add bench feature to fix benchmarks

Author: nikomatsakis

Cargo.toml

@@ -9,6 +9,7 @@ authors = ["Niko Matsakis <niko@alum.mit.edu>"]
 
 [features]
 congruence-closure = [ "petgraph" ]
+bench = [ ]
 
 [dependencies]
 log = "0.3"

measurements.txt

@@ -1,21 +1,6 @@
 base
-test unify::test::big_array_bench ... bench:   1,416,793 ns/iter (+/- 216,475)
+test unify::tests::big_array_bench ... bench:     740,192 ns/iter (+/- 35,823)
+test unify::tests::big_array_bench ... bench:     745,031 ns/iter (+/- 240,463)
+test unify::tests::big_array_bench ... bench:     762,031 ns/iter (+/- 240,463)
+test unify::tests::big_array_bench ... bench:     756,234 ns/iter (+/- 264,710)
 
-assert -> debug_assert
-test unify::test::big_array_bench ... bench:   1,420,368 ns/iter (+/- 144,433)
-test unify::test::big_array_bench ... bench:   1,414,448 ns/iter (+/- 219,137)
-
-don't copy for redirects
-test unify::test::big_array_bench ... bench:   1,349,796 ns/iter (+/- 233,931)
-test unify::test::big_array_bench ... bench:   1,367,082 ns/iter (+/- 301,644)
-test unify::test::big_array_bench ... bench:   1,358,154 ns/iter (+/- 348,796)
-
-copy less
-test unify::test::big_array_bench ... bench:     744,775 ns/iter (+/- 51,865)
-test unify::test::big_array_bench ... bench:     750,939 ns/iter (+/- 146,417)
-test unify::test::big_array_bench ... bench:     754,104 ns/iter (+/- 121,968)
-
-s/set-value/update-value/
-test unify::test::big_array_bench ... bench:     731,531 ns/iter (+/- 125,685)
-test unify::test::big_array_bench ... bench:     725,162 ns/iter (+/- 99,013)
-test unify::test::big_array_bench ... bench:     735,473 ns/iter (+/- 121,156)

src/lib.rs

@@ -10,6 +10,7 @@
 
 // The CC code uses `impl Trait`
 #![cfg_attr(feature = "congruence-closure", feature(conservative_impl_trait))]
+#![cfg_attr(feature = "bench", feature(test))]
 
 #[macro_use]
 extern crate log;

src/unify/tests.rs

@@ -8,9 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#[cfg(feature = "unstable")]
+#[cfg(feature = "bench")]
 extern crate test;
-#[cfg(feature = "unstable")]
+#[cfg(feature = "bench")]
 use self::test::Bencher;
 use std::collections::HashSet;
 use std::cmp;
@@ -63,7 +63,7 @@ fn big_array() {
     }
 }
 
-#[cfg(feature = "unstable")]
+#[cfg(feature = "bench")]
 #[bench]
 fn big_array_bench(b: &mut Bencher) {
     let mut ut: UnificationTable<UnitKey> = UnificationTable::new();