From 6afbfcaa3ec1053d806af2055ded58b1faff4dee Mon Sep 17 00:00:00 2001
From: Dylan MacKenzie <ecstaticmorse@gmail.com>
Date: Sun, 5 Dec 2021 13:11:55 -0800
Subject: [PATCH] Remove unnecessary FIXME (answered by Oli)

---
 compiler/rustc_mir_transform/src/lib.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/compiler/rustc_mir_transform/src/lib.rs b/compiler/rustc_mir_transform/src/lib.rs
index a7e003a55b4..130688e2d53 100644
--- a/compiler/rustc_mir_transform/src/lib.rs
+++ b/compiler/rustc_mir_transform/src/lib.rs
@@ -480,8 +480,7 @@ fn o1<T>(x: T) -> WithMinOptLevel<T> {
             // FIXME(#70073): This pass is responsible for both optimization as well as some lints.
             &const_prop::ConstProp,
             //
-            // FIXME: The old pass manager ran this only at mir-opt-level >= 1, but
-            // const-prop runs unconditionally. Should this run unconditionally as well?
+            // Const-prop runs unconditionally, but doesn't mutate the MIR at mir-opt-level=0.
             &o1(simplify_branches::SimplifyConstCondition::new("after-const-prop")),
             &early_otherwise_branch::EarlyOtherwiseBranch,
             &simplify_comparison_integral::SimplifyComparisonIntegral,