fix generics

Author: taiki-e

src/lib.rs

@@ -906,7 +906,8 @@ macro_rules! __pin_project_internal {
         [$_ident:ident]
         [$($_impl_generics:tt)*] [$($_ty_generics:tt)*] [$(where $($_where_clause:tt)* )?]
         impl $(<
-            $( $generics:tt
+            $( $lifetime:lifetime $(: $lifetime_bound:lifetime)? ),* $(,)?
+            $( $generics:ident
                 $(: $generics_bound:path)?
                 $(: ?$generics_unsized_bound:path)?
                 $(: $generics_lifetime_bound:lifetime)?
@@ -926,6 +927,7 @@ macro_rules! __pin_project_internal {
         }
     ) => {
         impl $(<
+            $( $lifetime $(: $lifetime_bound)? ,)*
             $( $generics
                 $(: $generics_bound)?
                 $(: ?$generics_unsized_bound)?
@@ -955,6 +957,7 @@ macro_rules! __pin_project_internal {
                     fn __drop_inner(self: $crate::__private::Pin<&mut Self>);
                 }
                 impl $(<
+                    $( $lifetime $(: $lifetime_bound)? ,)*
                     $( $generics
                         $(: $generics_bound)?
                         $(: ?$generics_unsized_bound)?