From 3e01b0a8fd9325928a1df10ee1c5210dacc5a859 Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume.gomez@huawei.com>
Date: Tue, 1 Feb 2022 12:29:22 +0100
Subject: [PATCH] Fix lifetime elision in type aliases

---
 src/librustdoc/clean/mod.rs | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index 33612c80654..6a654eebaa2 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -1426,15 +1426,25 @@ fn normalize<'tcx>(cx: &mut DocContext<'tcx>, ty: Ty<'_>) -> Option<Ty<'tcx>> {
         return None;
     }
 
+    use crate::rustc_trait_selection::infer::TyCtxtInferExt;
+    use crate::rustc_trait_selection::traits::query::normalize::AtExt;
+    use rustc_middle::traits::ObligationCause;
+
     // Try to normalize `<X as Y>::T` to a type
     let lifted = ty.lift_to_tcx(cx.tcx).unwrap();
-    match cx.tcx.try_normalize_erasing_regions(cx.param_env, lifted) {
+    let normalized = cx.tcx.infer_ctxt().enter(|infcx| {
+        infcx
+            .at(&ObligationCause::dummy(), cx.param_env)
+            .normalize(lifted)
+            .map(|resolved| infcx.resolve_vars_if_possible(resolved.value))
+    });
+    match normalized {
         Ok(normalized_value) => {
-            trace!("normalized {:?} to {:?}", ty, normalized_value);
+            debug!("normalized {:?} to {:?}", ty, normalized_value);
             Some(normalized_value)
         }
         Err(err) => {
-            info!("failed to normalize {:?}: {:?}", ty, err);
+            debug!("failed to normalize {:?}: {:?}", ty, err);
             None
         }
     }