Feature gate box syntax#20723

Merged

bors merged 15 commits intorust-lang:masterfrom

pnkfelix:feature-gate-box-syntax

Jan 8, 2015

Commits on Jan 7, 2015

Add `Box::new` method. Prereq for feature-gating `box <expr>` itself.
pnkfelix
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Added `box_syntax` feature gate; added to std and rustc crates for bootstrap.
pnkfelix
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Allow unknown features to bootstrap rustc with box_syntax feature.
pnkfelix
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run-pass tests: Add feature attributes to enable box pat/expr syntax in various tests.
pnkfelix
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compile-fail tests: Add feature attributes to enable box pat/expr syntax in various tests.
pnkfelix
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alternate version of coerce-match test that avoids box syntax.
pnkfelix
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Test that box syntax, both in expressions and patterns, is caught by
pnkfelix
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Switch to using `Box::new` in the tests in `alloc::boxed`.
pnkfelix
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allow unknown features in the log crate.
pnkfelix
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