feat: mman `NonNull` #36

Job	Run time
macos	1m 23s
rust_stable	1m 38s
linux_native_builds (x86_64-unknown-linux-gnu)	1m 39s
minver	12s
linux_native_builds (x86_64-unknown-linux-musl)	58s
rustfmt	7s
tier3 (x86_64-unknown-dragonfly)	1m 28s
tier3 (x86_64-unknown-openbsd)	53s
tier3 (armv7-unknown-linux-uclibceabihf)	1m 19s
tier3 (x86_64-unknown-haiku)	49s
redox	54s
cross (arm-unknown-linux-gnueabi)	2m 14s
cross_compiling (aarch64-linux-android)	34s
cross (armv7-unknown-linux-gnueabihf)	1m 30s
cross_compiling (arm-linux-androideabi)	38s
cross (i686-unknown-linux-gnu)	1m 34s
cross_compiling (armv7-linux-androideabi)	33s
cross_compiling (i686-linux-android)	30s
cross_compiling (x86_64-linux-android)	47s
cross (i686-unknown-linux-musl)	1m 30s
cross_compiling (arm-unknown-linux-musleabi)	37s
cross (mips-unknown-linux-gnu)	2m 12s
cross_compiling (x86_64-unknown-fuchsia)	34s
cross (mips64-unknown-linux-gnuabi64)	1m 35s
cross_compiling (x86_64-unknown-illumos)	31s
cross (mips64el-unknown-linux-gnuabi64)	2m 19s
cross_compiling (aarch64-apple-ios, true)	25s
cross (mipsel-unknown-linux-gnu)	1m 29s
cross_compiling (powerpc64-unknown-linux-gnu)	46s
cross (powerpc64le-unknown-linux-gnu)	1m 30s
cross_compiling (s390x-unknown-linux-gnu)	44s
cross_compiling (x86_64-unknown-linux-gnux32)	41s
cross_compiling (x86_64-unknown-netbsd)	26s
	34m 59s

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