add system warning #31

Job	Run time
lint-build	44s
rustfmt	9s
test-flake (x86_64-unknown-linux-gnu)	1m 4s
test (stable, x86_64-unknown-linux-gnu)	3m 6s
test-flake (x86_64-unknown-linux-musl)	1m 11s
test (stable, x86_64-unknown-linux-musl)	5m 13s
test-wasm	1m 4s
test-flake (aarch64-unknown-linux-musl)	1m 12s
test (stable, aarch64-unknown-linux-musl)	2m 2s
test-flake (x86_64-apple-darwin)	4m 29s
test (stable, x86_64-apple-darwin)	6m 51s
test-flake (aarch64-apple-darwin, macos-14)	1m 59s
test (stable, x86_64-pc-windows-msvc)	7m 6s
test (stable, aarch64-apple-darwin, macos-14, false, true, true)	2m 58s
test-projects	1m 35s
	40m 43s

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