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 1.23.0-nightly (5041b3bb3 2017-11-19) running on x86_64-unknown-linux-gnu

thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: (MoveData { move_paths: [MovePath { lvalue: _0 }, MovePath { lvalue: _1 }, MovePath { lvalue: _2 }, MovePath { first_child: mp16, lvalue: _3 }, MovePath { lvalue: _4 }, MovePath { lvalue: _5 }, MovePath { lvalue: _6 }, MovePath { lvalue: _7 }, MovePath { lvalue: _8 }, MovePath { lvalue: _9 }, MovePath { lvalue: _10 }, MovePath { lvalue: _11 }, MovePath { lvalue: _12 }, MovePath { lvalue: _13 }, MovePath { lvalue: _14 }, MovePath { lvalue: _15 }, MovePath { parent: mp3, first_child: mp17, lvalue: (_3 as Some) }, MovePath { parent: mp16, lvalue: ((_3 as Some).0: &'<empty> mut literal::StringFragment) }], moves: [mp6@bb0[5], mp6@bb1[1], mp4@bb1[2], mp4@bb2[0], mp10@bb8[6], mp7@bb9[0], mp11@bb10[0], mp10@bb10[1], mp7@bb12[0], mp15@bb13[0], mp14@bb13[1], mp14@bb14[0], mp14@bb15[0], mp13@bb16[0], mp14@bb17[0], mp12@bb17[1], mp13@bb17[1], mp13@bb18[0], mp13@bb19[0], mp12@bb19[1], mp7@bb20[0], mp3@bb20[1], mp5@bb20[2]], loc_map: LocationMap { map: [[[], [], [], [], [], [mo0]], [[], [mo1], [mo2]], [[mo3], [], []], [[], [], [], [], [], [], []], [[]], [[]], [[]], [[], []], [[], [], [], [], [], [], [mo4]], [[mo5]], [[mo6], [mo7], []], [[]], [[mo8]], [[mo9], [mo10]], [[mo11]], [[mo12]], [[mo13]], [[mo14], [mo15, mo16]], [[mo17]], [[mo18], [mo19], []], [[mo20], [mo21], [mo22], []]] }, path_map: [[], [], [], [mo21], [mo2, mo3], [mo22], [mo0, mo1], [mo5, mo8, mo20], [], [], [mo4, mo7], [mo6], [mo15, mo19], [mo13, mo16, mo17, mo18], [mo10, mo11, mo12, mo14], [mo9], [], []], rev_lookup: MovePathLookup { locals: [mp0, mp1, mp2, mp3, mp4, mp5, mp6, mp7, mp8, mp9, mp10, mp11, mp12, mp13, mp14, mp15], projections: {(mp3, Downcast(std::option::Option, 1)): mp16, (mp16, Field(field[0], AbstractType)): mp17} } }, [IllegalMove { cannot_move_out_of: IllegalMoveOrigin { span: src/literal.rs:46:41: 46:51, kind: BorrowedContent } }])', /checkout/src/libcore/result.rs:906:4
note: Run with `RUST_BACKTRACE=1` for a backtrace.

error: Could not compile `nafi-tokens`.