Unable to build a project using Conrod with feature glium

[IohannRabeson]

Hi! I'm trying to build an empty application with Conrod (v0.61.1) as dependency on OSX (high sierra 10.13.6) and I got this error:

error[E0282]: type annotations needed
   --> /Users/iota/.cargo/registry/src/github.com-1ecc6299db9ec823/cocoa-0.15.0/src/appkit.rs:526:9
    |
526 |         msg_send![self, releaseGlobally];
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ consider giving `result` a type
    |
    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error[E0282]: type annotations needed
    --> /Users/iota/.cargo/registry/src/github.com-1ecc6299db9ec823/cocoa-0.15.0/src/appkit.rs:2849:9
     |
2849 |         msg_send![self, setBezelStyle:style];
     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ consider giving `result` a type
     |
     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error[E0282]: type annotations needed
    --> /Users/iota/.cargo/registry/src/github.com-1ecc6299db9ec823/cocoa-0.15.0/src/appkit.rs:3454:9
     |
3454 |         msg_send![self, setEditable:editable];
     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ consider giving `result` a type
     |
     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error[E0282]: type annotations needed
    --> /Users/iota/.cargo/registry/src/github.com-1ecc6299db9ec823/cocoa-0.15.0/src/appkit.rs:3457:9
     |
3457 |         msg_send![self, setStringValue:label];
     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ consider giving `result` a type
     |
     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

What am I doing wrong? According to cargo-tree this crate cocoa 0.15.0 is required by: glutin v0.17.0 required by glium v0.22.0 required by conrod v0.61.1

[alvinhochun]

I don't know if this would actually fix your issue, but would you consider trying with conrod_core v0.70 and conrod_glium v0.70? conrod v0.61 is quite outdated.