Relax some float tests.

Author: LorrensP-2158466

library/std/src/num/f32.rs

@@ -479,7 +479,7 @@ impl f32 {
     /// // log5(5) - 1 == 0
     /// let abs_difference = (five.log(5.0) - 1.0).abs();
     ///
-    /// assert!(abs_difference <= 1e-6);
+    /// assert!(abs_difference <= 1e-7);
     /// ```
     ///
     /// Non-positive values:
@@ -1125,7 +1125,7 @@ impl f32 {
     ///
     /// let abs_difference = (f - e).abs();
     ///
-    /// assert!(abs_difference <= 1e-4);
+    /// assert!(abs_difference <= 1e-5);
     /// ```
     #[doc(alias = "arctanh")]
     #[rustc_allow_incoherent_impl]
@@ -1153,7 +1153,7 @@ impl f32 {
     ///
     /// let abs_difference = (x.gamma() - 24.0).abs();
     ///
-    /// assert!(abs_difference <= 1e-4);
+    /// assert!(abs_difference <= 1e-5);
     /// ```
     #[rustc_allow_incoherent_impl]
     #[must_use = "method returns a new number and does not mutate the original value"]

library/std/src/num/f64.rs

@@ -1248,7 +1248,7 @@ impl f64 {
     /// let one = x.erf() + x.erfc();
     /// let abs_difference = (one - 1.0).abs();
     ///
-    /// assert!(abs_difference <= 1e-10);
+    /// assert!(abs_difference <= f64::EPSILON);
     /// ```
     #[rustc_allow_incoherent_impl]
     #[must_use = "method returns a new number and does not mutate the original value"]

library/std/tests/floats/f32.rs

@@ -196,10 +196,10 @@ fn test_gamma() {
     assert_approx_eq!(1.0f32.gamma(), 1.0f32);
     assert_approx_eq!(2.0f32.gamma(), 1.0f32);
     assert_approx_eq!(3.0f32.gamma(), 2.0f32);
-    assert_approx_eq!(4.0f32.gamma(), 6.0f32, APPROX_DELTA);
+    assert_approx_eq!(4.0f32.gamma(), 6.0f32);
     assert_approx_eq!(5.0f32.gamma(), 24.0f32, APPROX_DELTA);
     assert_approx_eq!(0.5f32.gamma(), consts::PI.sqrt());
-    assert_approx_eq!((-0.5f32).gamma(), -2.0 * consts::PI.sqrt(), APPROX_DELTA);
+    assert_approx_eq!((-0.5f32).gamma(), -2.0 * consts::PI.sqrt());
     assert_eq!(0.0f32.gamma(), f32::INFINITY);
     assert_eq!((-0.0f32).gamma(), f32::NEG_INFINITY);
     assert!((-1.0f32).gamma().is_nan());