Compiler panic 'index out of bounds'

[Antiarchitect]

I tried this to compile:

pub fn load(external_id: &String) -> Vec<u8> {
    let map_store_path = construct_store_path(&MAPS_PATH.to_string(), external_id);
    let map_path = construct_storable_path(&map_store_path, external_id);
    let map_file = fs::File::open(&map_path);
    let mut map_bytes = Vec::new();
    try!(map_file.read_to_end(&map_bytes));
    let map = json::decode(&map_bytes).unwrap();

    vec![0]
}

This is what happened:

cargo build --verbose
       Fresh regex-syntax v0.2.2
       Fresh libc v0.1.12
       Fresh rustc-serialize v0.3.16
       Fresh winapi-build v0.1.1
       Fresh gcc v0.3.21
       Fresh winapi v0.2.5
       Fresh libc v0.2.5
       Fresh strsim v0.3.0
       Fresh memchr v0.1.7
       Fresh aho-corasick v0.4.0
       Fresh advapi32-sys v0.1.2
       Fresh regex v0.1.48
       Fresh rand v0.3.13
       Fresh kernel32-sys v0.2.1
       Fresh docopt v0.6.78
       Fresh uuid v0.1.18
       Fresh time v0.1.34
       Fresh rust-crypto v0.2.34
   Compiling rusty-vault v0.1.0 (file:///home/andrey/PROJECTS/rusty-vault)
     Running `rustc src/lib.rs --crate-name rusty_vault --crate-type lib -g --out-dir /home/andrey/PROJECTS/rusty-vault/target/debug --emit=dep-info,link -L dependency=/home/andrey/PROJECTS/rusty-vault/target/debug -L dependency=/home/andrey/PROJECTS/rusty-vault/target/debug/deps --extern uuid=/home/andrey/PROJECTS/rusty-vault/target/debug/deps/libuuid-fed17b74aa7673e2.rlib --extern rustc_serialize=/home/andrey/PROJECTS/rusty-vault/target/debug/deps/librustc_serialize-3c33cb2a40992011.rlib --extern docopt=/home/andrey/PROJECTS/rusty-vault/target/debug/deps/libdocopt-eb02b06dca39e75f.rlib --extern crypto=/home/andrey/PROJECTS/rusty-vault/target/debug/deps/libcrypto-daa20c09deb34369.rlib --extern rand=/home/andrey/PROJECTS/rusty-vault/target/debug/deps/librand-340832a8942cb900.rlib -L native=/home/andrey/PROJECTS/rusty-vault/target/debug/build/rust-crypto-daa20c09deb34369/out`
src/lib.rs:95:19: 95:42 error: no method named `read_to_end` found for type `core::result::Result<std::fs::File, std::io::error::Error>` in the current scope
src/lib.rs:95     try!(map_file.read_to_end(&map_bytes));
                                ^~~~~~~~~~~~~~~~~~~~~~~
src/lib.rs:95:5: 95:44 note: in this expansion of try! (defined in <std macros>)
<std macros>:5:8: 6:42 error: mismatched types:
 expected `collections::vec::Vec<u8>`,
    found `core::result::Result<_, _>`
(expected struct `collections::vec::Vec`,
    found enum `core::result::Result`) [E0308]
<std macros>:5 return $ crate:: result:: Result:: Err (
<std macros>:6 $ crate:: convert:: From:: from ( err ) ) } } )
src/lib.rs:95:5: 95:44 note: in this expansion of try! (defined in <std macros>)
<std macros>:5:8: 6:42 help: run `rustc --explain E0308` to see a detailed explanation
src/lib.rs:96:28: 96:38 error: mismatched types:
 expected `&str`,
    found `&collections::vec::Vec<_>`
(expected str,
    found struct `collections::vec::Vec`) [E0308]
src/lib.rs:96     let map = json::decode(&map_bytes).unwrap();
                                         ^~~~~~~~~~
src/lib.rs:96:28: 96:38 help: run `rustc --explain E0308` to see a detailed explanation
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
thread 'rustc' panicked at 'index out of bounds: the len is 41 but the index is 43', ../src/libcollections/vec.rs:1132
stack backtrace:
   1:     0x7f9f14f35bf0 - sys::backtrace::tracing::imp::write::haa19c02b4de52f3bG0t
   2:     0x7f9f14f3c7d5 - panicking::log_panic::_<closure>::closure.41218
   3:     0x7f9f14f3c26f - panicking::log_panic::h527fe484e9de8fe1W7x
   4:     0x7f9f14f058c3 - sys_common::unwind::begin_unwind_inner::h51f64b1a34c60827fTs
   5:     0x7f9f14f06228 - sys_common::unwind::begin_unwind_fmt::h0845853a1913f45blSs
   6:     0x7f9f14f33a41 - rust_begin_unwind
   7:     0x7f9f14f844ff - panicking::panic_fmt::h3967afc085fe8067LFK
   8:     0x7f9f14f846e2 - panicking::panic_bounds_check::h3ef0001c29fc27faREK
   9:     0x7f9f12931fba - middle::infer::freshen::_<impl>::fold_ty::h385c5e4b6e47b7b2DTA
  10:     0x7f9f1293301a - middle::ty::fold::TypeFolder::fold_substs::h9623948748133425890
  11:     0x7f9f1288edab - middle::traits::select::_<impl>::select::h72d9651b4643fb4ek9V
  12:     0x7f9f1299a699 - middle::traits::fulfill::process_predicate::h1b5045a3d87829cbzxT
  13:     0x7f9f12999011 - middle::traits::fulfill::_<impl>::select::h72ea95d19c079f78lrT
  14:     0x7f9f12998b67 - middle::traits::fulfill::_<impl>::select_where_possible::hefc120b787239eacPpT
  15:     0x7f9f1302a929 - check::_<impl>::select_obligations_where_possible::h25ff65c70a796932hdr
  16:     0x7f9f13044416 - check::_<impl>::resolve_type_vars_if_possible::h70b6d1b4ea56d8a2ihq
  17:     0x7f9f130588ea - check::structurally_resolved_type::habb550ef2b21cf6fNLu
  18:     0x7f9f1306e139 - check::check_expr_with_unifier::check_method_call::hc6178cfb274295c2pfs
  19:     0x7f9f1307d23d - check::check_expr_with_unifier::h11438309499393148616
  20:     0x7f9f130a432d - check::check_decl_initializer::hba6d574e1579b6b5mvt
  21:     0x7f9f130a43c8 - check::check_decl_local::he10984636f0a7d09ywt
  22:     0x7f9f130a495f - check::check_stmt::hb85f5b931ade7374oyt
  23:     0x7f9f1303410f - check::check_block_with_expected::h941a3b8ddab8cb3elCt
  24:     0x7f9f13027913 - check::check_fn::h55a894fbba67c54a0np
  25:     0x7f9f13021f88 - check::check_bare_fn::hbaa926eb29147a7fpdp
  26:     0x7f9f1301ed85 - check::check_item_body::h8b0cc3f68dab1b260Cp
  27:     0x7f9f1301569e - check::check_item_bodies::h8cbb1440ac817150xbp
  28:     0x7f9f1300da5a - check_crate::h3c513ff74deef0a2jxD
  29:     0x7f9f1543bca8 - driver::phase_3_run_analysis_passes::_<closure>::closure.25599
  30:     0x7f9f1541f813 - middle::ty::context::_<impl>::create_and_enter::create_and_enter::h13716335538836217011
  31:     0x7f9f1541b251 - driver::phase_3_run_analysis_passes::h5249241190295309167
  32:     0x7f9f153f0559 - driver::compile_input::h58ee58653fb11a3ehca
  33:     0x7f9f153e277b - run_compiler::hd4933b7af1175e4aOwc
  34:     0x7f9f153df436 - sys_common::unwind::try::try_fn::try_fn::h5795434642313485966
  35:     0x7f9f14f33888 - __rust_try
  36:     0x7f9f14f2b18b - sys_common::unwind::try::inner_try::h771fec597ec8f35cNPs
  37:     0x7f9f153df790 - boxed::_<impl>::call_box::call_box::h18189923456789545281
  38:     0x7f9f14f3acd3 - sys::thread::_<impl>::new::thread_start::haf749b76474da6b089w
  39:     0x7f9f0ebd4609 - start_thread
  40:     0x7f9f14bc6a4c - clone
  41:                0x0 - <unknown>

Could not compile `rusty-vault`.

Caused by:
  Process didn't exit successfully: `rustc src/lib.rs --crate-name rusty_vault --crate-type lib -g --out-dir /home/andrey/PROJECTS/rusty-vault/target/debug --emit=dep-info,link -L dependency=/home/andrey/PROJECTS/rusty-vault/target/debug -L dependency=/home/andrey/PROJECTS/rusty-vault/target/debug/deps --extern uuid=/home/andrey/PROJECTS/rusty-vault/target/debug/deps/libuuid-fed17b74aa7673e2.rlib --extern rustc_serialize=/home/andrey/PROJECTS/rusty-vault/target/debug/deps/librustc_serialize-3c33cb2a40992011.rlib --extern docopt=/home/andrey/PROJECTS/rusty-vault/target/debug/deps/libdocopt-eb02b06dca39e75f.rlib --extern crypto=/home/andrey/PROJECTS/rusty-vault/target/debug/deps/libcrypto-daa20c09deb34369.rlib --extern rand=/home/andrey/PROJECTS/rusty-vault/target/debug/deps/librand-340832a8942cb900.rlib -L native=/home/andrey/PROJECTS/rusty-vault/target/debug/build/rust-crypto-daa20c09deb34369/out` (exit code: 101)

rustc 1.6.0 (c30b771ad 2016-01-19) binary: rustc commit-hash: c30b771ad9d44ab84f8c88b80c25fcfde2433126 commit-date: 2016-01-19 host: x86_64-unknown-linux-gnu release: 1.6.0