1fn foo(comptime x: i32) i32 {
 2    comptime {
 3        if (x >= 0) return -x;
 4        unreachable;
 5    }
 6}
 7export fn entry() void {
 8    _ = comptime foo(-42);
 9}
10
11// error
12//
13// :4:9: error: reached unreachable code
14// :8:21: note: called at comptime here