bump Rust; avoid output when CDPATH is set

Author: RalfJung

run-test.sh

@@ -33,6 +33,6 @@ rm -f lib$CRATE
 ln -s "$MIRI_LIB_SRC"/$CRATE lib$CRATE
 
 # run test
-cd ${CRATE}_miri_test
+cd ./${CRATE}_miri_test
 cargo miri setup
 cargo miri test "$@"

rust-version

@@ -1 +1 @@
-nightly-2021-12-25
+nightly-2021-12-31