Remove duplicate try_opt macro

src/duration.rs

@@ -16,6 +16,8 @@ use core::{fmt, i64};
 #[cfg(feature = "std")]
 use std::error::Error;
 
+use crate::try_opt;
+
 #[cfg(feature = "rkyv")]
 use rkyv::{Archive, Deserialize, Serialize};
 
@@ -38,15 +40,6 @@ const SECS_PER_DAY: i64 = 86_400;
 /// The number of (non-leap) seconds in a week.
 const SECS_PER_WEEK: i64 = 604_800;
 
-macro_rules! try_opt {
- ($e:expr) => {
- match $e {
- Some(v) => v,
- None => return None,
- }
- };
-}
-
 /// ISO 8601 time duration with nanosecond precision.
 ///
 /// This also allows for the negative duration; see individual methods for details.