error

cfg: version 1.12.0-dev (8eb7e6a0f 2016-07-28)
cfg: build triple x86_64-apple-darwin
cfg: host triples x86_64-apple-darwin
cfg: target triples x86_64-apple-darwin
cfg: enabling debug assertions (CFG_ENABLE_DEBUG_ASSERTIONS)
cfg: enabling debuginfo (CFG_ENABLE_DEBUGINFO)
cfg: host for x86_64-apple-darwin is x86_64
cfg: os for x86_64-apple-darwin is apple-darwin
cfg: have good valgrind for x86_64-apple-darwin
cfg: using CC=ccache clang (CFG_CC)
cfg: using CXX=clang++ (CFG_CXX)
cfg: disabling valgrind run-pass tests
rustc: x86_64-apple-darwin/stage1/lib/rustlib/x86_64-apple-darwin/lib/libterm
error: can't find crate for `std` [E0463]
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 'encountered error with `-Z treat_err_as_bug', src/librustc_errors/lib.rs:544
stack backtrace:
   1:        0x1112bfd75 - std::sys::backtrace::tracing::imp::write::hf504bc08f2a3011f
   2:        0x1112ce78a - std::panicking::default_hook::_{{closure}}::h49b28af2d05b6140
   3:        0x1112ce2d1 - std::panicking::default_hook::hf5d79ad4f1ead81e
   4:        0x11128cba2 - std::panicking::rust_panic_with_hook::h9a3925e37821d434
   5:        0x1110b5064 - std::panicking::begin_panic::hf0f914ab539f4b11
   6:        0x1110b5e3d - rustc_errors::DiagnosticBuilder::emit::haacc27515381e284
   7:        0x10cfa35d5 - rustc_metadata::loader::Context::report_load_errs::h63c74876789120d2
   8:        0x10cfa74c7 - rustc_metadata::creader::CrateReader::read_extension_crate::h5f2698b5b28042ed
   9:        0x10cfa7a20 - rustc_metadata::creader::CrateReader::read_exported_macros::h3f2088cae1e5afd0
  10:        0x10cfd93fc - _<rustc_metadata..macro_import..MacroLoader<'a> as syntax..ext..base..MacroLoader>::load_crate::h7b3d3b92fd9f332b
  11:        0x110b6e4ed - _<syntax..ext..expand..MacroExpander..load_macros..MacroLoadingVisitor<'a, 'b> as syntax..visit..Visitor>::visit_item::hf16d0ef0a8dd0edd
  12:        0x110b91a8a - syntax::ext::expand::expand_crate::h9b29ec58b7166380
  13:        0x10c086a33 - rustc_driver::driver::phase_2_configure_and_expand::_{{closure}}::h5c397c99b1ec3879
  14:        0x10c07d63a - rustc_driver::driver::phase_2_configure_and_expand::hecd5152cdf8e1dda
  15:        0x10c04db02 - rustc_driver::driver::compile_input::h2d1b58b831f06a86
  16:        0x10c03c983 - rustc_driver::run_compiler::h833483649bdaa9c3
  17:        0x10c03989c - std::panicking::try::call::hd16aacc09eeeaf9e
  18:        0x1112d558b - __rust_try
  19:        0x1112d5525 - __rust_maybe_catch_panic
  20:        0x10c03a425 - _<F as alloc..boxed..FnBox<A>>::call_box::hbf614b3f826456b6
  21:        0x1112cd0d8 - std::sys::thread::Thread::new::thread_start::h2e98425c7fffa990
  22:     0x7fff8d48d99c - _pthread_body
  23:     0x7fff8d48d919 - _pthread_start

make: *** [x86_64-apple-darwin/stage1/lib/rustlib/x86_64-apple-darwin/lib/stamp.term] Error 101