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-rw-r--r--src/libstd/task/spawn.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstd/task/spawn.rs b/src/libstd/task/spawn.rs
index 87e9296657f..bc409e06633 100644
--- a/src/libstd/task/spawn.rs
+++ b/src/libstd/task/spawn.rs
@@ -323,6 +323,7 @@ impl Drop for TCB {
     // Runs on task exit.
     fn finalize(&self) {
         unsafe {
+            // FIXME(#4330) Need self by value to get mutability.
             let this: &mut TCB = transmute(self);
 
             // If we are failing, the whole taskgroup needs to die.