Concatenate errors from E1 followed by those from E2.
The resulting Error is unchecked, and contains the ErrorInfo(s), if any, contained in E1, followed by the ErrorInfo(s), if any, contained in E2.
An Error containing the payloads of E1 followed by those of E2.
| Name | Description |
|---|---|
| E1 | First error (or success) whose payloads come first. |
| E2 | Second error (or success) whose payloads are appended. |