From d0cba3df97f43d5e8cf53110cc6800cebdfc4499 Mon Sep 17 00:00:00 2001
From: Camille GILLOT <gillot.camille@gmail.com>
Date: Thu, 3 Aug 2023 12:08:50 +0000
Subject: [PATCH] Do not fetch type to check generator.

---
 compiler/rustc_mir_transform/src/const_prop.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/rustc_mir_transform/src/const_prop.rs b/compiler/rustc_mir_transform/src/const_prop.rs
index c562aa1d3c29d..0c44bccbb4f43 100644
--- a/compiler/rustc_mir_transform/src/const_prop.rs
+++ b/compiler/rustc_mir_transform/src/const_prop.rs
@@ -84,9 +84,9 @@ impl<'tcx> MirPass<'tcx> for ConstProp {
             return;
         }
 
-        let is_generator = tcx.type_of(def_id.to_def_id()).instantiate_identity().is_generator();
         // FIXME(welseywiser) const prop doesn't work on generators because of query cycles
         // computing their layout.
+        let is_generator = def_kind == DefKind::Generator;
         if is_generator {
             trace!("ConstProp skipped for generator {:?}", def_id);
             return;