| extern crate autocfg; | |
| fn main() { | |
| // Normally, cargo will set `OUT_DIR` for build scripts. | |
| let ac = autocfg::AutoCfg::with_dir("target").unwrap(); | |
| // When this feature was stabilized, it also renamed the method to | |
| // `chunk_by`, so it's important to *use* the feature in your probe. | |
| let code = r#" | |
| #![feature(slice_group_by)] | |
| pub fn probe(slice: &[i32]) -> impl Iterator<Item = &[i32]> { | |
| slice.group_by(|a, b| a == b) | |
| } | |
| "#; | |
| if ac.probe_raw(code).is_ok() { | |
| autocfg::emit("has_slice_group_by"); | |
| } | |
| } |