2 files changed, 2 insertions, 19 deletions
diff --git a/compiler/rustc_const_eval/src/const_eval/fn_queries.rs b/compiler/rustc_const_eval/src/const_eval/fn_queries.rs
index ca0993f0580..037fdcbcf9b 100644
--- a/compiler/rustc_const_eval/src/const_eval/fn_queries.rs
+++ b/compiler/rustc_const_eval/src/const_eval/fn_queries.rs
@@ -1,25 +1,8 @@
+use rustc_hir as hir;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_middle::query::Providers;
 use rustc_middle::ty::TyCtxt;
-use rustc_span::symbol::Symbol;
-use {rustc_attr as attr, rustc_hir as hir};
-
-/// Whether the `def_id` is an unstable const fn and what feature gate(s) are necessary to enable
-/// it.
-pub fn is_unstable_const_fn(tcx: TyCtxt<'_>, def_id: DefId) -> Option<(Symbol, Option<Symbol>)> {
-    if tcx.is_const_fn_raw(def_id) {
-        let const_stab = tcx.lookup_const_stability(def_id)?;
-        match const_stab.level {
-            attr::StabilityLevel::Unstable { implied_by, .. } => {
-                Some((const_stab.feature, implied_by))
-            }
-            attr::StabilityLevel::Stable { .. } => None,
-        }
-    } else {
-        None
-    }
-}
 
 pub fn is_parent_const_impl_raw(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
     let parent_id = tcx.local_parent(def_id);
diff --git a/compiler/rustc_const_eval/src/const_eval/machine.rs b/compiler/rustc_const_eval/src/const_eval/machine.rs
index 2db43a0f787..7793de9c933 100644
--- a/compiler/rustc_const_eval/src/const_eval/machine.rs
+++ b/compiler/rustc_const_eval/src/const_eval/machine.rs
@@ -219,7 +219,7 @@ impl<'tcx> CompileTimeInterpCx<'tcx> {
     }
 
     /// "Intercept" a function call, because we have something special to do for it.
-    /// All `#[rustc_do_not_const_check]` functions should be hooked here.
+    /// All `#[rustc_do_not_const_check]` functions MUST be hooked here.
     /// If this returns `Some` function, which may be `instance` or a different function with
     /// compatible arguments, then evaluation should continue with that function.
     /// If this returns `None`, the function call has been handled and the function has returned.