auto merge of #18999 : aturon/rust/stab-floats, r=alexcrichton,alexcrichton

This commit adds stability markers for the APIs that have recently been aligned with [numerics reform](rust-lang/rfcs#369). For APIs that were changed as part of that reform, `#[unstable]` is used to reflect the recency, but the APIs will become `#[stable]` in a follow-up pass.

In addition, a few aspects of the APIs not explicitly covered by the RFC are marked here -- in particular, constants for floats.

This commit does not mark the `uint` or `int` modules as `#[stable]`, given the ongoing debate out the names and roles of these types.

Due to some deprecation (see the RFC for details), this is a:

[breaking-change]

r? @alexcrichton 
cc @bjz

Author: bors

src/libcore/num/f32.rs

@@ -14,44 +14,57 @@
 // FIXME: MIN_VALUE and MAX_VALUE literals are parsed as -inf and inf #14353
 #![allow(overflowing_literals)]
 
+#![stable]
+
 use intrinsics;
 use mem;
 use num::{Float, FPNormal, FPCategory, FPZero, FPSubnormal, FPInfinite, FPNaN};
 use num::from_str_radix;
 use option::Option;
 
+#[stable]
 pub const RADIX: uint = 2u;
 
+#[stable]
 pub const MANTISSA_DIGITS: uint = 24u;
+#[stable]
 pub const DIGITS: uint = 6u;
 
+#[stable]
 pub const EPSILON: f32 = 1.19209290e-07_f32;
 
 /// Smallest finite f32 value
+#[stable]
 pub const MIN_VALUE: f32 = -3.40282347e+38_f32;
 /// Smallest positive, normalized f32 value
+#[stable]
 pub const MIN_POS_VALUE: f32 = 1.17549435e-38_f32;
 /// Largest finite f32 value
+#[stable]
 pub const MAX_VALUE: f32 = 3.40282347e+38_f32;
 
+#[stable]
 pub const MIN_EXP: int = -125;
+#[stable]
 pub const MAX_EXP: int = 128;
 
+#[stable]
 pub const MIN_10_EXP: int = -37;
+#[stable]
 pub const MAX_10_EXP: int = 38;
 
+#[stable]
 pub const NAN: f32 = 0.0_f32/0.0_f32;
+#[stable]
 pub const INFINITY: f32 = 1.0_f32/0.0_f32;
+#[stable]
 pub const NEG_INFINITY: f32 = -1.0_f32/0.0_f32;
 
 /// Various useful constants.
+#[unstable = "naming scheme needs to be revisited"]
 pub mod consts {
     // FIXME: replace with mathematical constants from cmath.
 
-    // FIXME(#5527): These constants should be deprecated once associated
-    // constants are implemented in favour of referencing the respective members
-    // of `Float`.
-
     /// Archimedes' constant
     pub const PI: f32 = 3.14159265358979323846264338327950288_f32;
 
@@ -104,6 +117,7 @@ pub mod consts {
     pub const LN_10: f32 = 2.30258509299404568401799145468436421_f32;
 }
 
+#[unstable = "trait is unstable"]
 impl Float for f32 {
     #[inline]
     fn nan() -> f32 { NAN }
@@ -415,12 +429,12 @@ impl Float for f32 {
 
     /// Converts to degrees, assuming the number is in radians.
     #[inline]
-    fn to_degrees(self) -> f32 { self * (180.0f32 / Float::pi()) }
+    fn to_degrees(self) -> f32 { self * (180.0f32 / consts::PI) }
 
     /// Converts to radians, assuming the number is in degrees.
     #[inline]
     fn to_radians(self) -> f32 {
-        let value: f32 = Float::pi();
+        let value: f32 = consts::PI;
         self * (value / 180.0f32)
     }
 }

src/libcore/num/f64.rs

@@ -14,6 +14,8 @@
 // FIXME: MIN_VALUE and MAX_VALUE literals are parsed as -inf and inf #14353
 #![allow(overflowing_literals)]
 
+#![stable]
+
 use intrinsics;
 use mem;
 use num::{Float, FPNormal, FPCategory, FPZero, FPSubnormal, FPInfinite, FPNaN};
@@ -24,33 +26,46 @@ use option::Option;
 // constants are implemented in favour of referencing the respective
 // members of `Bounded` and `Float`.
 
+#[stable]
 pub const RADIX: uint = 2u;
 
+#[stable]
 pub const MANTISSA_DIGITS: uint = 53u;
+#[stable]
 pub const DIGITS: uint = 15u;
 
+#[stable]
 pub const EPSILON: f64 = 2.2204460492503131e-16_f64;
 
 /// Smallest finite f64 value
+#[stable]
 pub const MIN_VALUE: f64 = -1.7976931348623157e+308_f64;
 /// Smallest positive, normalized f64 value
+#[stable]
 pub const MIN_POS_VALUE: f64 = 2.2250738585072014e-308_f64;
 /// Largest finite f64 value
+#[stable]
 pub const MAX_VALUE: f64 = 1.7976931348623157e+308_f64;
 
+#[stable]
 pub const MIN_EXP: int = -1021;
+#[stable]
 pub const MAX_EXP: int = 1024;
 
+#[stable]
 pub const MIN_10_EXP: int = -307;
+#[stable]
 pub const MAX_10_EXP: int = 308;
 
+#[stable]
 pub const NAN: f64 = 0.0_f64/0.0_f64;
-
+#[stable]
 pub const INFINITY: f64 = 1.0_f64/0.0_f64;
-
+#[stable]
 pub const NEG_INFINITY: f64 = -1.0_f64/0.0_f64;
 
 /// Various useful constants.
+#[unstable = "naming scheme needs to be revisited"]
 pub mod consts {
     // FIXME: replace with mathematical constants from cmath.
 
@@ -110,6 +125,7 @@ pub mod consts {
     pub const LN_10: f64 = 2.30258509299404568401799145468436421_f64;
 }
 
+#[unstable = "trait is unstable"]
 impl Float for f64 {
     #[inline]
     fn nan() -> f64 { NAN }
@@ -421,12 +437,12 @@ impl Float for f64 {
 
     /// Converts to degrees, assuming the number is in radians.
     #[inline]
-    fn to_degrees(self) -> f64 { self * (180.0f64 / Float::pi()) }
+    fn to_degrees(self) -> f64 { self * (180.0f64 / consts::PI) }
 
     /// Converts to radians, assuming the number is in degrees.
     #[inline]
     fn to_radians(self) -> f64 {
-        let value: f64 = Float::pi();
+        let value: f64 = consts::PI;
         self * (value / 180.0)
     }
 }

src/libcore/num/i16.rs

@@ -10,8 +10,7 @@
 
 //! Operations and constants for signed 16-bits integers (`i16` type)
 
-#![unstable]
+#![stable]
 #![doc(primitive = "i16")]
 
 int_module!(i16, 16)
-

src/libcore/num/i32.rs

@@ -10,8 +10,7 @@
 
 //! Operations and constants for signed 32-bits integers (`i32` type)
 
-#![unstable]
+#![stable]
 #![doc(primitive = "i32")]
 
 int_module!(i32, 32)
-

src/libcore/num/i64.rs

@@ -10,8 +10,7 @@
 
 //! Operations and constants for signed 64-bits integers (`i64` type)
 
-#![unstable]
+#![stable]
 #![doc(primitive = "i64")]
 
 int_module!(i64, 64)
-

src/libcore/num/i8.rs

@@ -10,8 +10,7 @@
 
 //! Operations and constants for signed 8-bits integers (`i8` type)
 
-#![unstable]
+#![stable]
 #![doc(primitive = "i8")]
 
 int_module!(i8, 8)
-