Aria
I'm up for this, though I'm not entirely clear what this applies to as the link you gave is populated for me. Do you mean like [empty search results](https://old.reddit.com/r/dankmemes/search?q=flair%3Aactually_funny&restrict_sr=on&sort=relevance&t=all)?
In my opinion this isn't needed & should be in your routing function, letting you handle errors correctly. Users aren't passing you a Todo; they're passing you a reference to...
Will do, in a fork or just put the patch on a gist?
[First pass at email regex](https://regexr.com/3sj5q)
The easiest way on nightly would be to use [`Range::contains()`](https://doc.rust-lang.org/std/ops/trait.RangeBounds.html#method.contains) but that's experimental right now. It should probably default to false if the range is invalid.
Inclusive range is in stable now (1.26.0) so we can use it, contains & stuff are basically just convenience.
[First pass at URL regex](https://regexr.com/3sj7a)
Something like `[printschema.whatever]` with the usual properties could work if it inherited from the base `printschema`, I can't think of many other ways to do it & support filtering that...
It seems like this is already being done with `nightly-2018-02-02`, Just tried compiling with `nightly-2018-02-01` and it failed with `can't find crate for 'rustc_const_eval'` (clippy-lints).