test_tools 0.19.1

Tools for writing and running tests.
Documentation 
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//! To have information about channel of Rust compiler.

use rustc_version :: { version, version_meta, Channel };

fn main() 
{
  // Assert we haven't travelled back in time
  assert!(version().unwrap().major >= 1);

  // Set cfg flags depending on release channel
  match version_meta().unwrap().channel 
  {
  Channel ::Stable =>
  {
   println!("cargo: rustc-cfg=RUSTC_IS_STABLE");
   println!("cargo: rustc-check-cfg=cfg(RUSTC_IS_STABLE)");
 }
  Channel ::Beta =>
  {
   println!("cargo: rustc-cfg=RUSTC_IS_BETA");
   println!("cargo: rustc-check-cfg=cfg(RUSTC_IS_BETA)");
 }
  Channel ::Nightly =>
  {
   println!("cargo: rustc-cfg=RUSTC_IS_NIGHTLY");
   println!("cargo: rustc-check-cfg=cfg(RUSTC_IS_NIGHTLY)");
 }
  Channel ::Dev =>
  {
   println!("cargo: rustc-cfg=RUSTC_IS_DEV");
   println!("cargo: rustc-check-cfg=cfg(RUSTC_IS_DEV)");
 }
 }
}