vendor/failure_derive/tests/custom_type_bounds.rs

   1 #[macro_use]
   2 extern crate failure;
   3
   4 use std::fmt::Debug;
   5
   6 use failure::Fail;
   7
   8 #[derive(Debug, Fail)]
   9 #[fail(display = "An error has occurred.")]
  10 pub struct UnboundedGenericTupleError<T: 'static + Debug + Send + Sync>(T);
  11
  12 #[test]
  13 fn unbounded_generic_tuple_error() {
  14     let s = format!("{}", UnboundedGenericTupleError(()));
  15     assert_eq!(&s[..], "An error has occurred.");
  16 }
  17
  18 #[derive(Debug, Fail)]
  19 #[fail(display = "An error has occurred: {}", _0)]
  20 pub struct FailBoundsGenericTupleError<T: Fail>(T);
  21
  22 #[test]
  23 fn fail_bounds_generic_tuple_error() {
  24     let error = FailBoundsGenericTupleError(UnboundedGenericTupleError(()));
  25     let s = format!("{}", error);
  26     assert_eq!(&s[..], "An error has occurred: An error has occurred.");
  27 }
  28
  29 pub trait NoDisplay: 'static + Debug + Send + Sync {}
  30
  31 impl NoDisplay for &'static str {}
  32
  33 #[derive(Debug, Fail)]
  34 #[fail(display = "An error has occurred: {:?}", _0)]
  35 pub struct CustomBoundsGenericTupleError<T: NoDisplay>(T);
  36
  37 #[test]
  38 fn custom_bounds_generic_tuple_error() {
  39     let error = CustomBoundsGenericTupleError("more details unavailable.");
  40     let s = format!("{}", error);
  41     assert_eq!(
  42         &s[..],
  43         "An error has occurred: \"more details unavailable.\""
  44     );
  45 }