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terms of `mconcat`.
* `GHC.Conc.Sync.listThreads` was added, allowing the user to list the threads
(both running and blocked) of the program.
+ * `GHC.Conc.Sync.labelThreadByteArray#` was added, allowing the user to specify
+ a thread label by way of a `ByteArray#` containing a UTF-8-encoded string.
+ The old `GHC.Conc.Sync.labelThread` is now implemented in terms of this
+ function.
## 4.17.0.0 *TBA*