Dead code doesn't trigger dead_code lint

[GuillaumeGomez]

In askama-rs/askama#311, we realized that an unused (private) method was not triggering the dead_code lint. The method is calling itself, but that's the only call for this method and I wonder if it's the problem here (although I cannot seem to replicate the bug in smaller code...).

The code not triggering the lint can be found here.

[cyrgani]

Isn't that just because its identifier starts with _ and those are intentionally ignored by dead_code?
https://doc.rust-lang.org/rustc/lints/listing/warn-by-default.html#explanation-18

[GuillaumeGomez]

I'm ashamed for not having thought to that... Thanks!