Allow mutable borrows in constant bodies

2019-11-21 14:33:39 -05:00 · 2019-11-21 14:33:39 -05:00 · 1f420b9891
commit 1f420b9891
parent d24ae2577f
1 changed files with 4 additions and 0 deletions
--- a/src/librustc_mir/transform/check_consts/ops.rs
+++ b/src/librustc_mir/transform/check_consts/ops.rs
@ -183,6 +183,10 @@ fn emit_error(&self, item: &Item<'_, '_>, span: Span) {
 #[derive(Debug)]
 pub struct MutBorrow(pub BorrowKind);
 impl NonConstOp for MutBorrow {
+    fn feature_gate(tcx: TyCtxt<'_>) -> Option<bool> {
+        Some(tcx.features().const_mut_refs)
+    }
+
    fn emit_error(&self, item: &Item<'_, '_>, span: Span) {
        let kind = self.0;
        if let BorrowKind::Mut { .. } = kind {