Syntax for turning off warnings is confusing

[brson]

This means turn off the 'old-vecs' warning:

#[warn(no_old_vecs)];

To me this says 'turn on the no-old-vecs warning'.

[catamorphism]

I also find it confusing, for the same reason.

[Dretch]

#[no_warn(old_vecs)] ?

[graydon]

this is now done with #[allow(...)], closing.