#[attr = MacroUse {arguments: UseAll}]
extern crate std;
#[prelude_import]
use ::std::prelude::rust_2015::*;
//@ compile-flags: -Zunpretty=hir
//@ check-pass
//@ edition: 2015



fn foo(x:
        Option<u32>) {
    let Some(_) = x else
        {

        { ::std::rt::begin_panic("explicit panic") }
    };
}
fn main() { }