tool_attributes feature stops working when rust_2018_preview feature is enabled #51277
Description
If both features tool_attributes and rust_2018_preview are enabled, scoped attributes lead to the error message
error[E0658]: paths of length greater than one in macro invocations are currently unstable (see issue #38356) --> src/main.rs:4:3 | 4 | #[rustfmt::skip] | ^^^^^^^^^^^^^ | = help: add #![feature(proc_macro_path_invoc)] to the crate attributes to enable I think this can be fixed by doing this #47773 (review) right. I would like to try and fix this, but I need some pointers where to start.
This needs to be fixed, so clippy can use the new scoped attributes instead of the old cfg_attrs (rust-lang/rust-clippy#2823).
I tried this code:
#![feature(tool_attributes)] #![feature(rust_2018_preview)] #[rustfmt::skip] fn main() { //code not to format }Playground
This should compile without errors, but gives the error above
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rustc 1.28.0-nightly (5d0631a64 2018-05-30) binary: rustc commit-hash: 5d0631a6438cf30cac236b7176371663e35c8d07 commit-date: 2018-05-30 host: x86_64-unknown-linux-gnu release: 1.28.0-nightly LLVM version: 6.0 Metadata
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