Remove 'static bounds on P.

These date back to 2014. I don't think they're needed any more.

Author: nnethercote

compiler/rustc_ast/src/ptr.rs

@@ -32,11 +32,11 @@ pub struct P<T: ?Sized> {
 
 /// Construct a `P<T>` from a `T` value.
 #[allow(non_snake_case)]
-pub fn P<T: 'static>(value: T) -> P<T> {
+pub fn P<T>(value: T) -> P<T> {
     P { ptr: Box::new(value) }
 }
 
-impl<T: 'static> P<T> {
+impl<T> P<T> {
     /// Move out of the pointer.
     /// Intended for chaining transformations not covered by `map`.
     pub fn and_then<U, F>(self, f: F) -> U
@@ -86,7 +86,7 @@ impl<T: ?Sized> DerefMut for P<T> {
     }
 }
 
-impl<T: 'static + Clone> Clone for P<T> {
+impl<T: Clone> Clone for P<T> {
     fn clone(&self) -> P<T> {
         P((**self).clone())
     }
@@ -110,7 +110,7 @@ impl<T> fmt::Pointer for P<T> {
     }
 }
 
-impl<D: Decoder, T: 'static + Decodable<D>> Decodable<D> for P<T> {
+impl<D: Decoder, T: Decodable<D>> Decodable<D> for P<T> {
     fn decode(d: &mut D) -> P<T> {
         P(Decodable::decode(d))
     }