`no_std` compatibility #1530

Job	Run time
Check	54s
Lints	53s
Check Documentation	1m 1s
check-compiles-no-std (x86_64-unknown-none, 2d)	26s
check-compiles-no-std (x86_64-unknown-none, 3d)	27s
Test Suite (windows-latest)	41m 44s
check-compiles-no-std (wasm32v1-none, 2d)	34s
Test Suite (macos-latest)	15m 8s
check-compiles-no-std (wasm32v1-none, 3d)	42s
check-compiles-no-std (thumbv6m-none-eabi, 2d)	14s
check-compiles-no-std (thumbv6m-none-eabi, 3d)	19s
	1h 2m 22s

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