Auto merge of #34004 - Manishearth:rollup, r=Manishearth

Rollup of 11 pull requests

- Successful merges: #33385, #33606, #33841, #33892, #33896, #33915, #33921, #33967, #33970, #33973, #33977
- Failed merges:

Author: bors

src/doc/footer.inc

@@ -1,5 +1,5 @@
 <footer><p>
-Copyright &copy; 2011-2015 The Rust Project Developers. Licensed under the
+Copyright &copy; 2011 The Rust Project Developers. Licensed under the
 <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>
 or the <a href="https://opensource.org/licenses/MIT">MIT license</a>, at your option.
 </p><p>

src/libcollections/fmt.rs

@@ -8,19 +8,16 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Utilities for formatting and printing strings
+//! Utilities for formatting and printing `String`s
 //!
 //! This module contains the runtime support for the `format!` syntax extension.
 //! This macro is implemented in the compiler to emit calls to this module in
-//! order to format arguments at runtime into strings and streams.
+//! order to format arguments at runtime into strings.
 //!
 //! # Usage
 //!
 //! The `format!` macro is intended to be familiar to those coming from C's
-//! printf/fprintf functions or Python's `str.format` function. In its current
-//! revision, the `format!` macro returns a `String` type which is the result of
-//! the formatting. In the future it will also be able to pass in a stream to
-//! format arguments directly while performing minimal allocations.
+//! printf/fprintf functions or Python's `str.format` function.
 //!
 //! Some examples of the `format!` extension are:
 //!

src/libcore/slice.rs

@@ -1830,6 +1830,9 @@ impl<A> SlicePartialEq<A> for [A]
         if self.len() != other.len() {
             return false;
         }
+        if self.as_ptr() == other.as_ptr() {
+            return true;
+        }
         unsafe {
             let size = mem::size_of_val(self);
             memcmp(self.as_ptr() as *const u8,

src/libcore/str/mod.rs

@@ -354,7 +354,7 @@ fn unwrap_or_0(opt: Option<&u8>) -> u8 {
 /// UTF-8-like encoding).
 #[unstable(feature = "str_internals", issue = "0")]
 #[inline]
-pub fn next_code_point(bytes: &mut slice::Iter<u8>) -> Option<u32> {
+pub fn next_code_point<'a, I: Iterator<Item = &'a u8>>(bytes: &mut I) -> Option<u32> {
     // Decode UTF-8
     let x = match bytes.next() {
         None => return None,
@@ -388,7 +388,8 @@ pub fn next_code_point(bytes: &mut slice::Iter<u8>) -> Option<u32> {
 /// Reads the last code point out of a byte iterator (assuming a
 /// UTF-8-like encoding).
 #[inline]
-fn next_code_point_reverse(bytes: &mut slice::Iter<u8>) -> Option<u32> {
+fn next_code_point_reverse<'a,
+                           I: DoubleEndedIterator<Item = &'a u8>>(bytes: &mut I) -> Option<u32> {
     // Decode UTF-8
     let w = match bytes.next_back() {
         None => return None,

src/librustc/middle/stability.rs

@@ -26,7 +26,7 @@ use syntax::parse::token::InternedString;
 use syntax::codemap::{Span, DUMMY_SP};
 use syntax::ast;
 use syntax::ast::{NodeId, Attribute};
-use syntax::feature_gate::{GateIssue, emit_feature_err};
+use syntax::feature_gate::{GateIssue, emit_feature_err, find_lang_feature_accepted_version};
 use syntax::attr::{self, Stability, Deprecation, AttrMetaMethods};
 use util::nodemap::{DefIdMap, FnvHashSet, FnvHashMap};
 
@@ -37,6 +37,7 @@ use hir::pat_util::EnumerateAndAdjustIterator;
 
 use std::mem::replace;
 use std::cmp::Ordering;
+use std::ops::Deref;
 
 #[derive(RustcEncodable, RustcDecodable, PartialEq, PartialOrd, Clone, Copy, Debug, Eq, Hash)]
 pub enum StabilityLevel {
@@ -322,7 +323,7 @@ impl<'a, 'tcx> Index<'tcx> {
 /// features and possibly prints errors. Returns a list of all
 /// features used.
 pub fn check_unstable_api_usage<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>)
-                                          -> FnvHashMap<InternedString, StabilityLevel> {
+                                          -> FnvHashMap<InternedString, attr::StabilityLevel> {
     let _task = tcx.dep_graph.in_task(DepNode::StabilityCheck);
     let ref active_lib_features = tcx.sess.features.borrow().declared_lib_features;
 
@@ -343,7 +344,7 @@ pub fn check_unstable_api_usage<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>)
 struct Checker<'a, 'tcx: 'a> {
     tcx: TyCtxt<'a, 'tcx, 'tcx>,
     active_features: FnvHashSet<InternedString>,
-    used_features: FnvHashMap<InternedString, StabilityLevel>,
+    used_features: FnvHashMap<InternedString, attr::StabilityLevel>,
     // Within a block where feature gate checking can be skipped.
     in_skip_block: u32,
 }
@@ -367,7 +368,8 @@ impl<'a, 'tcx> Checker<'a, 'tcx> {
 
         match *stab {
             Some(&Stability { level: attr::Unstable {ref reason, issue}, ref feature, .. }) => {
-                self.used_features.insert(feature.clone(), Unstable);
+                self.used_features.insert(feature.clone(),
+                                          attr::Unstable { reason: reason.clone(), issue: issue });
 
                 if !self.active_features.contains(feature) {
                     let msg = match *reason {
@@ -380,7 +382,7 @@ impl<'a, 'tcx> Checker<'a, 'tcx> {
                 }
             }
             Some(&Stability { ref level, ref feature, .. }) => {
-                self.used_features.insert(feature.clone(), StabilityLevel::from_attr_level(level));
+                self.used_features.insert(feature.clone(), level.clone());
 
                 // Stable APIs are always ok to call and deprecated APIs are
                 // handled by a lint.
@@ -716,28 +718,32 @@ impl<'a, 'tcx> TyCtxt<'a, 'tcx, 'tcx> {
 /// libraries, identify activated features that don't exist and error about them.
 pub fn check_unused_or_stable_features(sess: &Session,
                                        lib_features_used: &FnvHashMap<InternedString,
-                                                                      StabilityLevel>) {
+                                                                      attr::StabilityLevel>) {
     let ref declared_lib_features = sess.features.borrow().declared_lib_features;
     let mut remaining_lib_features: FnvHashMap<InternedString, Span>
         = declared_lib_features.clone().into_iter().collect();
 
-    let stable_msg = "this feature is stable. attribute no longer needed";
+    fn format_stable_since_msg(version: &str) -> String {
+        format!("this feature has been stable since {}. Attribute no longer needed", version)
+    }
 
-    for &span in &sess.features.borrow().declared_stable_lang_features {
+    for &(ref stable_lang_feature, span) in &sess.features.borrow().declared_stable_lang_features {
+        let version = find_lang_feature_accepted_version(stable_lang_feature.deref())
+            .expect("unexpectedly couldn't find version feature was stabilized");
         sess.add_lint(lint::builtin::STABLE_FEATURES,
                       ast::CRATE_NODE_ID,
                       span,
-                      stable_msg.to_string());
+                      format_stable_since_msg(version));
     }
 
     for (used_lib_feature, level) in lib_features_used {
         match remaining_lib_features.remove(used_lib_feature) {
             Some(span) => {
-                if *level == Stable {
+                if let &attr::StabilityLevel::Stable { since: ref version } = level {
                     sess.add_lint(lint::builtin::STABLE_FEATURES,
                                   ast::CRATE_NODE_ID,
                                   span,
-                                  stable_msg.to_string());
+                                  format_stable_since_msg(version.deref()));
                 }
             }
             None => ( /* used but undeclared, handled during the previous ast visit */ )

src/librustc/ty/context.rs

@@ -665,7 +665,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
     /// reference to the context, to allow formatting values that need it.
     pub fn create_and_enter<F, R>(s: &'tcx Session,
                                   arenas: &'tcx CtxtArenas<'tcx>,
-                                  def_map: RefCell<DefMap>,
+                                  def_map: DefMap,
                                   named_region_map: resolve_lifetime::NamedRegionMap,
                                   map: ast_map::Map<'tcx>,
                                   freevars: FreevarMap,
@@ -693,7 +693,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
             item_variance_map: RefCell::new(DepTrackingMap::new(dep_graph.clone())),
             variance_computed: Cell::new(false),
             sess: s,
-            def_map: def_map,
+            def_map: RefCell::new(def_map),
             tables: RefCell::new(Tables::empty()),
             impl_trait_refs: RefCell::new(DepTrackingMap::new(dep_graph.clone())),
             trait_defs: RefCell::new(DepTrackingMap::new(dep_graph.clone())),

src/librustc_driver/driver.rs

@@ -44,7 +44,6 @@ use super::Compilation;
 
 use serialize::json;
 
-use std::cell::RefCell;
 use std::collections::HashMap;
 use std::env;
 use std::ffi::{OsString, OsStr};
@@ -893,7 +892,7 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,
     let trait_map = resolutions.trait_map;
     TyCtxt::create_and_enter(sess,
                              arenas,
-                             RefCell::new(resolutions.def_map),
+                             resolutions.def_map,
                              named_region_map,
                              hir_map,
                              resolutions.freevars,

src/librustc_driver/test.rs

@@ -29,7 +29,6 @@ use rustc_metadata::cstore::CStore;
 use rustc_metadata::creader::read_local_crates;
 use rustc::hir::map as hir_map;
 use rustc::session::{self, config};
-use std::cell::RefCell;
 use std::rc::Rc;
 use syntax::ast;
 use syntax::abi::Abi;
@@ -140,7 +139,7 @@ fn test_env<F>(source_string: &str,
     let index = stability::Index::new(&ast_map);
     TyCtxt::create_and_enter(&sess,
                              &arenas,
-                             RefCell::new(resolutions.def_map),
+                             resolutions.def_map,
                              named_region_map.unwrap(),
                              ast_map,
                              resolutions.freevars,

src/librustc_mir/transform/type_check.rs

@@ -118,10 +118,6 @@ impl<'a, 'b, 'gcx, 'tcx> TypeVerifier<'a, 'b, 'gcx, 'tcx> {
         self.cx.infcx.tcx
     }
 
-    fn infcx(&self) -> &'a InferCtxt<'a, 'gcx, 'tcx> {
-        self.cx.infcx
-    }
-
     fn sanitize_type(&mut self, parent: &fmt::Debug, ty: Ty<'tcx>) -> Ty<'tcx> {
         if ty.needs_infer() || ty.has_escaping_regions() || ty.references_error() {
             span_mirbug_and_err!(self, parent, "bad type {:?}", ty)
@@ -292,30 +288,11 @@ impl<'a, 'b, 'gcx, 'tcx> TypeVerifier<'a, 'b, 'gcx, 'tcx> {
         };
 
         if let Some(field) = variant.fields.get(field.index()) {
-            Ok(self.normalize(field.ty(tcx, substs)))
+            Ok(self.cx.normalize(&field.ty(tcx, substs)))
         } else {
             Err(FieldAccessError::OutOfRange { field_count: variant.fields.len() })
         }
     }
-
-    fn normalize(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> {
-        let infcx = self.infcx();
-        let mut selcx = traits::SelectionContext::new(infcx);
-        let cause = traits::ObligationCause::misc(self.last_span, 0);
-        let traits::Normalized { value: ty, obligations } =
-            traits::normalize(&mut selcx, cause, &ty);
-
-        debug!("normalize: ty={:?} obligations={:?}",
-               ty,
-               obligations);
-
-        let mut fulfill_cx = &mut self.cx.fulfillment_cx;
-        for obligation in obligations {
-            fulfill_cx.register_predicate_obligation(infcx, obligation);
-        }
-
-        ty
-    }
 }
 
 pub struct TypeChecker<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
@@ -373,7 +350,7 @@ impl<'a, 'gcx, 'tcx> TypeChecker<'a, 'gcx, 'tcx> {
         }
     }
 
-    fn check_terminator(&self,
+    fn check_terminator(&mut self,
                         mir: &Mir<'tcx>,
                         term: &Terminator<'tcx>) {
         debug!("check_terminator: {:?}", term);
@@ -431,6 +408,7 @@ impl<'a, 'gcx, 'tcx> TypeChecker<'a, 'gcx, 'tcx> {
                     }
                 };
                 let sig = tcx.erase_late_bound_regions(&func_ty.sig);
+                let sig = self.normalize(&sig);
                 self.check_call_dest(mir, term, &sig, destination);
 
                 if self.is_box_free(func) {
@@ -558,6 +536,27 @@ impl<'a, 'gcx, 'tcx> TypeChecker<'a, 'gcx, 'tcx> {
         }
     }
 
+
+    fn normalize<T>(&mut self, value: &T) -> T
+        where T: fmt::Debug + TypeFoldable<'tcx>
+    {
+        let mut selcx = traits::SelectionContext::new(self.infcx);
+        let cause = traits::ObligationCause::misc(self.last_span, 0);
+        let traits::Normalized { value, obligations } =
+            traits::normalize(&mut selcx, cause, value);
+
+        debug!("normalize: value={:?} obligations={:?}",
+               value,
+               obligations);
+
+        let mut fulfill_cx = &mut self.fulfillment_cx;
+        for obligation in obligations {
+            fulfill_cx.register_predicate_obligation(self.infcx, obligation);
+        }
+
+        value
+    }
+
     fn verify_obligations(&mut self, mir: &Mir<'tcx>) {
         self.last_span = mir.span;
         if let Err(e) = self.fulfillment_cx.select_all_or_error(self.infcx) {

src/librustc_resolve/lib.rs

@@ -2422,13 +2422,16 @@ impl<'a> Resolver<'a> {
                                 }
                             }
                         }
-                    } else if let Err(false) = self.resolve_path(pat_id, &path, 0, ValueNS) {
-                        resolve_error(
-                            self,
-                            path.span,
-                            ResolutionError::UnresolvedEnumVariantStructOrConst(
-                                &path.segments.last().unwrap().identifier.name.as_str())
-                        );
+                    } else {
+                        if let Err(false) = self.resolve_path(pat_id, &path, 0, ValueNS) {
+                            // No error has been reported, so we need to do this ourselves.
+                            resolve_error(
+                                self,
+                                path.span,
+                                ResolutionError::UnresolvedEnumVariantStructOrConst(
+                                    &path.segments.last().unwrap().identifier.name.as_str())
+                            );
+                        }
                         self.record_def(pattern.id, err_path_resolution());
                     }
                     visit::walk_path(self, path);

src/libstd/io/cursor.rs

@@ -230,6 +230,7 @@ impl<T> BufRead for Cursor<T> where T: AsRef<[u8]> {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a> Write for Cursor<&'a mut [u8]> {
+    #[inline]
     fn write(&mut self, data: &[u8]) -> io::Result<usize> {
         let pos = cmp::min(self.pos, self.inner.len() as u64);
         let amt = (&mut self.inner[(pos as usize)..]).write(data)?;
@@ -269,6 +270,7 @@ impl Write for Cursor<Vec<u8>> {
 
 #[stable(feature = "cursor_box_slice", since = "1.5.0")]
 impl Write for Cursor<Box<[u8]>> {
+    #[inline]
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         let pos = cmp::min(self.pos, self.inner.len() as u64);
         let amt = (&mut self.inner[(pos as usize)..]).write(buf)?;

src/libsyntax/ext/tt/macro_rules.rs

@@ -179,15 +179,15 @@ fn generic_extension<'cx>(cx: &'cx ExtCtxt,
     for (i, lhs) in lhses.iter().enumerate() { // try each arm's matchers
         let lhs_tt = match *lhs {
             TokenTree::Delimited(_, ref delim) => &delim.tts[..],
-            _ => cx.span_fatal(sp, "malformed macro lhs")
+            _ => cx.span_bug(sp, "malformed macro lhs")
         };
 
         match TokenTree::parse(cx, lhs_tt, arg) {
             Success(named_matches) => {
                 let rhs = match rhses[i] {
                     // ignore delimiters
                     TokenTree::Delimited(_, ref delimed) => delimed.tts.clone(),
-                    _ => cx.span_fatal(sp, "malformed macro rhs"),
+                    _ => cx.span_bug(sp, "malformed macro rhs"),
                 };
                 // rhs has holes ( `$id` and `$(...)` that need filled)
                 let trncbr = new_tt_reader(&cx.parse_sess().span_diagnostic,
@@ -326,19 +326,14 @@ pub fn compile<'cx>(cx: &'cx mut ExtCtxt,
     NormalTT(exp, Some(def.span), def.allow_internal_unstable)
 }
 
-// why is this here? because of https://github.com/rust-lang/rust/issues/27774
-fn ref_slice<A>(s: &A) -> &[A] { use std::slice::from_raw_parts; unsafe { from_raw_parts(s, 1) } }
-
 fn check_lhs_nt_follows(cx: &mut ExtCtxt, lhs: &TokenTree) -> bool {
     // lhs is going to be like TokenTree::Delimited(...), where the
     // entire lhs is those tts. Or, it can be a "bare sequence", not wrapped in parens.
     match lhs {
         &TokenTree::Delimited(_, ref tts) => check_matcher(cx, &tts.tts),
-        tt @ &TokenTree::Sequence(..) => check_matcher(cx, ref_slice(tt)),
         _ => {
-            cx.span_err(lhs.get_span(),
-                        "invalid macro matcher; matchers must be contained \
-                         in balanced delimiters or a repetition indicator");
+            cx.span_err(lhs.get_span(), "invalid macro matcher; matchers must \
+                                         be contained in balanced delimiters");
             false
         }
     }