bump required rustc version
@@ -4,7 +4,7 @@ use std::process::Command;
fn check_rust_version() {
let rust_version = version().expect("Could not get rustc version");
let expected_major_version = 1;
- let expected_minor_version = 39;
+ let expected_minor_version = 40;
assert_eq!(rust_version.major, expected_major_version);
