Easily convert typed paths into URIs

[davidpdrsn]

#[derive(TypedPath)] will now also generate TryFrom<_> for Uri for
easily converting paths into URIs for use with Redirect and friends.

Fixes #789

[zys864]

The CI / test-versions (stable) (pull_request)'s command cargo test --all --all-features --all-targets failed due to the unexpected not_send.stderr which occurs on stable-1.59.

I test it on my machine. When I use stable-1.58 version, the test command successes.

But stable-1.59 may have update stderr. May be we should fix it,be the test will failed on older rust version.

Here is stable-1.59 not_send.stderr's ACTUAL OUTPUT

error: future cannot be sent between threads safely
 --> tests/debug_handler/fail/not_send.rs:4:1
  |
4 | async fn handler() {
  | ^^^^^ future returned by `handler` is not `Send`
  |
  = help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `Rc<()>`
note: future is not `Send` as this value is used across an await
 --> tests/debug_handler/fail/not_send.rs:6:13
  |
5 |     let rc = std::rc::Rc::new(());
  |         -- has type `Rc<()>` which is not `Send`
6 |     async {}.await;
  |             ^^^^^^ await occurs here, with `rc` maybe used later
7 | }
  | - `rc` is later dropped here
note: required by a bound in `check`
 --> tests/debug_handler/fail/not_send.rs:4:1
  |
4 | async fn handler() {
  | ^^^^^ required by this bound in `check`

[davidpdrsn]

@zys864 thanks for looking into it! I did think the test failure seemed odd but forgot that a new rust came out yesterday. I'm gonna make a separate PR to fix that in a few hours (have meetings), or you're free to do it if you have the time.

[davidpdrsn]

Hm I just thought that this actually is a breaking change. Someone could have implemented TryFrom<_> for Uri themselves which will conflict with this but I'm fine with shipping 0.2 of axum-extra and axum-macros.

[jplatte]

Should the conversion really be fallible? With parameters being url-encoded, the only case where I could see it failing to convert is if the route itself is invalid (in which case registering it would fail too).

[davidpdrsn]

Ah yes that's true, doesn't need to be fallible!

[davidpdrsn]

@jplatte I've added a to_uri method to the TypedPath trait. That way its not a breaking change and we don't have to change the macro, since we can parse the Display output. What do you think?

[jplatte]

I like it! Changelog / docs still reference TryFrom, otherwise lgtm.