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bombless opened this issue Apr 19, 2015 · 8 comments
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rustc takes too much time to evaluate a struct type with recursion using Rc #24600

bombless opened this issue Apr 19, 2015 · 8 comments
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I-slow Issue: Problems and improvements with respect to performance of generated code.

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@bombless
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Check my code here to reproduce:
bombless/bfvm-rs@ff03a10
(see that sexp crate)

$ rustc -Vv
rustc 1.0.0-dev (bd6c30e02 2015-04-18) (built 2015-04-18)
binary: rustc
commit-hash: bd6c30e0235f1903c12321be173d1c26e4e6e3ed
commit-date: 2015-04-18
build-date: 2015-04-18
host: x86_64-pc-windows-gnu
release: 1.0.0-dev

here's "-Z time-passes" output:

time: 0.003     parsing
time: 0.000     recursion limit
time: 0.000     configuration 1
time: 0.000     gated macro checking
time: 0.000     crate injection
time: 0.026     macro loading
time: 0.000     plugin loading
time: 0.000     plugin registration
time: 0.022     expansion
time: 0.000     complete gated feature checking 1
time: 0.001     configuration 2
time: 0.001     maybe building test harness
time: 0.000     prelude injection
time: 0.000     checking that all macro invocations are gone
time: 0.000     complete gated feature checking 2
time: 0.000     assigning node ids and indexing ast
time: 0.000     external crate/lib resolution
time: 0.000     language item collection
time: 0.014     resolution
time: 0.000     lifetime resolution
time: 0.000     looking for entry point
time: 0.000     looking for plugin registrar
time: 0.000     region resolution
time: 0.000     loop checking
time: 0.000     static item recursion checking
time: 0.000     type collecting
time: 0.000     variance inference
time: 0.750     coherence checking
time: 0.472     type checking
time: 0.080     const checking
time: 0.000     privacy checking
time: 0.000     stability index
time: 0.000     intrinsic checking
time: 0.000     effect checking
time: 0.012     match checking
time: 0.000     liveness checking
time: 0.049     borrow checking
time: 0.040     rvalue checking
time: 0.000     reachability checking
time: 0.000     death checking
time: 0.043     stability checking
time: 0.000     unused lib feature checking
sexp/lib.rs:121:1: 123:2 warning: function is never used: `main`, #[warn(dead_code)] on by default
sexp/lib.rs:121 fn main() {
sexp/lib.rs:122     parse_sexp(&mut b"()".iter().cloned().peekable()).unwrap();
sexp/lib.rs:123 }
time: 0.048     lint checking
time: 0.000     resolving dependency formats

FWIW, 2 weeks ago rustc reported "overflow evaluating the requirement _ : core::marker::Sized" in a minute instead of hanging for this code.

@tomaka may have other ways to reproduce this.
@bombless bombless changed the title rustc hangs on "resolving dependency formats" rustc hangs after "resolving dependency formats" Apr 19, 2015
@bombless
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Oh after Ctrl+D to kill the process, the terminal prints "error: overflow evaluating the requirement _ : core::marker::Sized [E0275]" now, but still hang after printing "error: aborting due to previous error"

@nagisa
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nagisa commented Apr 19, 2015

NB: after “resolving dependency formats” comes “translation”.

@tomaka tomaka mentioned this issue Apr 19, 2015
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@nagisa
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nagisa commented Apr 19, 2015

Got

sexp/lib.rs:1:1: 1:1 error: overflow evaluating the requirement `_ : core::marker::Sized` [E0275]
sexp/lib.rs:1 use std::iter::Peekable;

after a few minutes of trans (and an exhausted randomness pool).

(1284be4 2015-04-18 on linux)

@bombless
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beta.2 took several minutes but doesn't hang.

time: 0.001     parsing
time: 0.000     recursion limit
time: 0.000     configuration 1
time: 0.000     gated macro checking
time: 0.000     crate injection
time: 0.009     macro loading
time: 0.000     plugin loading
time: 0.000     plugin registration
time: 0.004     expansion
time: 0.000     complete gated feature checking 1
time: 0.000     configuration 2
time: 0.000     maybe building test harness
time: 0.000     prelude injection
time: 0.000     checking that all macro invocations are gone
time: 0.000     complete gated feature checking 2
time: 0.000     assigning node ids and indexing ast
time: 0.000     external crate/lib resolution
time: 0.000     language item collection
time: 0.006     resolution
time: 0.000     lifetime resolution
time: 0.000     looking for entry point
time: 0.000     looking for plugin registrar
time: 0.000     region resolution
time: 0.000     loop checking
time: 0.000     static item recursion checking
time: 0.000     type collecting
time: 0.000     variance inference
time: 0.214     coherence checking
time: 0.105     type checking
time: 0.023     const checking
time: 0.000     privacy checking
time: 0.000     stability index
time: 0.000     intrinsic checking
time: 0.000     effect checking
time: 0.001     match checking
time: 0.000     liveness checking
time: 0.011     borrow checking
time: 0.008     rvalue checking
time: 0.000     reachability checking
time: 0.000     death checking
time: 0.011     stability checking
time: 0.000     unused lib feature checking
lib.rs:121:1: 123:2 warning: function is never used: `main`, #[warn(dead_code)] on by default
lib.rs:121 fn main() {
lib.rs:122     parse_sexp(&mut b"()".iter().cloned().peekable()).unwrap();
lib.rs:123 }
time: 0.014     lint checking
time: 0.000     resolving dependency formats
lib.rs:1:1: 1:1 error: overflow evaluating the requirement `_ : core::marker::Sized` [E0275]
lib.rs:1 use std::iter::Peekable;
         ^
lib.rs:1:1: 1:1 note: consider adding a `#![recursion_limit="128"]` attribute to your crate
lib.rs:1 use std::iter::Peekable;
         ^
error: aborting due to previous error

with

real    2m23.430s
user    0m0.000s
sys     0m0.030s

Maybe it's because my ./configure --enable-debug --enable-optimize, and per #24601 it's probably a Windows-only thing (I'd admit it's likely that these are 2 different things).

I'm using Windows 8.1 64 bit.

@bombless
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I tested rustc 1.0.0-nightly (00978a987 2015-04-18) (built 2015-04-19) resulted in

real    2m41.611s
user    0m0.000s
sys     0m0.030s

(it seems that "-Z time-passes" is not useful in this case)

@bombless
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Okay my local rustc take 10 minutes to compile now.

real    9m5.706s
user    0m0.000s
sys     0m0.015s

The thing is, last time I tried I was using a rustc without --enable-optimize (see #24405), so rustc didn't make it to compile within 1 hour.

edit: fixed a miss-copy&paste

@bombless bombless changed the title rustc hangs after "resolving dependency formats" rustc takes to much time to evaluate a struct type with recursion using Rc Apr 19, 2015
@bombless
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FWIW: removing the main() makes the error go away.

@bombless bombless changed the title rustc takes to much time to evaluate a struct type with recursion using Rc rustc takes too much time to evaluate a struct type with recursion using Rc Apr 20, 2015
@steveklabnik steveklabnik added the I-slow Issue: Problems and improvements with respect to performance of generated code. label Apr 20, 2015
@steveklabnik
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Triage: today, that commit fails to compile with a... hilarious error message:

[steve@becoming bfvm-rs ((ff03a10...))]$ rustup run nightly cargo build
   Compiling bencode v0.0.1 (file:///home/steve/tmp/bfvm-rs/bencode)
   Compiling sexp v0.0.1 (file:///home/steve/tmp/bfvm-rs/sexp)
   Compiling bf v0.0.1 (file:///home/steve/tmp/bfvm-rs/bf)
bencode/lib.rs:77:14: 77:24 warning: unnecessary parentheses around `for` head expression, #[warn(unused_parens)] on by default
bencode/lib.rs:77     for _ in (0 .. len) {
                               ^~~~~~~~~~
sexp/lib.rs:121:1: 123:2 warning: function is never used: `main`, #[warn(dead_code)] on by default
sexp/lib.rs:121 fn main() {
                ^
error: overflow evaluating the requirement `<std::slice::Iter<u8> as std::iter::Iterator>::Item` [E0275]
note: consider adding a `#![recursion_limit="128"]` attribute to your crate
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Cloned<std::slice::Iter<u8>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
note: required because of the requirements on the impl of `std::iter::Iterator` for `std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Chain<std::option::IntoIter<u8>, &mut std::iter::Peekable<std::iter::Cloned<std::slice::Iter<u8>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
error: aborting due to previous error
Build failed, waiting for other jobs to finish...
error: Could not compile `sexp`.

but it does so instantaneously. Considering this closed.

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I-slow Issue: Problems and improvements with respect to performance of generated code.
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@steveklabnik @nagisa @bombless