Use of selfdestruct (removal scheduled by EIP-6780), deprecated keywords, or constructs that can be abused to destroy contracts or that signal outdated, risky patterns.
// Remove selfdestruct; use pause + withdrawal instead for decommissioning.
Largest recorded losses in the same failure class — related, not the same bug:
The SaferICO scanner runs 201 detectors over your Solidity source, SAFE-0076 among them. Paste an address or the source itself — a small per-scan fee, shown before you sign, or unlimited on any plan.