1 extern crate autocfg;
2 
3 use std::env;
4 
main()5 fn main() {
6     let ac = autocfg::new();
7 
8     // If the "i128" feature is explicity requested, don't bother probing for it.
9     // It will still cause a build error if that was set improperly.
10     if env::var_os("CARGO_FEATURE_I128").is_some() || ac.probe_type("i128") {
11         autocfg::emit("has_i128");
12     }
13 
14     ac.emit_expression_cfg(
15         "unsafe { 1f64.to_int_unchecked::<i32>() }",
16         "has_to_int_unchecked",
17     );
18 
19     autocfg::rerun_path("build.rs");
20 }
21