issue-41696.rs

// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// this used to cause exponential code-size blowup during LLVM passes.
// ignore-test FIXME #41696
// min-llvm-version 3.9

#![feature(test)]

extern crate test;

struct MayUnwind;

impl Drop for MayUnwind {
    fn drop(&mut self) {
        if test::black_box(false) {
            panic!()
        }
    }
}

struct DS<U> {
    may_unwind: MayUnwind,
    name: String,
    next: U,
}

fn add<U>(ds: DS<U>, name: String) -> DS<DS<U>> {
    DS {
        may_unwind: MayUnwind,
        name: "?".to_owned(),
        next: ds,
    }
}

fn main() {
    let deserializers = DS { may_unwind: MayUnwind, name: "?".to_owned(), next: () };
    let deserializers = add(deserializers, "?".to_owned());
    let deserializers = add(deserializers, "?".to_owned());
    let deserializers = add(deserializers, "?".to_owned());
    let deserializers = add(deserializers, "?".to_owned());
    let deserializers = add(deserializers, "?".to_owned());
    let deserializers = add(deserializers, "?".to_owned());
    let deserializers = add(deserializers, "?".to_owned()); // 0.7s
    let deserializers = add(deserializers, "?".to_owned()); // 1.3s
    let deserializers = add(deserializers, "?".to_owned()); // 2.4s
    let deserializers = add(deserializers, "?".to_owned()); // 6.7s
    let deserializers = add(deserializers, "?".to_owned()); // 26.0s
    let deserializers = add(deserializers, "?".to_owned()); // 114.0s
    let deserializers = add(deserializers, "?".to_owned()); // 228.0s
    let deserializers = add(deserializers, "?".to_owned()); // 400.0s
    let deserializers = add(deserializers, "?".to_owned()); // 800.0s
    let deserializers = add(deserializers, "?".to_owned()); // 1600.0s
    let deserializers = add(deserializers, "?".to_owned()); // 3200.0s
}