assertion failed: self.is_collecting_in_band_lifetimes @rustc 1.30.0-nightly

[shekohex]

i think it's about hidden lifetime parameters
i'm Trying Rust 2018 edition
I tried this code:

use std::collections::hash_map::Keys;
// ArcVec and  ArcHashMap is just a type alias
#[derive(Clone)]
pub struct FilesGuardService<'_> {
    paths: ArcVec<Keys<'_, String, String>>,
    hashes: ArcHashMap<String, String>,
}

I expected to see this happen: to work as expected
but when i change the lifetime to something like a it works

#[derive(Clone)]
pub struct FilesGuardService<'a> {
    paths: ArcVec<Keys<'a, String, String>>,
    hashes: ArcHashMap<String, String>,
}

Meta

rustc 1.30.0-nightly (7e8ca9f8b 2018-08-03)
binary: rustc
commit-hash: 7e8ca9f8bd8325398e76bc30ac09aab138bbb127
commit-date: 2018-08-03
host: x86_64-unknown-linux-gnu
release: 1.30.0-nightly
LLVM version: 7.0

Backtrace:

thread 'main' panicked at 'assertion failed: self.is_collecting_in_band_lifetimes', librustc/hir/lowering.rs:738:9
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::print
             at libstd/sys_common/backtrace.rs:71
             at libstd/sys_common/backtrace.rs:59
   2: std::panicking::default_hook::{{closure}}
             at libstd/panicking.rs:211
   3: std::panicking::default_hook
             at libstd/panicking.rs:227
   4: rustc::util::common::panic_hook
   5: std::panicking::rust_panic_with_hook
             at libstd/panicking.rs:479
   6: std::panicking::begin_panic
   7: rustc::hir::lowering::LoweringContext::lower_lifetime
   8: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &'a mut F>::call_once
   9: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter
  10: rustc::hir::lowering::LoweringContext::lower_generics
  11: rustc::hir::lowering::LoweringContext::lower_item
  12: <rustc::hir::lowering::LoweringContext::lower_crate::ItemLowerer<'lcx, 'interner> as syntax::visit::Visitor<'lcx>>::visit_item
  13: syntax::visit::walk_item
  14: <rustc::hir::lowering::LoweringContext::lower_crate::ItemLowerer<'lcx, 'interner> as syntax::visit::Visitor<'lcx>>::visit_item
  15: rustc::hir::lowering::lower_crate
  16: rustc::util::common::time
  17: rustc_driver::driver::phase_2_configure_and_expand
  18: rustc_driver::driver::compile_input
  19: rustc_driver::run_compiler_with_pool
  20: <scoped_tls::ScopedKey<T>>::set
  21: syntax::with_globals
  22: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
  23: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:105
  24: rustc_driver::run
  25: rustc_driver::main
  26: std::rt::lang_start::{{closure}}
  27: std::panicking::try::do_call
             at libstd/rt.rs:59
             at libstd/panicking.rs:310
  28: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:105
  29: std::rt::lang_start_internal
             at libstd/panicking.rs:289
             at libstd/panic.rs:392
             at libstd/rt.rs:58
  30: main
  31: __libc_start_main
  32: <unknown>
query stack during panic:
end of query stack

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 1.30.0-nightly (7e8ca9f8b 2018-08-03) running on x86_64-unknown-linux-gnu

note: compiler flags: -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

error: Could not compile `cogg`.

Caused by:
  process didn't exit successfully: `rustc --edition=2018 --crate-name ggserver cogg/src/server/server.rs --crate-type bin --emit=dep-info,link -C debuginfo=2 -C metadata=caeed36abb997343 -C extra-filename=-caeed36abb997343 --out-dir /media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps -C incremental=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/incremental -L dependency=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps --extern bytes=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libbytes-127f57330cb2614c.rlib --extern protos=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libprotos-bbb805d07b1a101f.rlib --extern colored=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libcolored-97d2353e03f88efb.rlib --extern env_logger=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libenv_logger-c0253d7427ca4932.rlib --extern failure=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libfailure-8592148b33408ae9.rlib --extern failure_derive=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libfailure_derive-909ddbb056987232.so --extern fshash=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libfshash-ced94d73025e0a6f.rlib --extern futures=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libfutures-1cb57ddc4c559aad.rlib --extern grpcio=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libgrpcio-9ddda0c389d213c3.rlib --extern json=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libjson-98d840291e574801.rlib --extern log=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/liblog-ec46a7791176dd89.rlib --extern protobuf=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libprotobuf-6ef6353455652a35.rlib --extern serde=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libserde-9e89b185086676fd.rlib --extern serde_derive=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libserde_derive-51c52f82833ed074.so --extern serde_json=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libserde_json-898f0371196fa840.rlib --extern toml=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/deps/libtoml-69159f051b4339b9.rlib -L native=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/build/backtrace-sys-cce50b7c759d4874/out -L native=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/build/rust-crypto-09458b19c722df58/out -L native=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/build/grpcio-sys-e79c618176a27279/out/build -L native=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/build/grpcio-sys-e79c618176a27279/out/build/third_party/cares/cares/lib -L native=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/build/grpcio-sys-e79c618176a27279/out/build/third_party/zlib -L native=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/build/grpcio-sys-e79c618176a27279/out/build/third_party/boringssl/ssl -L native=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/build/grpcio-sys-e79c618176a27279/out/build/third_party/boringssl/crypto -L native=/media/shadykhalifa/pc/Projects/cogg-project/target/debug/build/grpcio-sys-e79c618176a27279/out` (exit code: 101)

[shekohex]

Deplucated #52098
Closing