Use try!() instead of task::try() in test failure reporting
Use try!() instead of task::try() in test failure reporting

… when shelling out to `colordiff`

frewsxcv/rust-cssparser,tempbottle/rust-cssparser,disjukr/rust-cssparser,notriddle/rust-cssparser,disjukr/rust-cssparser,servo/rust-cssparser,servo/rust-cssparser,frewsxcv/rust-cssparser,tempbottle/rust-cssparser,notriddle/rust-cssparser