[tmhedberg]

Nowhere in his post did tikhonj suggest that compilation == correctness, even in Haskell. Of course it isn't. The only people making that assumption are wyqueshocec's coworkers, and naturally they're getting burned as a result.

The key point is that a sufficiently expressive type system gets you far closer to correctness on the basis of type checking alone than does a weaker static system like Java's or a dynamic one like JS's. You should still write tests, you just won't have to write as many in order to reach the same degree of confidence in your code.