add testcase for 87076
add testcase for 87076

using
https://github.com/rust-lang/rust/issues/87076#issuecomment-878090143 as
testcase

graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust