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.

2 files changed, 4 insertions, 5 deletions

diff --git a/src/libcollections/bit.rs b/src/libcollections/bit.rs
index d12b979e084..bb90363bc1d 100644
--- a/src/libcollections/bit.rs
+++ b/src/libcollections/bit.rs
@@ -40,7 +40,6 @@
 //! ```
 //! # #![feature(collections, core, step_by)]
 //! use std::collections::{BitSet, BitVec};
-//! use std::num::Float;
 //! use std::iter;
 //!
 //! let max_prime = 10000;
diff --git a/src/libcollections/fmt.rs b/src/libcollections/fmt.rs
index 80942754c7b..d8a0e4daf43 100644
--- a/src/libcollections/fmt.rs
+++ b/src/libcollections/fmt.rs
@@ -175,7 +175,6 @@
 //! # #![feature(core, std_misc)]
 //! use std::fmt;
 //! use std::f64;
-//! use std::num::Float;
 //!
 //! #[derive(Debug)]
 //! struct Vector2D {
@@ -200,10 +199,11 @@
 //!         let magnitude = magnitude.sqrt();
 //!
 //!         // Respect the formatting flags by using the helper method
-//!         // `pad_integral` on the Formatter object. See the method documentation
-//!         // for details, and the function `pad` can be used to pad strings.
+//!         // `pad_integral` on the Formatter object. See the method
+//!         // documentation for details, and the function `pad` can be used
+//!         // to pad strings.
 //!         let decimals = f.precision().unwrap_or(3);
-//!         let string = f64::to_str_exact(magnitude, decimals);
+//!         let string = format!("{:.*}", decimals, magnitude);
 //!         f.pad_integral(true, "", &string)
 //!     }
 //! }