Check the existence of is_subnormal (1.53) before forwarding

Author: cuviper

.github/workflows/ci.yaml

@@ -19,6 +19,7 @@ jobs:
           1.38.0, # has_div_euclid
           1.44.0, # has_to_int_unchecked
           1.46.0, # has_leading_trailing_ones
+          1.53.0, # has_is_subnormal
           stable,
           beta,
           nightly,

bors.toml

@@ -5,6 +5,7 @@ status = [
   "Test (1.38.0)",
   "Test (1.44.0)",
   "Test (1.46.0)",
+  "Test (1.53.0)",
   "Test (stable)",
   "Test (beta)",
   "Test (nightly)",

build.rs

@@ -15,6 +15,7 @@ fn main() {
     if env::var_os("CARGO_FEATURE_STD").is_some() {
         ac.emit_expression_cfg("1f64.copysign(-1f64)", "has_copysign");
     }
+    ac.emit_expression_cfg("1f64.is_subnormal()", "has_is_subnormal");
 
     autocfg::rerun_path("build.rs");
 }

ci/rustup.sh

@@ -5,6 +5,6 @@
 set -ex
 
 ci=$(dirname $0)
-for version in 1.31.0 1.35.0 1.37.0 1.38.0 1.44.0 1.46.0 stable beta nightly; do
+for version in 1.31.0 1.35.0 1.37.0 1.38.0 1.44.0 1.46.0 1.53.0 stable beta nightly; do
     rustup run "$version" "$ci/test_full.sh"
 done

src/float.rs

@@ -923,7 +923,6 @@ impl FloatCore for f64 {
         Self::is_infinite(self) -> bool;
         Self::is_finite(self) -> bool;
         Self::is_normal(self) -> bool;
-        Self::is_subnormal(self) -> bool;
         Self::classify(self) -> FpCategory;
         Self::floor(self) -> Self;
         Self::ceil(self) -> Self;
@@ -942,6 +941,11 @@ impl FloatCore for f64 {
         Self::to_radians(self) -> Self;
     }
 
+    #[cfg(has_is_subnormal)]
+    forward! {
+        Self::is_subnormal(self) -> bool;
+    }
+
     #[cfg(all(not(feature = "std"), feature = "libm"))]
     forward! {
         libm::floor as floor(self) -> Self;
@@ -1960,7 +1964,6 @@ macro_rules! float_impl_std {
                 Self::is_infinite(self) -> bool;
                 Self::is_finite(self) -> bool;
                 Self::is_normal(self) -> bool;
-                Self::is_subnormal(self) -> bool;
                 Self::classify(self) -> FpCategory;
                 Self::floor(self) -> Self;
                 Self::ceil(self) -> Self;
@@ -2007,9 +2010,13 @@ macro_rules! float_impl_std {
             }
 
             #[cfg(has_copysign)]
-            #[inline]
-            fn copysign(self, sign: Self) -> Self {
-                Self::copysign(self, sign)
+            forward! {
+                Self::copysign(self, sign: Self) -> Self;
+            }
+
+            #[cfg(has_is_subnormal)]
+            forward! {
+                Self::is_subnormal(self) -> bool;
             }
         }
     };