Merge pull request #187 from dtolnay/anyhowbacktrace

Add test of getting backtrace from an anyhow source

Cargo.toml

@@ -16,7 +16,7 @@ rust-version = "1.31"
 thiserror-impl = { version = "=1.0.34", path = "impl" }
 
 [dev-dependencies]
-anyhow = "1.0"
+anyhow = "1.0.64"
 ref-cast = "1.0"
 rustversion = "1.0"
 trybuild = { version = "1.0.49", features = ["diff"] }

tests/test_backtrace.rs

@@ -86,6 +86,13 @@ pub mod structs {
         backtrace: Arc<Backtrace>,
     }
 
+    #[derive(Error, Debug)]
+    #[error("...")]
+    pub struct AnyhowBacktrace {
+        #[backtrace]
+        source: anyhow::Error,
+    }
+
     #[test]
     fn test_backtrace() {
         let error = PlainBacktrace {
@@ -121,6 +128,11 @@ pub mod structs {
 
         let error = ArcBacktraceFrom::from(Inner);
         assert!(any::request_ref::<Backtrace>(&error).is_some());
+
+        let error = AnyhowBacktrace {
+            source: anyhow::Error::msg("..."),
+        };
+        assert!(any::request_ref::<Backtrace>(&error).is_some());
     }
 }