Conrod: Building examples: compile error on converting `winit::Event`

[malikolivier]

I am just getting started with conrod. I am reading the doc and building the examples.
I get the following compile error on this test project implementing the all_winit_glium example here:
This test project is the all_winit_glium example copy-pasted as is in its own repo.

$ cargo --version
cargo 0.26.0-nightly (1d6dfea44 2018-01-26)
$ rustc --version
rustc 1.26.0-nightly (c9334404f 2018-03-05)
$ cargo run
   Compiling conrod-test v0.1.0 (file:///home/malik/workspace/veille/rust/conrod-test)
error[E0308]: mismatched types
  --> src/main.rs:89:76
   |
89 |                 if let Some(event) = conrod::backend::winit::convert_event(event.clone(), &display) {
   |                                                                            ^^^^^^^^^^^^^ expected enum `winit::events::Event`, found enum `conrod::<unnamed>::<unnamed>::Event`
   |
   = note: expected type `winit::events::Event`
              found type `conrod::<unnamed>::<unnamed>::Event`
note: Perhaps two different versions of crate `winit` are being used?
  --> src/main.rs:89:76
   |
89 |                 if let Some(event) = conrod::backend::winit::convert_event(event.clone(), &display) {
   |                                                                            ^^^^^^^^^^^^^

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain E0308"
error: Could not compile `conrod-test`.

To learn more, run the command again with --verbose.

Very strangely, I have no problem to build and run the examples when I clone the conrod repo.
I don't understand what I am doing wrong. The compiler seems to be right in that this is an error:

• convert_event takes a winit::Event as argument: https://github.com/PistonDevelopers/conrod/blob/master/src/backend/winit.rs#L48
• while the next method of the EventLoop structure does return a vector of glium::glutin::Event: https://github.com/PistonDevelopers/conrod/blob/master/examples/support/mod.rs#L383

May be related to #1130?
I tried downgrading winit to 0.8.3, but the same error occurs.

[alberdingk-thijm]

I'm also having this issue, after having copy-pasted the support/mod.rs code from the conrod/examples into a new repository and then calling it from main.rs in the same way as the examples do so.
Interestingly, the API reference suggests that convert_event does in fact take a glium::glutin::Event when you check the type of e: Event in docs.rs, although the source says the right thing.

[mitchmindtree]

Thanks so much for the issue and sorry for the delay!

It looks like this is due to conrod's winit dependency being a different version to the winit used via glium (via glutin) so although the Event type is correct, they're technically not the same type as they're from different crate versions. I tested both your test and the examples... I find it very strange that the examples compile at all.

I'm going to do a conrod update very soon (once tomaka/winit#435 lands and is published) and I'll be sure to fix this at the same time.

[expenses]

Whats happening with this? winit being bumped to 0.17 would be great

[alvinhochun]

Closing outdated issue.