250             Err(err) => {  in test_channel_type_unmarshal_invalid()
251                 if let Some(&Error::InvalidChannelType(0x11)) = err.downcast_ref::<Error>() {  in test_channel_type_unmarshal_invalid()
256                     err,  in test_channel_type_unmarshal_invalid()
268             Err(err) => {  in test_channel_type_unmarshal_unexpected_end_of_buffer()
272                 }) = err.downcast_ref::<Error>()  in test_channel_type_unmarshal_unexpected_end_of_buffer()
278                     err,  in test_channel_type_unmarshal_unexpected_end_of_buffer()
342             Err(err) => {  in test_channel_open_unmarshal_invalid_channel_type()
343                 if let Some(&Error::InvalidChannelType(0x11)) = err.downcast_ref::<Error>() {  in test_channel_open_unmarshal_invalid_channel_type()
348                     err,  in test_channel_open_unmarshal_invalid_channel_type()
360             Err(err) => {  in test_channel_open_unmarshal_unexpected_end_of_buffer()
364                 }) = err.downcast_ref::<Error>()  in test_channel_open_unmarshal_unexpected_end_of_buffer()
370                     err,  in test_channel_open_unmarshal_unexpected_end_of_buffer()
388             Err(err) => {  in test_channel_open_unmarshal_unexpected_length_mismatch()
392                 }) = err.downcast_ref::<Error>()  in test_channel_open_unmarshal_unexpected_length_mismatch()
398                     err,  in test_channel_open_unmarshal_unexpected_length_mismatch()