Macro error_struct 

macro_rules! error_struct {
    ($struct_name:ident $( {
        $( $field_name:ident : $field_type:ty ),* $(,)?
    } )?$(,)?) => { ... };
}

Facilitates the creation of error structures with debug display

Example

use rs42::error_struct;

error_struct!(ErrorStructName);

error_struct!(
    OtherErrorStructName {
        data: u32,
    },
);