Add ui test of Generic<&'a str> source

tests/ui/lifetime.rs

@@ -1,3 +1,4 @@
+use std::fmt::Debug;
 use thiserror::Error;
 
 #[derive(Error, Debug)]
@@ -8,6 +9,16 @@ struct Error<'a>(#[from] Inner<'a>);
 #[error("{0}")]
 struct Inner<'a>(&'a str);
 
+#[derive(Error, Debug)]
+enum Enum<'a> {
+    #[error("error")]
+    Foo(#[from] Generic<&'a str>),
+}
+
+#[derive(Error, Debug)]
+#[error("{0:?}")]
+struct Generic<T: Debug>(T);
+
 fn main() -> Result<(), Error<'static>> {
     Err(Error(Inner("some text")))
 }

tests/ui/lifetime.stderr

@@ -1,5 +1,11 @@
 error: non-static lifetimes are not allowed in the source of an error, because std::error::Error requires the source is dyn Error + 'static
- --> $DIR/lifetime.rs:5:26
+ --> $DIR/lifetime.rs:6:26
   |
-5 | struct Error<'a>(#[from] Inner<'a>);
+6 | struct Error<'a>(#[from] Inner<'a>);
   |                          ^^^^^^^^^
+
+error: non-static lifetimes are not allowed in the source of an error, because std::error::Error requires the source is dyn Error + 'static
+  --> $DIR/lifetime.rs:15:17
+   |
+15 |     Foo(#[from] Generic<&'a str>),
+   |                 ^^^^^^^^^^^^^^^^