Test cargo incr comp

test.sh

#!/usr/bin/env bash
cargo +nightly build --release 2> /dev/null
rm -rf ./target/

echo 'full build' > timings.txt
(time cargo +nightly build --release 2>/dev/null) 2>> timings.txt

export CARGO_INCREMENTAL=1
rm -rf ./target/
echo -e '\nfull incremental build' >> timings.txt
(time cargo +nightly build --release 2>/dev/null) 2>> timings.txt

touch ./src/lib.rs
echo -e '\ntouch lib.rs' >> timings.txt
(time cargo +nightly build --release 2>/dev/null) 2>> timings.txt

echo '#[allow(unused)] fn noop() {}' >> ./src/lib.rs
echo -e '\nadd noop' >> timings.txt
(time cargo +nightly build --release 2>/dev/null) 2>> timings.txt

# reset to earlier state
git checkout src/lib.rs

cat timings.txt