Critque of Rust's collection types

[Kagamin via Digitalmars-d]

On Wednesday, 14 September 2016 at 00:36:39 UTC, Walter Bright 
wrote:
> Of particular interest is the advocacy of collision attack 
> resistance. Is anyone interested in exploring this w.r.t. D's 
> builtin hashes?

Perl's approach is probably good enough 
https://issues.dlang.org/show_bug.cgi?id=14414
Reversibility of the hash looks irrelevant for dos attack.