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Stop relying on linking details of std’s default allocator
We’ve been bitten before by symbol names changing: https://github.com/servo/heapsize/pull/46 and upstream is planning to stop using jemalloc by default: https://github.com/rust-lang/rust/issues/33082#issuecomment-309781465 So use the (relatively) new `#[global_allocator]` attribute to explicitly select the system allocator on Windows and jemalloc (now in an external crate) on other platforms. This choice matches current defaults.
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#![cfg_attr(all(feature = "unstable", not(target_os = "windows")), feature(alloc_jemalloc))]
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#![deny(unsafe_code)]
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#[allow(unused_extern_crates)]
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#[cfg(all(feature = "unstable", not(target_os = "windows")))]
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extern crate alloc_jemalloc;
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extern crate heartbeats_simple;
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extern crate influent;
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extern crate ipc_channel;
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#[allow(unused_extern_crates)]
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#[cfg(all(feature = "unstable", not(target_os = "windows")))]
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extern crate jemalloc_sys;
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#[cfg(not(target_os = "windows"))]
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extern crate libc;
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#[macro_use]
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