assertion failed: end <= self.len(), slice.rs:432

[graue]

Got this compiler panic on some (probably badly-typed or otherwise bogus) code while I was playing around with Iron.

$ RUST_BACKTRACE=1 cargo run
   Compiling respin v0.0.1 (file:///home/sf/code/respin)
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' panicked at 'assertion failed: end <= self.len()', /build/buildd/rust-nightly-201412110407~c38e73f~trusty/src/libcore/slice.rs:432

stack backtrace:
   1:     0x7f28ee9444a0 - rt::backtrace::imp::write::h55de1d8099e4900eGOx
   2:     0x7f28ee9476e0 - <unknown>
   3:     0x7f28ee598730 - unwind::begin_unwind_inner::h883d9d0bc1a42020CJc
   4:     0x7f28ee598230 - unwind::begin_unwind_fmt::h8f8e4ba4676dfd67ZGc
   5:     0x7f28ee5981f0 - rust_begin_unwind
   6:     0x7f28ee5e0d00 - panicking::panic_fmt::h1f5e8516e9378c44Rtl
   7:     0x7f28ee5dea00 - panicking::panic::h32a2f1670d6e76bbhrl
   8:     0x7f28ece75810 - <unknown>
   9:     0x7f28ece6e480 - <unknown>
  10:     0x7f28ece69c80 - metadata::loader::Context<'a>::load_library_crate::h7d265ef09dd588e4Rew
  11:     0x7f28ece64a00 - <unknown>
  12:     0x7f28ece5ef90 - metadata::creader::Env<'a>.visit..Visitor<'v>::visit_view_item::h62ac4fa3f4f6b218pzu
  13:     0x7f28ece5e3b0 - metadata::creader::read_crates::hf06f8f790089383djyu
  14:     0x7f28eedb47c0 - <unknown>
  15:     0x7f28eed75180 - driver::phase_3_run_analysis_passes::hf054103c6dc131a2Cta
  16:     0x7f28eed63f10 - driver::compile_input::h88782f52f60d8ddfpba
  17:     0x7f28eee00b70 - <unknown>
  18:     0x7f28eee00a60 - <unknown>
  19:     0x7f28eee12440 - <unknown>
  20:     0x7f28ee91c920 - <unknown>
  21:     0x7f28ee5963d0 - <unknown>
  22:     0x7f28ee5f3b20 - <unknown>
  23:     0x7f28ee5f3b10 - rust_try
  24:     0x7f28ee5964b0 - unwind::try::h11e0e7a86a15bb76Tyc
  25:     0x7f28ee596270 - task::Task::run::ha12fe9def6cd7cccfKb
  26:     0x7f28ee595e60 - <unknown>
  27:     0x7f28ee5978b0 - <unknown>
  28:     0x7f28e95c20c0 - start_thread
  29:     0x7f28ee25bec9 - __clone
  30:                0x0 - <unknown>

Could not compile `respin`.

To learn more, run the command again with --verbose.

$ rustc --version=verbose
rustc 0.13.0-dev
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-unknown-linux-gnu
release: 0.13.0-dev

(on Ubuntu 14.04.1, if that makes a difference)

The code (main.rs), depending on iron 0.0.7:

#![feature(globs)]

extern crate iron;

use iron::prelude::*;
use iron::status;
use iron::response::modifiers::{Status, Body};
use iron::lib::Router;
use iron::method::Method::Get;

fn main() {
    fn hello_world(_: &mut Request) -> IronResult<Response> {
        Ok(Response::new()
            .set(Status(status::Ok))
            .set(Body("Hello, respinners!"))
        )
    }

    fn hello_name(req: &mut Request) -> IronResult<Response> {
        let name = "foobar";
        Ok(Response::new()
            .set(Status(status::Ok))
            .set(Body(format!("Hello, {}!", name))))
    }

    let handler = Router::new()
        .route(Get, "/", hello_world)
        .route(Get, "/hello/to/:name", hello_name);

    Iron::new(handler).listen("localhost:3000").unwrap();
    println!("Running on http://localhost:3000");
}

Full command-line (from rerunning cargo with --verbose):

rustc /home/sf/code/respin/src/main.rs --crate-name respin --crate-type bin -g --out-dir /home/sf/code/respin/target --dep-info /home/sf/code/respin/target/.fingerprint/respin-a6dd2b0ba6279ec4/dep-bin-respin -L /home/sf/code/respin/target -L /home/sf/code/respin/target/deps --extern iron=/home/sf/code/respin/target/deps/libiron-e87c72731129dad5.rlib --extern sqlite3=/home/sf/code/respin/target/deps/libsqlite3-6fbe643ffe0fcd2b.rlib -L /usr/lib/x86_64-linux-gnu -L /home/sf/code/respin/target/build/time-e4630d556186c523/out

[nikomatsakis]

This is due to a recent change, make clean should fix it.