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/// The same implementation.
///
/// ```compile_fail,E0119
/// use pin_project::unsafe_project;
/// use std::marker::Unpin;
/// use std::pin::Pin;
///
/// #[unsafe_project(Unpin)]
/// struct Foo<T, U> {
/// #[pin]
/// future: T,
/// field: U,
/// }
///
/// impl<T, U> Foo<T, U> {
/// fn baz(mut self: Pin<&mut Self>) {
/// let this = self.project();
/// let _: Pin<&mut T> = this.future; // Pinned reference to the field
/// let _: &mut U = this.field; // Normal reference to the field
/// }
/// }
///
/// // conflicting implementations
/// impl<T, U> Unpin for Foo<T, U> where T: Unpin {} // Conditional Unpin impl
/// ```
///
/// The implementation that under different conditions.
///
/// ```compile_fail,E0119
/// use pin_project::unsafe_project;
/// use std::marker::Unpin;
/// use std::pin::Pin;
///
/// #[unsafe_project(Unpin)]
/// struct Foo<T, U> {
/// #[pin]
/// future: T,
/// field: U,
/// }
///
/// impl<T, U> Foo<T, U> {
/// fn baz(mut self: Pin<&mut Self>) {
/// let this = self.project();
/// let _: Pin<&mut T> = this.future; // Pinned reference to the field
/// let _: &mut U = this.field; // Normal reference to the field
/// }
/// }
///
/// // conflicting implementations
/// impl<T, U> Unpin for Foo<T, U> {} // Non-conditional Unpin impl
/// ```
///
/// ```compile_fail,E0119
/// use pin_project::unsafe_project;
/// use std::marker::Unpin;
/// use std::pin::Pin;
///
/// #[unsafe_project(Unpin)]
/// struct Foo<T, U> {
/// #[pin]
/// future: T,
/// field: U,
/// }
///
/// impl<T, U> Foo<T, U> {
/// fn baz(mut self: Pin<&mut Self>) {
/// let this = self.project();
/// let _: Pin<&mut T> = this.future; // Pinned reference to the field
/// let _: &mut U = this.field; // Normal reference to the field
/// }
/// }
///
/// // conflicting implementations
/// impl<T: Unpin, U: Unpin> Unpin for Foo<T, U> {} // Conditional Unpin impl
/// ```
/// The same implementation.
///
/// ```compile_fail,E0119
/// use pin_project::unsafe_fields;
/// use std::marker::Unpin;
/// use std::pin::Pin;
///
/// #[unsafe_fields(Unpin)]
/// struct Foo<T, U> {
/// #[pin]
/// future: T,
/// field: U,
/// }
///
/// impl<T, U> Foo<T, U> {
/// fn baz(mut self: Pin<&mut Self>) {
/// let _: Pin<&mut T> = self.as_mut().future(); // Pinned reference to the field
/// let _: &mut U = self.as_mut().field(); // Normal reference to the field
/// }
/// }
///
/// // conflicting implementations
/// impl<T, U> Unpin for Foo<T, U> where T: Unpin {} // Conditional Unpin impl
/// ```
///
/// The implementation that under different conditions.
///
/// ```compile_fail,E0119
/// use pin_project::unsafe_fields;
/// use std::marker::Unpin;
/// use std::pin::Pin;
///
/// #[unsafe_fields(Unpin)]
/// struct Foo<T, U> {
/// #[pin]
/// future: T,
/// field: U,
/// }
///
/// impl<T, U> Foo<T, U> {
/// fn baz(mut self: Pin<&mut Self>) {
/// let _: Pin<&mut T> = self.as_mut().future(); // Pinned reference to the field
/// let _: &mut U = self.as_mut().field(); // Normal reference to the field
/// }
/// }
///
/// // conflicting implementations
/// impl<T, U> Unpin for Foo<T, U> {} // Non-conditional Unpin impl
/// ```
///
/// ```compile_fail,E0119
/// use pin_project::unsafe_fields;
/// use std::marker::Unpin;
/// use std::pin::Pin;
///
/// #[unsafe_fields(Unpin)]
/// struct Foo<T, U> {
/// #[pin]
/// future: T,
/// field: U,
/// }
///
/// impl<T, U> Foo<T, U> {
/// fn baz(mut self: Pin<&mut Self>) {
/// let _: Pin<&mut T> = self.as_mut().future(); // Pinned reference to the field
/// let _: &mut U = self.as_mut().field(); // Normal reference to the field
/// }
/// }
///
/// // conflicting implementations
/// impl<T: Unpin, U: Unpin> Unpin for Foo<T, U> {} // Conditional Unpin impl
/// ```