thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:355:21
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
   1: std::sys_common::backtrace::_print
   2: std::panicking::default_hook::{{closure}}
   3: std::panicking::default_hook
   4: std::panicking::rust_panic_with_hook
   5: std::panicking::continue_panic_fmt
   6: rust_begin_unwind
   7: core::panicking::panic_fmt
   8: core::panicking::panic
   9: <core::option::Option<T>>::unwrap
             at /usr/src/rust/src/libcore/macros.rs:20
  10: bootstrap::compile::copy_third_party_objects
             at src/bootstrap/compile.rs:126
  11: <bootstrap::compile::Std as bootstrap::builder::Step>::run
             at src/bootstrap/compile.rs:92
  12: bootstrap::builder::Builder::ensure
             at src/bootstrap/builder.rs:1227
  13: <bootstrap::compile::Test as bootstrap::builder::Step>::run
             at src/bootstrap/compile.rs:351
  14: bootstrap::builder::Builder::ensure
             at src/bootstrap/builder.rs:1227
  15: <bootstrap::compile::Rustc as bootstrap::builder::Step>::run
             at src/bootstrap/compile.rs:472
  16: bootstrap::builder::Builder::ensure
             at src/bootstrap/builder.rs:1227
  17: <bootstrap::compile::Assemble as bootstrap::builder::Step>::run
             at src/bootstrap/compile.rs:956
  18: bootstrap::builder::Builder::ensure
             at src/bootstrap/builder.rs:1227
  19: bootstrap::builder::Builder::compiler
             at src/bootstrap/builder.rs:571
  20: <bootstrap::compile::Assemble as bootstrap::builder::Step>::run
             at src/bootstrap/compile.rs:949
  21: bootstrap::builder::Builder::ensure
             at src/bootstrap/builder.rs:1227
  22: bootstrap::builder::Builder::compiler
             at src/bootstrap/builder.rs:571
  23: <bootstrap::dist::Rustc as bootstrap::builder::Step>::make_run
             at src/bootstrap/dist.rs:401
  24: bootstrap::builder::StepDescription::maybe_run
             at src/bootstrap/builder.rs:181
  25: bootstrap::builder::StepDescription::run
             at src/bootstrap/builder.rs:205
  26: bootstrap::builder::Builder::run_step_descriptions
             at src/bootstrap/builder.rs:563
  27: bootstrap::builder::Builder::execute_cli
             at src/bootstrap/builder.rs:553
  28: bootstrap::Build::build
             at src/bootstrap/lib.rs:460
  29: bootstrap::main
             at src/bootstrap/bin/main.rs:17
  30: std::rt::lang_start::{{closure}}
             at /usr/src/rust/src/libstd/rt.rs:74
  31: std::panicking::try::do_call
  32: __rust_maybe_catch_panic
  33: std::rt::lang_start_internal
  34: std::rt::lang_start
             at /usr/src/rust/src/libstd/rt.rs:74
  35: main
  36: <unknown>
failed to run: /var/cache/sources/rustc-1.34.0-src/build/bootstrap/debug/bootstrap dist -j9
Build completed unsuccessfully in 0:00:01