Closed
Description
The following code:
use std::slice::Chunks;
use std::slice::MutChunks;
fn dft_iter<'a, T>(arg1: Chunks<'a,T>, arg2: MutChunks<'a,T>)
{
for &something in arg2
{
}
}gives the following compiler error (when run with RUST_BACKTRACE=1):
➤ env RUST_BACKTRACE=1 rustc error.rs --test
error.rs:6:9: 6:19 error: internal compiler error: Explicit deref of non-derefable type: &mut [T]
error.rs:6 for &something in arg2
^~~~~~~~~~
note: the compiler hit an unexpected failure path. 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' failed at 'Box<Any>', /home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/libsyntax/diagnostic.rs:115
stack backtrace:
1: 0x7f0ceac27620 - rt::backtrace::imp::write::h0fea79425673725266p
2: 0x7f0ceac2ae80 - failure::on_fail::h9aabe19bffc3104alsq
3: 0x7f0ceb3feff0 - unwind::begin_unwind_inner::h9b55d31cfec63a9e40d
4: 0x7f0ce98a5a90 - unwind::begin_unwind::h1183448402907672069
5: 0x7f0ce98a59c0 - diagnostic::SpanHandler::span_bug::h5b8de884ef10a1cbUdy
6: 0x7f0ceb8669c0 - driver::session::Session::span_bug::hf691bf888bfdb422Znt
7: 0x7f0cebae8730 - middle::mem_categorization::MemCategorizationContext<'t, TYPER>::cat_deref::h4514730681874017381
8: 0x7f0cebae6e30 - middle::mem_categorization::MemCategorizationContext<'t, TYPER>::cat_pattern::h12152313789936254827
9: 0x7f0cebacd160 - middle::typeck::check::regionck::visit_local::h763740eedaeb1379i4b
10: 0x7f0cebacd3d0 - visit::walk_block::h12723599008176341713
11: 0x7f0cebac9050 - middle::typeck::check::regionck::visit_expr::h73423e7aa5968300D7b
12: 0x7f0cebad0470 - visit::walk_expr::h17493730021457087419
13: 0x7f0cebac9050 - middle::typeck::check::regionck::visit_expr::h73423e7aa5968300D7b
14: 0x7f0cebacd3d0 - visit::walk_block::h12723599008176341713
15: 0x7f0cebac9050 - middle::typeck::check::regionck::visit_expr::h73423e7aa5968300D7b
16: 0x7f0cebad0470 - visit::walk_expr::h17493730021457087419
17: 0x7f0cebac9050 - middle::typeck::check::regionck::visit_expr::h73423e7aa5968300D7b
18: 0x7f0cebacd3d0 - visit::walk_block::h12723599008176341713
19: 0x7f0cebb11e00 - middle::typeck::check::check_bare_fn::haf584d83c0be5c3bwBg
20: 0x7f0cebb0ae60 - middle::typeck::check::check_item::h08679946a56c7e5fcah
21: 0x7f0cebb11c00 - middle::typeck::check::check_item_types::hfa0d60d09ac306bcOAg
22: 0x7f0cebc83a50 - middle::typeck::check_crate::h59523a23ed9761e6GhH
23: 0x7f0cec00cd20 - driver::driver::phase_3_run_analysis_passes::h47669ed167b54bdezhs
24: 0x7f0cec0085c0 - driver::driver::compile_input::h539bec547706263dA3r
25: 0x7f0cec0c1050 - driver::run_compiler::h9cb91406a88d027059u
26: 0x7f0cec0c0f60 - driver::main_args::closure.$x22closure$x22$LP$133605$RP$
27: 0x7f0cec0d4ab0 - task::TaskBuilder<S>::try_future::closure.$x22closure$x22$LP$134754$RP$
28: 0x7f0cec0d4840 - task::TaskBuilder<S>::spawn_internal::closure.$x22closure$x22$LP$134731$RP$
29: 0x7f0ceca78df0 - task::spawn_opts::closure.$x22closure$x22$LP$8163$RP$
30: 0x7f0ceb4567b0 - rust_try
31: 0x7f0ceb3fc080 - unwind::try::hc59e8203d98cfea8tPd
32: 0x7f0ceb3fbde0 - task::Task::run::hc5aad491de06c5bcP0c
33: 0x7f0ceca78be0 - task::spawn_opts::closure.$x22closure$x22$LP$8109$RP$
34: 0x7f0ceb3fe060 - thread::thread_start::h597549996b7dcb76nnd
35: 0x7f0cea6a8e70 - start_thread
36: 0x7f0ceb0c0db9 - clone
37: 0x0 - <unknown>
rustc -v gives:
rustc 0.12.0-pre-nightly (afbcbbc77ffc6b10053bc543daf7d2e05d68cc01 2014-07-16 00:31:15 +0000)
I'm running this on Fedora 20, x86_64