Fix f16 tolerance.

Author: calder

library/std/tests/floats/f16.rs

@@ -961,9 +961,9 @@ fn test_algebraic() {
     let a: f16 = 123.0;
     let b: f16 = 456.0;
 
-    assert_approx_eq!(a.algebraic_add(b), a + b);
-    assert_approx_eq!(a.algebraic_sub(b), a - b);
-    assert_approx_eq!(a.algebraic_mul(b), a * b);
-    assert_approx_eq!(a.algebraic_div(b), a / b);
-    assert_approx_eq!(a.algebraic_rem(b), a % b);
+    assert_approx_eq!(a.algebraic_add(b), a + b, TOL_0);
+    assert_approx_eq!(a.algebraic_sub(b), a - b, TOL_0);
+    assert_approx_eq!(a.algebraic_mul(b), a * b, TOL_0);
+    assert_approx_eq!(a.algebraic_div(b), a / b, TOL_0);
+    assert_approx_eq!(a.algebraic_rem(b), a % b, TOL_0);
 }