Clarify the variance of LtPhPtr

1 files changed, 2 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 012846d..9371275 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -297,6 +297,8 @@ pub unsafe trait Plugin<'ph> {
 pub struct LtPhPtr<'ph> {
     ph: *mut RawPh,
     // 'ph has to be invariant because RawPh is self-referential.
+    // "ideally" we'd want `&'ph mut RawPh<'ph>`, tho the `*mut` above would've
+    // had the same effect if `RawPh` were `RawPh<'ph>`.
     _lt: PhantomData<fn(&'ph ()) -> &'ph ()>,
 }