remove opt function and replace it with method

1 files changed, 4 insertions, 8 deletions

diff --git a/src/lib.rs b/src/lib.rs
index ad5a479..63dd7eb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -184,6 +184,10 @@ pub trait Parser<I: Input>: Sized {
     fn ignore(self) -> impl Parser<I, Output = ()> {
         Ignore { parser: self }
     }
+
+    fn opt(self) -> impl Parser<I, Output = Option<Self::Output>> {
+        Opt { parser: self }
+    }
 }
 
 impl<I, O, F> Parser<I> for F
@@ -686,14 +690,6 @@ where
     }
 }
 
-pub fn opt<I, P>(parser: P) -> impl Parser<I, Output = Option<P::Output>>
-where
-    I: Input,
-    P: Parser<I>,
-{
-    Opt { parser }
-}
-
 struct VerifyInput<P, C> {
     parser: P,
     checker: C,