Crate dispair

Dispair

Dispair (Disp-Err) is a zero-dependency (other than std) library that provides a simple wrapper struct that implements Error for any type that implements both Debug and Display.

use dispair::Dispair;
use std::error::Error;

#[derive(Debug)]
struct TestStruct;

impl core::fmt::Display for TestStruct {
   fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
       core::fmt::Debug::fmt(&self, f)
   }
}

fn main() {
   
   // Wrap `TestStruct` (which doesn't implement `Error`) in `Dispair` and return it.
   let err = Dispair(TestStruct);
   
   // Display just passes through to the wrapped value
   assert_eq!(format!("{}", err), "TestStruct");
   
   // Debug, however, does show `Dispair`.
   assert_eq!(format!("{:?}", err), "Dispair(TestStruct)");

   // We should be able to convert it into a `Box<dyn Error>`
   let err_boxed: Box<dyn Error> = Box::new(err);

   // And this should print nicely
   assert_eq!(err_boxed.to_string(), "TestStruct");
}

Structs

Dispair

Dispair