66 lines
1.4 KiB
Rust
66 lines
1.4 KiB
Rust
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use std::error::Error as StdError;
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use std::io;
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use thiserror::Error;
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#[derive(Error, Debug)]
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#[error("implicit source")]
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pub struct ImplicitSource {
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source: io::Error,
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}
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#[derive(Error, Debug)]
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#[error("explicit source")]
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pub struct ExplicitSource {
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source: String,
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#[source]
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io: io::Error,
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}
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#[derive(Error, Debug)]
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#[error("boxed source")]
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pub struct BoxedSource {
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#[source]
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source: Box<dyn StdError + Send + 'static>,
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}
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#[test]
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fn test_implicit_source() {
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let io = io::Error::new(io::ErrorKind::Other, "oh no!");
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let error = ImplicitSource { source: io };
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error.source().unwrap().downcast_ref::<io::Error>().unwrap();
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}
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#[test]
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fn test_explicit_source() {
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let io = io::Error::new(io::ErrorKind::Other, "oh no!");
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let error = ExplicitSource {
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source: String::new(),
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io,
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};
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error.source().unwrap().downcast_ref::<io::Error>().unwrap();
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}
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#[test]
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fn test_boxed_source() {
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let source = Box::new(io::Error::new(io::ErrorKind::Other, "oh no!"));
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let error = BoxedSource { source };
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error.source().unwrap().downcast_ref::<io::Error>().unwrap();
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}
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macro_rules! error_from_macro {
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($($variants:tt)*) => {
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#[derive(Error)]
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#[derive(Debug)]
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pub enum MacroSource {
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$($variants)*
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}
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}
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}
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// Test that we generate impls with the proper hygiene
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#[rustfmt::skip]
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error_from_macro! {
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#[error("Something")]
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Variant(#[from] io::Error)
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}
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