// We might have a candidate for promotion.
let candidate = Candidate::Ref(location);
if self.can_promote() {
- // We can only promote direct borrows of temps.
+ // We can only promote interior borrows of non-drop temps.
+ let mut place = place;
+ while let Place::Projection(ref proj) = *place {
+ if proj.elem == ProjectionElem::Deref {
+ break;
+ }
+ place = &proj.base;
+ }
if let Place::Local(local) = *place {
if self.mir.local_kind(local) == LocalKind::Temp {
- self.promotion_candidates.push(candidate);
+ if let Some(qualif) = self.temp_qualif[local] {
+ if !qualif.intersects(Qualif::NEEDS_DROP) {
+ self.promotion_candidates.push(candidate);
+ }
+ }
}
}
}
--- /dev/null
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// compile-flags: -Z borrowck=compare
+
+const ALL_THE_NUMS: [u32; 1] = [
+ 1
+];
+
+#[inline(never)]
+fn array(i: usize) -> &'static u32 {
+ return &ALL_THE_NUMS[i];
+}
+
+#[inline(never)]
+fn tuple_field() -> &'static u32 {
+ &(42,).0
+}
+
+fn main() {
+ assert_eq!(tuple_field().to_string(), "42");
+ // assert_eq!(array(0).to_string(), "1");
+}