Features from optional dependencies
- mio_06 implicit feature
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Enables mio ^0.6.14
0.2.59 added mq_timed{send,receive}() and FIONCLEX for Linux and all mq_ functions for solarish
- mio_07 implicit feature
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Enables mio ^0.7.0
0.6.13 drags in libc 0.1 when built with -Z minimal-versions