Fix nightly test matching rustc "warning" output.
Fix nightly test matching rustc "warning" output.

nipunn1313/cargo,tshepang/cargo,eminence/cargo,tshepang/cargo,rust-lang/cargo,rust-lang/cargo,tsurai/cargo,rustyhorde/cargo,eminence/cargo,tshepang/cargo,rust-lang/cargo,tsurai/cargo,rust-lang/cargo,tshepang/cargo,eminence/cargo,tsurai/cargo,nipunn1313/cargo,eminence/cargo,nipunn1313/cargo,tsurai/cargo,rustyhorde/cargo,nipunn1313/cargo,rustyhorde/cargo,tsurai/cargo,rustyhorde/cargo