Rollup merge of #95179 - b-naber:eval-in-try-unify, r=lcnr

Try to evaluate in try unify and postpone resolution of constants that contain inference variables

We want code like that in [`ui/const-generics/generic_const_exprs/eval-try-unify.rs`](https://github.com/rust-lang/rust/compare/master...b-naber:eval-in-try-unify?expand=1#diff-8027038201cf07a6c96abf3cbf0b0f4fdd8a64ce6292435f01c8ed995b87fe9b) to compile. To do that we need to try to evaluate constants in `try_unify_abstract_consts`, this requires us to be more careful about what constants we try to resolve, specifically we cannot try to resolve constants that still contain inference variables.

r? `@lcnr`

1 files changed, 4 insertions, 4 deletions

diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index 87af90d059b..cd6ff8254ad 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -331,12 +331,12 @@ rustc_queries! {
         }
     }
 
-    query try_unify_abstract_consts(key: (
-        ty::Unevaluated<'tcx, ()>, ty::Unevaluated<'tcx, ()>
-    )) -> bool {
+    query try_unify_abstract_consts(key:
+        ty::ParamEnvAnd<'tcx, (ty::Unevaluated<'tcx, ()>, ty::Unevaluated<'tcx, ()>
+    )>) -> bool {
         desc {
             |tcx| "trying to unify the generic constants {} and {}",
-            tcx.def_path_str(key.0.def.did), tcx.def_path_str(key.1.def.did)
+            tcx.def_path_str(key.value.0.def.did), tcx.def_path_str(key.value.1.def.did)
         }
     }