skiplist: Fix memory leaks in SkipList test

ci/miri.sh

@@ -24,14 +24,9 @@ MIRIFLAGS="-Zmiri-strict-provenance -Zmiri-symbolic-alignment-check -Zmiri-disab
 MIRIFLAGS="-Zmiri-strict-provenance -Zmiri-symbolic-alignment-check -Zmiri-disable-isolation -Zmiri-tree-borrows" \
     cargo miri test \
     -p crossbeam-epoch \
+    -p crossbeam-skiplist \
     -p crossbeam 2>&1 | ts -i '%.s  '
 
-# Use Tree Borrows instead of Stacked Borrows because epoch is not compatible with Stacked Borrows: https://github.com/crossbeam-rs/crossbeam/issues/545#issuecomment-1192785003
-# -Zmiri-ignore-leaks is needed for https://github.com/crossbeam-rs/crossbeam/issues/614
-MIRIFLAGS="-Zmiri-strict-provenance -Zmiri-symbolic-alignment-check -Zmiri-disable-isolation -Zmiri-tree-borrows -Zmiri-ignore-leaks" \
-    cargo miri test \
-    -p crossbeam-skiplist 2>&1 | ts -i '%.s  '
-
 # Use Tree Borrows instead of Stacked Borrows because epoch is not compatible with Stacked Borrows: https://github.com/crossbeam-rs/crossbeam/issues/545#issuecomment-1192785003
 # -Zmiri-compare-exchange-weak-failure-rate=0.0 is needed because some sequential tests (e.g.,
 # doctest of Stealer::steal) incorrectly assume that sequential weak CAS will never fail.

ci/san.sh

@@ -15,21 +15,10 @@ rustup component add rust-src
 # `--cfg crossbeam_sanitize`.
 cargo clean
 RUSTFLAGS="${RUSTFLAGS:-} -Z sanitizer=address --cfg crossbeam_sanitize" \
-    cargo test --all --release --target x86_64-unknown-linux-gnu --tests \
-    --exclude crossbeam-skiplist --exclude benchmarks -- --test-threads=1
-
-# There are memory leaks in crossbeam-skiplist.
-# https://github.com/crossbeam-rs/crossbeam/issues/614
-RUSTFLAGS="${RUSTFLAGS:-} -Z sanitizer=address --cfg crossbeam_sanitize" \
-    cargo test --release --target x86_64-unknown-linux-gnu \
-    -p crossbeam-skiplist --test map --test set
-ASAN_OPTIONS="detect_leaks=0" \
-    RUSTFLAGS="${RUSTFLAGS:-} -Z sanitizer=address --cfg crossbeam_sanitize" \
-    cargo test --release --target x86_64-unknown-linux-gnu \
-    -p crossbeam-skiplist --tests
+    cargo test -Z build-std --all --release --target x86_64-unknown-linux-gnu --tests --exclude benchmarks -- --test-threads=1
 
 RUSTFLAGS="${RUSTFLAGS:-} -Z sanitizer=address --cfg crossbeam_sanitize" \
-    cargo run \
+    cargo run -Z build-std \
     --release \
     --target x86_64-unknown-linux-gnu \
     --example sanitize \