1 files changed, 53 insertions, 0 deletions
diff --git a/src/v1_47.rs b/src/v1_47.rs
new file mode 100644
index 0000000..d628abd
--- /dev/null
+++ b/src/v1_47.rs
@@ -0,0 +1,53 @@
+use crate::traits::Sealed;
+use core::ops::{DerefMut, Range};
+
+pub trait Range_v1_47<Idx>: Sealed<Range<Idx>> {
+    fn is_empty(&self) -> bool;
+}
+
+impl<Idx: PartialOrd<Idx>> Range_v1_47<Idx> for Range<Idx> {
+    fn is_empty(&self) -> bool {
+        !(self.start < self.end)
+    }
+}
+
+pub trait Result_v1_47<T: DerefMut, E>: Sealed<Result<T, E>> {
+    fn as_deref(&self) -> Result<&T::Target, &E>;
+    fn as_deref_mut(&mut self) -> Result<&mut T::Target, &mut E>;
+}
+
+impl<T: DerefMut, E> Result_v1_47<T, E> for Result<T, E> {
+    fn as_deref(&self) -> Result<&T::Target, &E> {
+        self.as_ref().map(|t| t.deref())
+    }
+
+    fn as_deref_mut(&mut self) -> Result<&mut T::Target, &mut E> {
+        self.as_mut().map(|t| t.deref_mut())
+    }
+}
+
+#[cfg(feature = "std")]
+pub trait Vec_v1_47<T>: Sealed<Vec<T>> {
+    fn leak<'a>(self) -> &'a mut [T]
+    where
+        T: 'a;
+}
+
+#[cfg(feature = "std")]
+impl<T> Vec_v1_47<T> for Vec<T> {
+    #[inline]
+    fn leak<'a>(self) -> &'a mut [T]
+    where
+        T: 'a,
+    {
+        Box::leak(self.into_boxed_slice())
+    }
+}
+
+pub mod f32 {
+    pub const TAU: f32 = 6.28318530717958647692528676655900577_f32;
+}
+
+pub mod f64 {
+    pub const TAU: f64 = 6.28318530717958647692528676655900577_f64;
+}