1.9.0 (July 19, 2021)

Added

• net: allow customized I/O operations for TcpStream (#3888)
• sync: add getter for the mutex from a guard (#3928)
• task: expose nameable future for TaskLocal::scope (#3273)

Fixed

• Fix leak if output of future panics on drop (#3967)
• Fix leak in LocalSet (#3978)

Changes

• runtime: reorganize parts of the runtime (#3909, #3939, #3950, #3955, #3980)
• sync: clean up OnceCell (#3945)
• task: remove mutex in JoinError (#3959)