[michaelmcmillan]

Which, again, proves my point: If your test suite can be reduced to a type checker you are doing it wrong. That being said, it does not mean that a type checker won't catch many of the same bugs tests do - but no more than a subset.

[guscost]

Yes, good tests is the only way to eliminate most bugs. But aside from overhead to add tools to a project (don't underestimate the potential difficulty of this), a type checker can cover its subset for free, and then you can get better test coverage overall.