                                       &feature, span, &msg);

branches/beta/src/librustc/middle/ty.rs

@@ -6631,6 +6631,11 @@ impl<'tcx> ctxt<'tcx> {
         self.tables.borrow().method_map.contains_key(&MethodCall::expr(expr_id))
     }
 
+    pub fn is_overloaded_autoderef(&self, expr_id: ast::NodeId, autoderefs: u32) -> bool {
+        self.tables.borrow().method_map.contains_key(&MethodCall::autoderef(expr_id,
+                                                                            autoderefs))
+    }
+
     pub fn upvar_capture(&self, upvar_id: ty::UpvarId) -> Option<ty::UpvarCapture> {
         Some(self.tables.borrow().upvar_capture_map.get(&upvar_id).unwrap().clone())
     }

branches/beta/src/librustc_driver/driver.rs

@@ -547,7 +547,7 @@ pub fn phase_2_configure_and_expand(sess: &Session,
                                                   sess.diagnostic()));
 
     krate = time(time_passes, "prelude injection", krate, |krate|
-                 syntax::std_inject::maybe_inject_prelude(&sess.parse_sess, krate));
+                 syntax::std_inject::maybe_inject_prelude(krate));
 
     time(time_passes, "checking that all macro invocations are gone", &krate, |krate|
          syntax::ext::expand::check_for_macros(&sess.parse_sess, krate));

branches/beta/src/librustc_trans/trans/expr.rs

@@ -367,8 +367,7 @@ fn apply_adjustments<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
                 match datum.ty.sty {
                     // Don't skip a conversion from Box<T> to &T, etc.
                     ty::TyRef(..) => {
-                        let method_call = MethodCall::autoderef(expr.id, 0);
-                        if bcx.tcx().tables.borrow().method_map.contains_key(&method_call) {
+                        if bcx.tcx().is_overloaded_autoderef(expr.id, 0) {
                             // Don't skip an overloaded deref.
                             0
                         } else {
@@ -1612,9 +1611,7 @@ fn trans_unary<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
     // The only overloaded operator that is translated to a datum
     // is an overloaded deref, since it is always yields a `&T`.
     // Otherwise, we should be in the RvalueDpsExpr path.
-    assert!(
-        op == ast::UnDeref ||
-        !ccx.tcx().tables.borrow().method_map.contains_key(&method_call));
+    assert!(op == ast::UnDeref || !ccx.tcx().is_method_call(expr.id));
 
     let un_ty = expr_ty(bcx, expr);
 
@@ -1907,7 +1904,7 @@ fn trans_binary<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
     let ccx = bcx.ccx();
 
     // if overloaded, would be RvalueDpsExpr
-    assert!(!ccx.tcx().tables.borrow().method_map.contains_key(&MethodCall::expr(expr.id)));
+    assert!(!ccx.tcx().is_method_call(expr.id));
 
     match op.node {
         ast::BiAnd => {
@@ -2141,7 +2138,7 @@ fn trans_assign_op<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
     debug!("trans_assign_op(expr={:?})", expr);
 
     // User-defined operator methods cannot be used with `+=` etc right now
-    assert!(!bcx.tcx().tables.borrow().method_map.contains_key(&MethodCall::expr(expr.id)));
+    assert!(!bcx.tcx().is_method_call(expr.id));
 
     // Evaluate LHS (destination), which should be an lvalue
     let dst_datum = unpack_datum!(bcx, trans_to_lvalue(bcx, dst, "assign_op"));
@@ -2606,7 +2603,7 @@ enum ExprKind {
 }
 
 fn expr_kind(tcx: &ty::ctxt, expr: &ast::Expr) -> ExprKind {
-    if tcx.tables.borrow().method_map.contains_key(&MethodCall::expr(expr.id)) {
+    if tcx.is_method_call(expr.id) {
         // Overloaded operations are generally calls, and hence they are
         // generated via DPS, but there are a few exceptions:
         return match expr.node {

branches/beta/src/librustc_typeck/check/regionck.rs

@@ -516,8 +516,7 @@ fn visit_expr(rcx: &mut Rcx, expr: &ast::Expr) {
     type_must_outlive(rcx, infer::ExprTypeIsNotInScope(expr_ty, expr.span),
                       expr_ty, ty::ReScope(CodeExtent::from_node_id(expr.id)));
 
-    let method_call = MethodCall::expr(expr.id);
-    let has_method_map = rcx.fcx.inh.tables.borrow().method_map.contains_key(&method_call);
+    let has_method_map = rcx.fcx.infcx().is_method_call(expr.id);
 
     // Check any autoderefs or autorefs that appear.
     let adjustment = rcx.fcx.inh.tables.borrow().adjustments.get(&expr.id).map(|a| a.clone());

branches/beta/src/librustc_typeck/diagnostics.rs

@@ -1368,62 +1368,6 @@ struct Foo {
 ```
 "##,
 
-E0128: r##"
-Type parameter defaults can only use parameters that occur before them.
-Erroneous code example:
-
-```
-pub struct Foo<T=U, U=()> {
-    field1: T,
-    filed2: U,
-}
-// error: type parameters with a default cannot use forward declared
-// identifiers
-```
-
-Since type parameters are evaluated in-order, you may be able to fix this issue
-by doing:
-
-```
-pub struct Foo<U=(), T=U> {
-    field1: T,
-    filed2: U,
-}
-```
-
-Please also verify that this wasn't because of a name-clash and rename the type
-parameter if so.
-"##,
-
-E0130: r##"
-You declared a pattern as an argument in a foreign function declaration.
-Erroneous code example:
-
-```
-extern {
-    fn foo((a, b): (u32, u32)); // error: patterns aren't allowed in foreign
-                                //        function declarations
-}
-```
-
-Please replace the pattern argument with a regular one. Example:
-
-```
-struct SomeStruct {
-    a: u32,
-    b: u32,
-}
-
-extern {
-    fn foo(s: SomeStruct); // ok!
-}
-// or
-extern {
-    fn foo(a: (u32, u32)); // ok!
-}
-```
-"##,
-
 E0131: r##"
 It is not possible to define `main` with type parameters, or even with function
 parameters. When `main` is present, it must take no arguments and return `()`.
@@ -1438,30 +1382,6 @@ fn(isize, *const *const u8) -> isize
 ```
 "##,
 
-E0159: r##"
-You tried to use a trait as a struct constructor. Erroneous code example:
-
-```
-trait TraitNotAStruct {}
-
-TraitNotAStruct{ value: 0 }; // error: use of trait `TraitNotAStruct` as a
-                             //        struct constructor
-```
-
-Please verify you used the correct type name or please implement the trait
-on a struct and use this struct constructor. Example:
-
-```
-trait TraitNotAStruct {}
-
-struct Foo {
-    value: i32
-}
-
-Foo{ value: 0 }; // ok!
-```
-"##,
-
 E0166: r##"
 This error means that the compiler found a return expression in a function
 marked as diverging. A function diverges if it has `!` in the place of the
@@ -1547,7 +1467,6 @@ impl Foo for Bar {
     // the impl
     fn foo() {}
 }
-```
 "##,
 
 E0192: r##"
@@ -2059,8 +1978,11 @@ register_diagnostics! {
     E0122,
     E0123,
     E0127,
+    E0128,
     E0129,
+    E0130,
     E0141,
+    E0159,
     E0163,
     E0164,
     E0167,