Use `std::convert::identity`

src/option/from_stream.rs

@@ -2,7 +2,7 @@ use std::pin::Pin;
 
 use crate::prelude::*;
 use crate::stream::{FromStream, IntoStream};
-use crate::utils::identity;
+use std::convert::identity;
 
 impl<T, V> FromStream<Option<T>> for Option<V>
 where
@@ -33,11 +33,7 @@ where
                 .collect()
                 .await;
 
-            if found_none {
+            if found_none { None } else { Some(out) }
-                None
-            } else {
-                Some(out)
-            }
         })
     }
 }

src/option/product.rs

@@ -2,7 +2,7 @@ use std::pin::Pin;
 
 use crate::prelude::*;
 use crate::stream::{Product, Stream};
-use crate::utils::identity;
+use std::convert::identity;
 
 impl<T, U> Product<Option<U>> for Option<T>
 where
@@ -57,11 +57,7 @@ where
             )
             .await;
 
-            if found_none {
+            if found_none { None } else { Some(out) }
-                None
-            } else {
-                Some(out)
-            }
         })
     }
 }

src/option/sum.rs

@@ -2,7 +2,7 @@ use std::pin::Pin;
 
 use crate::prelude::*;
 use crate::stream::{Stream, Sum};
-use crate::utils::identity;
+use std::convert::identity;
 
 impl<T, U> Sum<Option<U>> for Option<T>
 where
@@ -52,11 +52,7 @@ where
             )
             .await;
 
-            if found_none {
+            if found_none { None } else { Some(out) }
-                None
-            } else {
-                Some(out)
-            }
         })
     }
 }

src/utils.rs

@@ -52,14 +52,6 @@ pub fn random(n: u32) -> u32 {
     })
 }
 
-/// Returns given argument without changes.
-#[allow(dead_code)]
-#[doc(hidden)]
-#[inline(always)]
-pub(crate) fn identity<T>(arg: T) -> T {
-    arg
-}
-
 /// Add additional context to errors
 pub(crate) trait Context {
     fn context(self, message: impl Fn() -> String) -> Self;