Add a test for the fix to issue #43058
Add a test for the fix to issue #43058

Followed the instructions laid out here https://github.com/rust-lang/rust/issues/43058#issuecomment-378389971

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