на самом деле, мне интересны не сами генераторы, а async-await
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: rustc 1.25.0-nightly (a0dcecff9 2018-01-24) running on x86_64-unknown-linux-gnu
note: run with RUST_BACKTRACE=1 for a backtrace
thread 'rustc' panicked at 'called Option::unwrap() on a None value', libcore/option.rs:335:21
note: Some details are omitted, run with RUST_BACKTRACE=full for a verbose backtrace.
stack backtrace:
0: std::sys::unix::backtrace::tracing:👿:unwind_backtrace
at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
1: std::sys_common::backtrace::print
at libstd/sys_common/backtrace.rs:68
at libstd/sys_common/backtrace.rs:57
2: std::panicking::default_hook::{{closure}}
at libstd/panicking.rs:380
3: std::panicking::default_hook
at libstd/panicking.rs:390
4: std::panicking::rust_panic_with_hook
at libstd/panicking.rs:576
5: std::panicking::begin_panic
at libstd/panicking.rs:537
6: std::panicking::begin_panic_fmt
at libstd/panicking.rs:521
7: rust_begin_unwind
at libstd/panicking.rs:497
8: core::panicking::panic_fmt
at libcore/panicking.rs:71
9: core::panicking::panic
at libcore/panicking.rs:51
10: rustc::middle::region::ScopeTree::yield_in_scope_for_expr
11: <rustc_borrowck::borrowck::check_loans::CheckLoanCtxt<'a, 'tcx> as rustc::middle::expr_use_visitor::Delegate<'tcx»::borrow
12: rustc::middle::mem_categorization::MemCategorizationContext::cat_pattern_
13: rustc::middle::mem_categorization::MemCategorizationContext::cat_pattern_
14: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_pat
15: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
16: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
17: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
18: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
19: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
20: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
21: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
22: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
23: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_local
24: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
25: rustc_borrowck::borrowck::check_loans::check_loans
26: rustc_borrowck::borrowck::borrowck
27: rustc::dep_graph::graph::DepGraph::with_task_impl
28: rustc_errors::Handler::track_diagnostics
29: rustc::ty::maps::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx»::cycle_check
30: rustc::ty::maps::<impl rustc::ty::maps::queries::borrowck<'tcx»::force
31: rustc::ty::maps::<impl rustc::ty::maps::queries::borrowck<'tcx»::try_get
32: rustc::ty::maps::TyCtxtAt::borrowck
33: rustc::ty::maps::<impl rustc::ty::context::TyCtxt<'a, 'tcx, 'lcx»::borrowck
34: rustc_borrowck::borrowck::check_crate
35: <std::thread::local::LocalKey<T»::with
36: <std::thread::local::LocalKey<T»::with
37: rustc_driver::driver::compile_input
38: rustc_driver::run_compiler