Trait Warn

pub trait Warn {
    type Error;

    // Required method
    fn warn(&mut self, message: &[u8]) -> Result<(), Self::Error>;
}

Emit warnings during interpreter execution to stderr.

Some functionality required to be compliant with ruby/spec is deprecated or invalid behavior and ruby/spec expects a warning to be emitted to $stderr using the Warning module from the standard library.

Required Associated Types

type Error

Concrete error type for errors encountered when outputting warnings.

Required Methods

fn warn(&mut self, message: &[u8]) -> Result<(), Self::Error>

Emit a warning message using Warning#warn.

This method appends newlines to message if necessary.

Errors

Interpreters should issue warnings by calling the warn method on the Warning module.

If an exception is raised on the interpreter, then an error is returned.

Implementors