--- /dev/null
+error[E0599]: the method `as_dyn_error` exists for struct `NotError`, but its trait bounds were not satisfied
+ --> $DIR/source-struct-not-error.rs:9:5
+ |
+4 | struct NotError;
+ | ----------------
+ | |
+ | method `as_dyn_error` not found for this
+ | doesn't satisfy `NotError: AsDynError`
+ | doesn't satisfy `NotError: std::error::Error`
+...
+9 | source: NotError,
+ | ^^^^^^ method cannot be called on `NotError` due to unsatisfied trait bounds
+ |
+ = note: the following trait bounds were not satisfied:
+ `NotError: std::error::Error`
+ which is required by `NotError: AsDynError`