it works fine for me if I add `import sequtils` as the first line.
- sequtils insert sink problem Sixte
- sequtils insert sink problem doofenstein
- sequtils insert sink problem Sixte
- sequtils insert sink problem timothee
- sequtils insert sink problem xigoi
- sequtils insert sink problem Sixte
- sequtils insert sink problem shirleyquirk
