--- /dev/null
+// compile-flags: -C opt-level=0
+#![crate_type = "lib"]
+
+pub enum ApiError {}
+#[allow(dead_code)]
+pub struct TokioError {
+ b: bool,
+}
+pub enum Error {
+ Api {
+ source: ApiError,
+ },
+ Ethereum,
+ Tokio {
+ source: TokioError,
+ },
+}
+struct Api;
+impl IntoError<Error> for Api
+{
+ type Source = ApiError;
+ // CHECK-LABEL: @into_error
+ // CHECK: unreachable
+ // Also check the next two instructions to make sure we do not match against `unreachable`
+ // elsewhere in the code (e.g., in the closure bode).
+ // CHECK-NEXT: load
+ // CHECK-NEXT: ret
+ #[no_mangle]
+ fn into_error(self, error: Self::Source) -> Error {
+ Error::Api {
+ source: (|v| v)(error),
+ }
+ }
+}
+
+pub trait IntoError<E>
+{
+ /// The underlying error
+ type Source;
+
+ /// Combine the information to produce the error
+ fn into_error(self, source: Self::Source) -> E;
+}