Static METHOD_CALL_ON_DIVERGING_INFER_VAR 

pub static METHOD_CALL_ON_DIVERGING_INFER_VAR: &Lint

The method_call_on_diverging_infer_var lint detects situations in which a method is called on a value resulting from a never-to-any coercion, without necessary information to infer a type for it.

Example

 fn main() {
     let x = panic!();
     x.clone();
 }

{{produces}}

Explanation

Rust does not generally allow calling methods on values which do not have a known type, such a result of a never-to-any coercion with no type specified.

To aid with transition of code calling methods on Infallible after changing Infallible to be an alias for !, rustc temporarily allows such calls. This will (once again) become an error in the future.

Thanks to never-to-any coercion you can replace method calls on ! with the use of the ! variable, or an as cast to an explicit type:

- x.clone()
+ x

- result.map(|x| x.convert_error())?;
+ result.map(|x| x as ErrorType)?;