Update to rustfmt-preview (#348)
* Update to rustfmt-preview. * Run "cargo fmt --all" with rustfmt 0.4.1. rustfmt 0.4.1 is the latest release of rustfmt-preview available on the stable channel. * Fix a long line that rustfmt 0.4.1 can't handle. * Remove unneeded commas left behind by rustfmt.
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@@ -22,9 +22,9 @@
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use constant_hash::{probe, simple_hash};
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use isa::TargetIsa;
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use std::boxed::Box;
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use std::fmt;
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use std::result;
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use std::boxed::Box;
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use std::str;
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/// A string-based configurator for settings groups.
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