Add must_use attributes

Author: tuguzT

src/provide/owned.rs

@@ -103,6 +103,7 @@ pub trait Provide<T>: Sized {
     /// let (Wrapper(dependency), _): (Wrapper<_>, _) = provider.provide();
     /// assert_eq!(dependency, MyDependency { foo: 1, bar: 2.0 });
     /// ```
+    #[must_use = "this call returns dependency and remaining part of the provider"]
     fn provide(self) -> (T, Self::Remainder);
 }
 

src/with/provide/owned.rs

@@ -25,6 +25,7 @@ pub trait ProvideWith<T, C>: Sized {
     ///
     /// todo!()
     /// ```
+    #[must_use = "this call returns dependency and remaining part of the provider"]
     fn provide_with(self, context: C) -> (T, Self::Remainder);
 }
 

src/with/with.rs

@@ -19,6 +19,7 @@ pub trait With<T>: Sized {
     ///
     /// todo!()
     /// ```
+    #[must_use]
     fn with(self, dependency: T) -> Self::Output;
 }