Mark ab/6881855 as merged am: 87c70d003a am: 9382cdc33e

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/rust/crates/thiserror-impl/+/13112959

Change-Id: Id0de0dff38d8c0f2185afd9f0fabefb3c02215ee