--- /dev/null
+#![deny(clippy::all, clippy::pedantic)]
+
+use std::io;
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+#[error("...")]
+pub struct ErrorStruct {
+ #[from]
+ source: io::Error,
+}
+
+#[derive(Error, Debug)]
+#[error("...")]
+pub struct ErrorTuple(#[from] io::Error);
+
+#[derive(Error, Debug)]
+#[error("...")]
+pub enum ErrorEnum {
+ Test {
+ #[from]
+ source: io::Error,
+ },
+}
+
+#[derive(Error, Debug)]
+#[error("...")]
+pub enum Many {
+ Any(#[from] anyhow::Error),
+ Io(#[from] io::Error),
+}
+
+fn assert_impl<T: From<io::Error>>() {}
+
+#[test]
+fn test_from() {
+ assert_impl::<ErrorStruct>();
+ assert_impl::<ErrorTuple>();
+ assert_impl::<ErrorEnum>();
+ assert_impl::<Many>();
+}