Compiling playground v0.0.1 (/playground) error[E0603]: module `thread_info` is private --> src/lib.rs:2:31 | 2 | let thread = std::thread::thread_info::current_thread(); | ^^^^^^^^^^^ error: internal compiler error: src/librustc/middle/stability.rs:768: encountered unmarked API: DefId(1/0:4216 ~ std[508b]::sys_common[0]::thread_info[0]::current_thread[0]) --> src/lib.rs:2:18 | 2 | let thread = std::thread::thread_info::current_thread(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:543:9 note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. stack backtrace: 0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:39 1: std::sys_common::backtrace::_print at src/libstd/sys_common/backtrace.rs:70 2: std::panicking::default_hook::{{closure}} at src/libstd/sys_common/backtrace.rs:58 at src/libstd/panicking.rs:200 3: std::panicking::default_hook at src/libstd/panicking.rs:215 4: rustc::util::common::panic_hook 5: std::panicking::rust_panic_with_hook at src/libstd/panicking.rs:482 6: std::panicking::begin_panic 7: rustc_errors::Handler::span_bug 8: rustc::util::bug::opt_span_bug_fmt::{{closure}} 9: rustc::ty::context::tls::with_opt::{{closure}} 10: rustc::ty::context::tls::with_context_opt 11: rustc::ty::context::tls::with_opt 12: rustc::util::bug::opt_span_bug_fmt 13: rustc::util::bug::span_bug_fmt 14: rustc::middle::stability::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::check_stability 15: <rustc::middle::stability::Checker<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_path 16: rustc::hir::intravisit::walk_expr 17: rustc::hir::intravisit::walk_local 18: rustc::hir::intravisit::walk_expr 19: rustc::hir::intravisit::Visitor::visit_fn 20: rustc::hir::intravisit::walk_item 21: <rustc::middle::stability::Checker<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_item 22: rustc::hir::map::Map::visit_item_likes_in_module 23: rustc::middle::stability::check_mod_unstable_api_usage 24: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::check_mod_unstable_api_usage<'tcx>>::compute 25: rustc::dep_graph::graph::DepGraph::with_task_impl 26: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_get_with 27: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::ensure_query 28: rustc::middle::stability::check_unstable_api_usage 29: rustc::util::common::time 30: <std::thread::local::LocalKey<T>>::with 31: rustc::ty::context::TyCtxt::create_and_enter 32: rustc_driver::driver::compile_input 33: rustc_driver::run_compiler_with_pool 34: <scoped_tls::ScopedKey<T>>::set 35: rustc_driver::run_compiler 36: <scoped_tls::ScopedKey<T>>::set query stack during panic: #0 [check_mod_unstable_api_usage] checking for unstable API usage in top-level module end of query stack error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0603`. 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 1.34.0-nightly (8a57831a4 2019-02-02) running on x86_64-unknown-linux-gnu note: compiler flags: -C codegen-units=1 -C debuginfo=2 --crate-type lib note: some of the compiler flags provided by cargo are hidden error: Could not compile `playground`. To learn more, run the command again with --verbose.