Compile fail on nightly (9fae15374 2018-05-13)

[CAD97]

It looks like the change is rust-lang/rust#50536. ParamEnv::can_type_implement_copy went from (TyCtxt, Ty, Span) -> Result<_, _> to (TyCtxt, Ty) -> Result<_, _>.

It looks like the only place this is called is

https://github.com/rust-lang-nursery/rust-clippy/blob/e6735dd3279684c9702851ad9f2e1cc2d7a53a87/clippy_lints/src/needless_pass_by_value.rs#L204

which should be fixable by just removing the span argument.