diff --git a/src/libcollections/btree/map.rs b/src/libcollections/btree/map.rs
index ee4b66b043c..1c484d5dd5e 100644
--- a/src/libcollections/btree/map.rs
+++ b/src/libcollections/btree/map.rs
@@ -1587,21 +1587,12 @@ impl<K: Ord, V> BTreeMap<K, V> {
/// ```
/// # #![feature(collections)]
/// use std::collections::BTreeMap;
- /// use std::collections::btree_map::Entry;
///
/// let mut count: BTreeMap<&str, usize> = BTreeMap::new();
///
/// // count the number of occurrences of letters in the vec
- /// for x in vec!["a","b","a","c","a","b"].iter() {
- /// match count.entry(*x) {
- /// Entry::Vacant(view) => {
- /// view.insert(1);
- /// },
- /// Entry::Occupied(mut view) => {
- /// let v = view.get_mut();
- /// *v += 1;
- /// },
- /// }
+ /// for x in vec!["a","b","a","c","a","b"] {
+ /// *count.entry(x).default(0) += 1;
/// }
///
/// assert_eq!(count["a"], 3);
diff --git a/src/libcollections/vec_map.rs b/src/libcollections/vec_map.rs
index c73caccef80..94dd997947c 100644
--- a/src/libcollections/vec_map.rs
+++ b/src/libcollections/vec_map.rs
@@ -632,21 +632,12 @@ impl<V> VecMap<V> {
/// ```
/// # #![feature(collections)]
/// use std::collections::VecMap;
- /// use std::collections::vec_map::Entry;
///
/// let mut count: VecMap<u32> = VecMap::new();
///
/// // count the number of occurrences of numbers in the vec
- /// for x in vec![1, 2, 1, 2, 3, 4, 1, 2, 4].iter() {
- /// match count.entry(*x) {
- /// Entry::Vacant(view) => {
- /// view.insert(1);
- /// },
- /// Entry::Occupied(mut view) => {
- /// let v = view.get_mut();
- /// *v += 1;
- /// },
- /// }
+ /// for x in vec![1, 2, 1, 2, 3, 4, 1, 2, 4] {
+ /// *count.entry(x).default(0) += 1;
/// }
///
/// assert_eq!(count[1], 3);
diff --git a/src/librustc/metadata/loader.rs b/src/librustc/metadata/loader.rs
index 7854db81146..a36d425c03e 100644
--- a/src/librustc/metadata/loader.rs
+++ b/src/librustc/metadata/loader.rs
@@ -426,8 +426,7 @@ impl<'a> Context<'a> {
info!("lib candidate: {}", path.display());
let hash_str = hash.to_string();
- let slot = candidates.entry(hash_str).get().unwrap_or_else(
- |vacant_entry| vacant_entry.insert((HashMap::new(), HashMap::new())));
+ let slot = candidates.entry(hash_str).default_with(|| (HashMap::new(), HashMap::new()));
let (ref mut rlibs, ref mut dylibs) = *slot;
if rlib {
rlibs.insert(fs::realpath(path).unwrap(), kind);
diff --git a/src/librustc/middle/dataflow.rs b/src/librustc/middle/dataflow.rs
index a1ce8d18184..71b36e21d3e 100644
--- a/src/librustc/middle/dataflow.rs
+++ b/src/librustc/middle/dataflow.rs
@@ -160,12 +160,7 @@ fn build_nodeid_to_index(decl: Option<&ast::FnDecl>,
cfg.graph.each_node(|node_idx, node| {
if let cfg::CFGNodeData::AST(id) = node.data {
- match index.entry(id).get() {
- Ok(v) => v.push(node_idx),
- Err(e) => {
- e.insert(vec![node_idx]);
- }
- }
+ index.entry(id).default(vec![]).push(node_idx);
}
true
});
@@ -185,12 +180,7 @@ fn build_nodeid_to_index(decl: Option<&ast::FnDecl>,
visit::walk_fn_decl(&mut formals, decl);
impl<'a, 'v> visit::Visitor<'v> for Formals<'a> {
fn visit_pat(&mut self, p: &ast::Pat) {
- match self.index.entry(p.id).get() {
- Ok(v) => v.push(self.entry),
- Err(e) => {
- e.insert(vec![self.entry]);
- }
- }
+ self.index.entry(p.id).default(vec![]).push(self.entry);
visit::walk_pat(self, p)
}
}
diff --git a/src/librustc/middle/traits/fulfill.rs b/src/librustc/middle/traits/fulfill.rs
index c1066aa899e..76050d53a74 100644
--- a/src/librustc/middle/traits/fulfill.rs
+++ b/src/librustc/middle/traits/fulfill.rs
@@ -11,7 +11,6 @@
use middle::infer::{InferCtxt};
use middle::ty::{self, RegionEscape, Ty};
use std::collections::HashSet;
-use std::collections::hash_map::Entry::{Occupied, Vacant};
use std::default::Default;
use syntax::ast;
use util::common::ErrorReported;
@@ -437,9 +436,7 @@ fn register_region_obligation<'tcx>(tcx: &ty::ctxt<'tcx>,
debug!("register_region_obligation({})",
region_obligation.repr(tcx));
- match region_obligations.entry(region_obligation.cause.body_id) {
- Vacant(entry) => { entry.insert(vec![region_obligation]); },
- Occupied(mut entry) => { entry.get_mut().push(region_obligation); },
- }
+ region_obligations.entry(region_obligation.cause.body_id).default(vec![])
+ .push(region_obligation);
}
diff --git a/src/librustc/middle/ty.rs b/src/librustc/middle/ty.rs
index 92b444e85d8..975d1560d6c 100644
--- a/src/librustc/middle/ty.rs
+++ b/src/librustc/middle/ty.rs
@@ -5669,9 +5669,7 @@ pub fn lookup_field_type<'tcx>(tcx: &ctxt<'tcx>,
node_id_to_type(tcx, id.node)
} else {
let mut tcache = tcx.tcache.borrow_mut();
- let pty = tcache.entry(id).get().unwrap_or_else(
- |vacant_entry| vacant_entry.insert(csearch::get_field_type(tcx, struct_id, id)));
- pty.ty
+ tcache.entry(id).default_with(|| csearch::get_field_type(tcx, struct_id, id)).ty
};
ty.subst(tcx, substs)
}
@@ -6819,9 +6817,7 @@ pub fn replace_late_bound_regions<'tcx, T, F>(
debug!("region={}", region.repr(tcx));
match region {
ty::ReLateBound(debruijn, br) if debruijn.depth == current_depth => {
- let region =
- * map.entry(br).get().unwrap_or_else(
- |vacant_entry| vacant_entry.insert(mapf(br)));
+ let region = *map.entry(br).default_with(|| mapf(br));
if let ty::ReLateBound(debruijn1, br) = region {
// If the callback returns a late-bound region,
diff --git a/src/librustc/session/config.rs b/src/librustc/session/config.rs
index a7c67a08631..5f0ab104885 100644
--- a/src/librustc/session/config.rs
+++ b/src/librustc/session/config.rs
@@ -35,7 +35,6 @@ use syntax::parse::token::InternedString;
use getopts;
use std::collections::HashMap;
-use std::collections::hash_map::Entry::{Occupied, Vacant};
use std::env;
use std::fmt;
use std::path::PathBuf;
@@ -1037,10 +1036,7 @@ pub fn build_session_options(matches: &getopts::Matches) -> Options {
None => early_error("--extern value must be of the format `foo=bar`"),
};
- match externs.entry(name.to_string()) {
- Vacant(entry) => { entry.insert(vec![location.to_string()]); },
- Occupied(mut entry) => { entry.get_mut().push(location.to_string()); },
- }
+ externs.entry(name.to_string()).default(vec![]).push(location.to_string());
}
let crate_name = matches.opt_str("crate-name");
diff --git a/src/librustc_typeck/check/mod.rs b/src/librustc_typeck/check/mod.rs
index 1e38a7d2d9f..4aa5f09c142 100644
--- a/src/librustc_typeck/check/mod.rs
+++ b/src/librustc_typeck/check/mod.rs
@@ -112,7 +112,6 @@ use util::nodemap::{DefIdMap, FnvHashMap, NodeMap};
use util::lev_distance::lev_distance;
use std::cell::{Cell, Ref, RefCell};
-use std::collections::hash_map::Entry::{Occupied, Vacant};
use std::mem::replace;
use std::rc::Rc;
use std::iter::repeat;
@@ -1362,11 +1361,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
closure_def_id: ast::DefId,
r: DeferredCallResolutionHandler<'tcx>) {
let mut deferred_call_resolutions = self.inh.deferred_call_resolutions.borrow_mut();
- let mut vec = match deferred_call_resolutions.entry(closure_def_id) {
- Occupied(entry) => entry.into_mut(),
- Vacant(entry) => entry.insert(Vec::new()),
- };
- vec.push(r);
+ deferred_call_resolutions.entry(closure_def_id).default(vec![]).push(r);
}
fn remove_deferred_call_resolutions(&self,
diff --git a/src/librustdoc/html/render.rs b/src/librustdoc/html/render.rs
index d57739c4002..5ca31ae26e1 100644
--- a/src/librustdoc/html/render.rs
+++ b/src/librustdoc/html/render.rs
@@ -876,9 +876,7 @@ impl DocFolder for Cache {
if let clean::ImplItem(ref i) = item.inner {
match i.trait_ {
Some(clean::ResolvedPath{ did, .. }) => {
- let v = self.implementors.entry(did).get().unwrap_or_else(
- |vacant_entry| vacant_entry.insert(Vec::with_capacity(1)));
- v.push(Implementor {
+ self.implementors.entry(did).default(vec![]).push(Implementor {
def_id: item.def_id,
generics: i.generics.clone(),
trait_: i.trait_.as_ref().unwrap().clone(),
@@ -1080,9 +1078,7 @@ impl DocFolder for Cache {
};
if let Some(did) = did {
- let v = self.impls.entry(did).get().unwrap_or_else(
- |vacant_entry| vacant_entry.insert(Vec::with_capacity(1)));
- v.push(Impl {
+ self.impls.entry(did).default(vec![]).push(Impl {
impl_: i,
dox: dox,
stability: item.stability.clone(),
@@ -1334,9 +1330,8 @@ impl Context {
Some(ref s) => s.to_string(),
};
let short = short.to_string();
- let v = map.entry(short).get().unwrap_or_else(
- |vacant_entry| vacant_entry.insert(Vec::with_capacity(1)));
- v.push((myname, Some(plain_summary_line(item.doc_value()))));
+ map.entry(short).default(vec![])
+ .push((myname, Some(plain_summary_line(item.doc_value()))));
}
for (_, items) in &mut map {
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 9f1d876432c..4db5a262c2c 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -352,9 +352,7 @@ fn parse_externs(matches: &getopts::Matches) -> Result<core::Externs, String> {
}
};
let name = name.to_string();
- let locs = externs.entry(name).get().unwrap_or_else(
- |vacant_entry| vacant_entry.insert(Vec::with_capacity(1)));
- locs.push(location.to_string());
+ externs.entry(name).default(vec![]).push(location.to_string());
}
Ok(externs)
}
diff --git a/src/libstd/collections/mod.rs b/src/libstd/collections/mod.rs
index 8d24f6b1916..b51948c160b 100644
--- a/src/libstd/collections/mod.rs
+++ b/src/libstd/collections/mod.rs
@@ -307,10 +307,7 @@
//! let message = "she sells sea shells by the sea shore";
//!
//! for c in message.chars() {
-//! match count.entry(c) {
-//! Entry::Vacant(entry) => { entry.insert(1); },
-//! Entry::Occupied(mut entry) => *entry.get_mut() += 1,
-//! }
+//! *count.entry(c).default(0) += 1;
//! }
//!
//! assert_eq!(count.get(&'s'), Some(&8));
@@ -343,10 +340,7 @@
//! for id in orders.into_iter() {
//! // If this is the first time we've seen this customer, initialize them
//! // with no blood alcohol. Otherwise, just retrieve them.
-//! let person = match blood_alcohol.entry(id) {
-//! Entry::Vacant(entry) => entry.insert(Person{id: id, blood_alcohol: 0.0}),
-//! Entry::Occupied(entry) => entry.into_mut(),
-//! };
+//! let person = blood_alcohol.entry(id).default(Person{id: id, blood_alcohol: 0.0});
//!
//! // Reduce their blood alcohol level. It takes time to order and drink a beer!
//! person.blood_alcohol *= 0.9;
diff --git a/src/libsyntax/ext/mtwt.rs b/src/libsyntax/ext/mtwt.rs
index 72431d8e6aa..2b811ce914f 100644
--- a/src/libsyntax/ext/mtwt.rs
+++ b/src/libsyntax/ext/mtwt.rs
@@ -66,9 +66,8 @@ pub fn apply_mark(m: Mrk, ctxt: SyntaxContext) -> SyntaxContext {
/// Extend a syntax context with a given mark and sctable (explicit memoization)
fn apply_mark_internal(m: Mrk, ctxt: SyntaxContext, table: &SCTable) -> SyntaxContext {
let key = (ctxt, m);
- * table.mark_memo.borrow_mut().entry(key).get().unwrap_or_else(
- |vacant_entry|
- vacant_entry.insert(idx_push(&mut *table.table.borrow_mut(), Mark(m, ctxt))))
+ * table.mark_memo.borrow_mut().entry(key)
+ .default_with(|| idx_push(&mut *table.table.borrow_mut(), Mark(m, ctxt)))
}
/// Extend a syntax context with a given rename
@@ -84,9 +83,8 @@ fn apply_rename_internal(id: Ident,
table: &SCTable) -> SyntaxContext {
let key = (ctxt, id, to);
- * table.rename_memo.borrow_mut().entry(key).get().unwrap_or_else(
- |vacant_entry|
- vacant_entry.insert(idx_push(&mut *table.table.borrow_mut(), Rename(id, to, ctxt))))
+ * table.rename_memo.borrow_mut().entry(key)
+ .default_with(|| idx_push(&mut *table.table.borrow_mut(), Rename(id, to, ctxt)))
}
/// Apply a list of renamings to a context