update intern classification comment
diff --git a/src/librustc_mir/interpret/intern.rs b/src/librustc_mir/interpret/intern.rs
index 0031dbc4..95647ce 100644
--- a/src/librustc_mir/interpret/intern.rs
+++ b/src/librustc_mir/interpret/intern.rs
@@ -278,9 +278,10 @@
// this `mutability` is the mutability of the place, ignoring the type
let (base_mutability, base_intern_mode) = match tcx.static_mutability(def_id) {
Some(hir::Mutability::MutImmutable) => (Mutability::Immutable, InternMode::Static),
- None => (Mutability::Immutable, InternMode::ConstBase),
// `static mut` doesn't care about interior mutability, it's mutable anyway
Some(hir::Mutability::MutMutable) => (Mutability::Mutable, InternMode::Static),
+ // consts, promoteds. FIXME: what about array lengths, array initializers?
+ None => (Mutability::Immutable, InternMode::ConstBase),
};
// Type based interning.
