src/test/run-pass/issue-41696.rs

   1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // this used to cause exponential code-size blowup during LLVM passes.
  12 // min-llvm-version 3.9
  13
  14 #![feature(test)]
  15
  16 extern crate test;
  17
  18 struct MayUnwind;
  19
  20 impl Drop for MayUnwind {
  21     fn drop(&mut self) {
  22         if test::black_box(false) {
  23             panic!()
  24         }
  25     }
  26 }
  27
  28 struct DS<U> {
  29     may_unwind: MayUnwind,
  30     name: String,
  31     next: U,
  32 }
  33
  34 fn add<U>(ds: DS<U>, name: String) -> DS<DS<U>> {
  35     DS {
  36         may_unwind: MayUnwind,
  37         name: "?".to_owned(),
  38         next: ds,
  39     }
  40 }
  41
  42 fn main() {
  43     let deserializers = DS { may_unwind: MayUnwind, name: "?".to_owned(), next: () };
  44     let deserializers = add(deserializers, "?".to_owned());
  45     let deserializers = add(deserializers, "?".to_owned());
  46     let deserializers = add(deserializers, "?".to_owned());
  47     let deserializers = add(deserializers, "?".to_owned());
  48     let deserializers = add(deserializers, "?".to_owned());
  49     let deserializers = add(deserializers, "?".to_owned());
  50     let deserializers = add(deserializers, "?".to_owned()); // 0.7s
  51     let deserializers = add(deserializers, "?".to_owned()); // 1.3s
  52     let deserializers = add(deserializers, "?".to_owned()); // 2.4s
  53     let deserializers = add(deserializers, "?".to_owned()); // 6.7s
  54     let deserializers = add(deserializers, "?".to_owned()); // 26.0s
  55     let deserializers = add(deserializers, "?".to_owned()); // 114.0s
  56     let deserializers = add(deserializers, "?".to_owned()); // 228.0s
  57     let deserializers = add(deserializers, "?".to_owned()); // 400.0s
  58     let deserializers = add(deserializers, "?".to_owned()); // 800.0s
  59     let deserializers = add(deserializers, "?".to_owned()); // 1600.0s
  60     let deserializers = add(deserializers, "?".to_owned()); // 3200.0s
  61 }