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#![unstable(feature = "collections_range",
reason = "waiting for dust to settle on inclusive ranges",
issue = "30877")]
use core::option::Option::{self, None, Some};
use core::ops::{RangeFull, Range, RangeTo, RangeFrom};
pub trait RangeArgument<T> {
fn start(&self) -> Option<&T> {
None
}
fn end(&self) -> Option<&T> {
None
}
}
impl<T> RangeArgument<T> for RangeFull {}
impl<T> RangeArgument<T> for RangeFrom<T> {
fn start(&self) -> Option<&T> {
Some(&self.start)
}
}
impl<T> RangeArgument<T> for RangeTo<T> {
fn end(&self) -> Option<&T> {
Some(&self.end)
}
}
impl<T> RangeArgument<T> for Range<T> {
fn start(&self) -> Option<&T> {
Some(&self.start)
}
fn end(&self) -> Option<&T> {
Some(&self.end)
}
}