Lots of warnings: the type of this value must be known in this context

[metux]

Hi folks,

I'm getting a lot of warnings like this:

warning[E0619]: the type of this value must be known in this context
--> /home/nekrad/src/moz/servo/target/release/build/script-917cc22c0e8f3269/out/Bindings/XMLHttpRequestEventTargetBinding.rs:1088:74
|
1088 | EventTargetBinding::GetConstructorObject(cx, global, >interface_proto.handle_mut());
| > ^^^^^^^^^^
|
= note: this will be made into a hard error in a future version of the compiler

warning[E0619]: the type of this value must be known in this context
--> /home/nekrad/src/moz/servo/target/release/build/script-917cc22c0e8f3269/out/Bindings/XMLHttpRequestEventTargetBinding.rs:1102:51
|
1102 | interface.handle_mut());
| ^^^^^^^^^^
|
= note: this will be made into a hard error in a future version of the compiler

What does that mean ?

I'm using a pretty fresh rustc (updated few days ago) - did anything
vital change in the compiler/language ?

--mtx

[SimonSapin]

This is rust-lang/rust#46906. In general, using a version other than the one specified in the rust-toolchain file is unsupported. If you use rustup or build with ./mach build the correct version is downloaded automatically.

At the moment, upgrading is blocked on #19519.

[metux]

Okay. I had upgraded rust, hoping that #[cfg()] on if statements would be implemented now ...

Nevertheless, this issue should be fixed sooner or later.