warning: there was one deprecation warning (since 2.11.0)
warning: there were two deprecation warnings (since 2.12.0)
warning: there were three deprecation warnings in total; re-run with -deprecation for details
3-2-1: true
3-2-1: true
apply
3: true
3: true
1: true
1: true
top
3: true
3: true
pop
2-1: true
3: true
2-1: true