std: Bring back f32::from_str_radix as an unstable API

This API was exercised in a few tests and mirrors the `from_str_radix`
functionality of the integer types.

Conflicts:
	src/doc/trpl/traits.md
	src/libstd/sys/windows/fs2.rs

1 files changed, 1 insertions, 2 deletions

diff --git a/src/libtest/stats.rs b/src/libtest/stats.rs
index 341be762601..c1ba1260f67 100644
--- a/src/libtest/stats.rs
+++ b/src/libtest/stats.rs
@@ -338,14 +338,13 @@ mod tests {
 
     macro_rules! assert_approx_eq {
         ($a:expr, $b:expr) => ({
-            use std::num::Float;
             let (a, b) = (&$a, &$b);
             assert!((*a - *b).abs() < 1.0e-6,
                     "{} is not approximately equal to {}", *a, *b);
         })
     }
 
-    fn check(samples: &[f64], summ: &Summary<f64>) {
+    fn check(samples: &[f64], summ: &Summary) {
 
         let summ2 = Summary::new(samples);