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-rw-r--r--src/test/ui-fulldeps/dropck-tarena-cycle-checked.rs117
1 files changed, 117 insertions, 0 deletions
diff --git a/src/test/ui-fulldeps/dropck-tarena-cycle-checked.rs b/src/test/ui-fulldeps/dropck-tarena-cycle-checked.rs
new file mode 100644
index 000000000..cc97971a0
--- /dev/null
+++ b/src/test/ui-fulldeps/dropck-tarena-cycle-checked.rs
@@ -0,0 +1,117 @@
+// Reject mixing cyclic structure and Drop when using TypedArena.
+//
+// (Compare against dropck-vec-cycle-checked.rs)
+//
+// (Also compare against ui-fulldeps/dropck-tarena-unsound-drop.rs,
+// which is a reduction of this code to more directly show the reason
+// for the error message we see here.)
+
+#![feature(rustc_private)]
+
+extern crate rustc_arena;
+
+use rustc_arena::TypedArena;
+use std::cell::Cell;
+use id::Id;
+
+mod s {
+ use std::sync::atomic::{AtomicUsize, Ordering};
+
+ static S_COUNT: AtomicUsize = AtomicUsize::new(0);
+
+ pub fn next_count() -> usize {
+ S_COUNT.fetch_add(1, Ordering::SeqCst) + 1
+ }
+}
+
+mod id {
+ use s;
+ #[derive(Debug)]
+ pub struct Id {
+ orig_count: usize,
+ count: usize,
+ }
+
+ impl Id {
+ pub fn new() -> Id {
+ let c = s::next_count();
+ println!("building Id {}", c);
+ Id { orig_count: c, count: c }
+ }
+ pub fn count(&self) -> usize {
+ println!("Id::count on {} returns {}", self.orig_count, self.count);
+ self.count
+ }
+ }
+
+ impl Drop for Id {
+ fn drop(&mut self) {
+ println!("dropping Id {}", self.count);
+ self.count = 0;
+ }
+ }
+}
+
+trait HasId {
+ fn count(&self) -> usize;
+}
+
+#[derive(Debug)]
+struct CheckId<T:HasId> {
+ v: T
+}
+
+#[allow(non_snake_case)]
+fn CheckId<T:HasId>(t: T) -> CheckId<T> { CheckId{ v: t } }
+
+impl<T:HasId> Drop for CheckId<T> {
+ fn drop(&mut self) {
+ assert!(self.v.count() > 0);
+ }
+}
+
+#[derive(Debug)]
+struct C<'a> {
+ id: Id,
+ v: Vec<CheckId<Cell<Option<&'a C<'a>>>>>,
+}
+
+impl<'a> HasId for Cell<Option<&'a C<'a>>> {
+ fn count(&self) -> usize {
+ match self.get() {
+ None => 1,
+ Some(c) => c.id.count(),
+ }
+ }
+}
+
+impl<'a> C<'a> {
+ fn new() -> C<'a> {
+ C { id: Id::new(), v: Vec::new() }
+ }
+}
+
+fn f<'a>(arena: &'a TypedArena<C<'a>>) {
+ let c1 = arena.alloc(C::new());
+ let c2 = arena.alloc(C::new());
+ let c3 = arena.alloc(C::new());
+
+ c1.v.push(CheckId(Cell::new(None)));
+ c1.v.push(CheckId(Cell::new(None)));
+ c2.v.push(CheckId(Cell::new(None)));
+ c2.v.push(CheckId(Cell::new(None)));
+ c3.v.push(CheckId(Cell::new(None)));
+ c3.v.push(CheckId(Cell::new(None)));
+
+ c1.v[0].v.set(Some(c2));
+ c1.v[1].v.set(Some(c3));
+ c2.v[0].v.set(Some(c2));
+ c2.v[1].v.set(Some(c3));
+ c3.v[0].v.set(Some(c1));
+ c3.v[1].v.set(Some(c2));
+}
+
+fn main() {
+ let arena = TypedArena::default();
+ f(&arena);
+} //~^ ERROR `arena` does not live long enough