[package] name = "rust-1-18-bug" version = "0.1.0" authors = ["philipp <philipp>"] [dependencies] itertools="0" 

extern crate itertools; use itertools::Itertools; fn main() { [0].iter() .map(|n| (n, 0)) .group_by(|_| 0) .into_iter() .map(|(_, grp)| grp.into_iter() .group_by(|_| 0) .into_iter() .map(|(_, grpinner)| grpinner.into_iter()) ); } 

error: internal compiler error: unresolved type in dtorck --> src/main.rs:13:38 | 13 | .map(|(_, grpinner)| grpinner.into_iter()) | ^^^^^^^^^^^^^^^^^^^^ note: the compiler unexpectedly panicked. this is a bug. note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports thread 'rustc' panicked at 'Box<Any>', /checkout/src/librustc_errors/lib.rs:375 note: Run with `RUST_BACKTRACE=1` for a backtrace. 

rustc 1.18.0 (03fc9d622 2017-06-06) binary: rustc commit-hash: 03fc9d622e0ea26a3d37f5ab030737fcca6928b9 commit-date: 2017-06-06 host: x86_64-unknown-linux-gnu release: 1.18.0 LLVM version: 3.9 

thread 'rustc' panicked at 'Box<Any>', /checkout/src/librustc_errors/lib.rs:375 stack backtrace: 0: std::sys::imp::backtrace::tracing::imp::unwind_backtrace at /checkout/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:49 1: std::sys_common::backtrace::_print at /checkout/src/libstd/sys_common/backtrace.rs:71 2: std::panicking::default_hook::{{closure}} at /checkout/src/libstd/sys_common/backtrace.rs:60 at /checkout/src/libstd/panicking.rs:355 3: std::panicking::default_hook at /checkout/src/libstd/panicking.rs:365 4: std::panicking::rust_panic_with_hook at /checkout/src/libstd/panicking.rs:549 5: std::panicking::begin_panic 6: rustc_errors::Handler::abort_if_errors 7: rustc_passes::consts::check_crate 8: rustc_driver::driver::phase_3_run_analysis_passes::{{closure}} 9: rustc::ty::context::TyCtxt::create_and_enter 10: rustc_driver::driver::phase_3_run_analysis_passes 11: rustc_driver::driver::compile_input 12: rustc_driver::run_compiler 13: std::panicking::try::do_call 14: __rust_maybe_catch_panic at /checkout/src/libpanic_unwind/lib.rs:98 15: <F as alloc::boxed::FnBox<A>>::call_box 16: std::sys::imp::thread::Thread::new::thread_start at /checkout/src/liballoc/boxed.rs:650 at /checkout/src/libstd/sys_common/thread.rs:21 at /checkout/src/libstd/sys/unix/thread.rs:84 17: start_thread 18: clone