rustc 1.17.0-nightly (6f10e2f63 2017-03-14)

INFO:rustc_metadata::creader: resolving crate `extern crate rayon as rayon`
error: internal compiler error: unexpected panic

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

note: run with `RUST_BACKTRACE=1` for a backtrace

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', /checkout/src/libcore/option.rs:323
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: rustc_metadata::creader::CrateLoader::resolve_crate
   1: <rustc_metadata::creader::CrateLoader<'a> as rustc::middle::cstore::CrateLoader>::process_item
   2: rustc_resolve::build_reduced_graph::<impl rustc_resolve::Resolver<'a>>::build_reduced_graph_for_item
   3: <rustc_resolve::build_reduced_graph::BuildReducedGraphVisitor<'a, 'b> as syntax::visit::Visitor<'a>>::visit_item
   4: <rustc_resolve::build_reduced_graph::BuildReducedGraphVisitor<'a, 'b> as syntax::visit::Visitor<'a>>::visit_item
   5: rustc_resolve::macros::<impl syntax::ext::base::Resolver for rustc_resolve::Resolver<'a>>::visit_expansion
   6: syntax::ext::expand::MacroExpander::collect_invocations
   7: syntax::ext::expand::MacroExpander::expand
   8: syntax::ext::expand::MacroExpander::expand_crate
   9: rustc_driver::driver::phase_2_configure_and_expand::{{closure}}
  10: rustc_driver::driver::phase_2_configure_and_expand
  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

error: Could not compile `img-dup`.

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