ICE in type checking - cannot apply unary operator #19602

<std macros>:8:12: 38:39 error: cannot apply unary operator `!` to type `char`
<std macros>:8         if !$cond {
<std macros>:9             panic!($($arg),+)
<std macros>:10         }
<std macros>:11     );
<std macros>:12 )
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' panicked at 'index out of bounds: the len is 12 but the index is 12', /home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/libsyntax/lib.rs:1

stack backtrace:
   1:     0x7fb2cf4683e0 - rt::backtrace::imp::write::h50b71c7573aa44d5Bgt
   2:     0x7fb2cf46b460 - failure::on_fail::hc49a9332645beb08cCt
   3:     0x7fb2cfc1fc60 - unwind::begin_unwind_inner::hfe5348fa0e613e77E9c
   4:     0x7fb2cfc1f8e0 - unwind::begin_unwind_fmt::h48b873903726e60f66c
   5:     0x7fb2cfc1f8a0 - rust_begin_unwind
   6:     0x7fb2cfc67140 - panicking::panic_fmt::hbfadc17a8c01315cEbk
   7:     0x7fb2cfc66f90 - panicking::panic_bounds_check::h73ba7baff614d114dak
   8:     0x7fb2ce393f20 - codemap::FileMap::get_line::h192934b979bc5d3ed3E
   9:     0x7fb2ce3c2d50 - diagnostic::emit::h0ba7a9b0a713f542FtG
  10:     0x7fb2ce3bf9a0 - diagnostic::EmitterWriter.Emitter::emit::h01878845221ff36aupG
  11:     0x7fb2ce3be1b0 - diagnostic::Handler::emit::h44371b5cad933b62d7F
  12:     0x7fb2ce3907a0 - diagnostic::SpanHandler::span_err::h87dd4a425f0a4994dVF
  13:     0x7fb2d061dde0 - middle::typeck::infer::InferCtxt<'a, 'tcx>::type_error_message_str_with_expected::h042559e2867ebbbcGSi
  14:     0x7fb2d054b8a0 - middle::typeck::infer::InferCtxt<'a, 'tcx>::type_error_message::hd9209b296102c05cSXi
  15:     0x7fb2d057d970 - middle::typeck::check::check_expr_with_unifier::check_user_unop::closure.133616
  16:     0x7fb2d057c3f0 - middle::typeck::check::check_expr_with_unifier::lookup_op_method::hcfc648f6228d30741OZ
  17:     0x7fb2d055d010 - middle::typeck::check::check_expr_with_unifier::check_user_unop::h03d1f1e99cf9de8eb6Z
  18:     0x7fb2d0552260 - middle::typeck::check::check_expr_with_unifier::hf8fe8eef68996629CDZ
  19:     0x7fb2d0552260 - middle::typeck::check::check_expr_with_unifier::hf8fe8eef68996629CDZ
  20:     0x7fb2d05abd60 - middle::typeck::check::check_stmt::h9f595cf8617a1f47zK1
  21:     0x7fb2d0516e80 - middle::typeck::check::check_block_with_expected::h0fea93573b81044aIO1
  22:     0x7fb2d0513910 - middle::typeck::check::check_fn::h1b4757f4032ec37b2fW
  23:     0x7fb2d0513650 - middle::typeck::check::check_bare_fn::h8859bc9921fa87cah5V
  24:     0x7fb2d05199b0 - middle::typeck::check::check_method_body::h254a30cb3173ff69aAW
  25:     0x7fb2d050f760 - middle::typeck::check::check_item::h681bf31078c35e88qpW
  26:     0x7fb2d05130c0 - visit::walk_mod::h8538191843827045767
  27:     0x7fb2d0513410 - middle::typeck::check::check_item_types::haaf57373a94a7fcer4V
  28:     0x7fb2d0009500 - util::common::time::h8626294688042829121
  29:     0x7fb2d0837300 - middle::typeck::check_crate::hfa212ee0e17fb693lrp
  30:     0x7fb2d089f970 - driver::driver::phase_3_run_analysis_passes::h70b3e1b9e7435761M9B
  31:     0x7fb2d089a800 - driver::driver::compile_input::h43620c662d0342b9xQB
  32:     0x7fb2d0922000 - driver::run_compiler::h2eff8561814a6434OGF
  33:     0x7fb2d0921ef0 - driver::run::closure.146242
  34:     0x7fb2d0022da0 - task::TaskBuilder<S>::try_future::closure.104747
  35:     0x7fb2d0022b90 - task::TaskBuilder<S>::spawn_internal::closure.104718
  36:     0x7fb2d117bb00 - task::NativeSpawner.Spawner::spawn::closure.2456
  37:     0x7fb2cfc74bc0 - rust_try_inner
  38:     0x7fb2cfc74bb0 - rust_try
  39:     0x7fb2cfc1d5e0 - unwind::try::he984010f47153659mYc
  40:     0x7fb2cfc1d470 - task::Task::run::had29636eca7af1a3u4b
  41:     0x7fb2d117b840 - task::NativeSpawner.Spawner::spawn::closure.2382
  42:     0x7fb2cfc1ec80 - thread::thread_start::h1833ce4dca7b1a7erpc
  43:     0x7fb2cac5e250 - start_thread
  44:     0x7fb2cf8f93b9 - clone
  45:                0x0 - <unknown>