vendor/thiserror/tests/test_from.rs

   1 use std::io;
   2 use thiserror::Error;
   3
   4 #[derive(Error, Debug)]
   5 #[error("...")]
   6 pub struct ErrorStruct {
   7     #[from]
   8     source: io::Error,
   9 }
  10
  11 #[derive(Error, Debug)]
  12 #[error("...")]
  13 pub struct ErrorStructOptional {
  14     #[from]
  15     source: Option<io::Error>,
  16 }
  17
  18 #[derive(Error, Debug)]
  19 #[error("...")]
  20 pub struct ErrorTuple(#[from] io::Error);
  21
  22 #[derive(Error, Debug)]
  23 #[error("...")]
  24 pub struct ErrorTupleOptional(#[from] Option<io::Error>);
  25
  26 #[derive(Error, Debug)]
  27 #[error("...")]
  28 pub enum ErrorEnum {
  29     Test {
  30         #[from]
  31         source: io::Error,
  32     },
  33 }
  34
  35 #[derive(Error, Debug)]
  36 #[error("...")]
  37 pub enum ErrorEnumOptional {
  38     Test {
  39         #[from]
  40         source: Option<io::Error>,
  41     },
  42 }
  43
  44 #[derive(Error, Debug)]
  45 #[error("...")]
  46 pub enum Many {
  47     Any(#[from] anyhow::Error),
  48     Io(#[from] io::Error),
  49 }
  50
  51 fn assert_impl<T: From<io::Error>>() {}
  52
  53 #[test]
  54 fn test_from() {
  55     assert_impl::<ErrorStruct>();
  56     assert_impl::<ErrorStructOptional>();
  57     assert_impl::<ErrorTuple>();
  58     assert_impl::<ErrorTupleOptional>();
  59     assert_impl::<ErrorEnum>();
  60     assert_impl::<ErrorEnumOptional>();
  61     assert_impl::<Many>();
  62 }