Panic on loading SVG file

[Shnatsel]

The attached SVG file causes a panic when loaded in the native demo app. Tested on commit 5d5d303

stress.svg.zip - zipped so that github would accept the upload.

Backtrace:

Oh noez! Panic! 💥
Message:  index out of bounds: the len is 1 but the index is 1
Location: renderer/src/tiles.rs:264

Run with RUST_BACKTRACE=full to include source snippets.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
                          (7 post panic frames hidden)                          
 7: core::panicking::panic_bounds_check::hf0c95c4cc84d34ca
    at src/libcore/panicking.rs:61
 8: pathfinder_renderer::tiles::Tiler::generate_tiles::hfc169b80f1641916
    at <unknown source file>
 9: pathfinder_renderer::builder::SceneBuilder::build_path::hce897e2e946b5d4c
    at <unknown source file>
10: rayon::iter::plumbing::Producer::fold_with::h50fa76b5f0b3163a
    at <unknown source file>
11: rayon::iter::plumbing::bridge_producer_consumer::helper::h69dbadf04bd92d21
    at <unknown source file>
12: std::panicking::try::do_call::h6c4c1ab0f10124be
    at <unknown source file>
13: __rust_maybe_catch_panic
    at src/libpanic_unwind/lib.rs:80
14: <rayon_core::job::StackJob<L,F,R> as rayon_core::job::Job>::execute::h9adf8b7ae0ef7bc2
    at <unknown source file>
15: rayon_core::registry::WorkerThread::wait_until_cold::h217a69f524408fb0
    at <unknown source file>
16: rayon_core::registry::main_loop::h170a63d799a69fb7
    at <unknown source file>
17: std::panicking::try::do_call::hdc23013fbb359370
    at <unknown source file>
18: __rust_maybe_catch_panic
    at src/libpanic_unwind/lib.rs:80
19: core::ops::function::FnOnce::call_once{{vtable.shim}}::h1e9e799cd2b2c8fd
    at <unknown source file>
20: <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h2877b2aefb0fd627
    at /rustc/625451e376bb2e5283fc4741caa0a3e8a2ca4d54/src/liballoc/boxed.rs:787
21: <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h13f473dbcdaa0fef
    at /rustc/625451e376bb2e5283fc4741caa0a3e8a2ca4d54/src/liballoc/boxed.rs:787
22: std::sys_common::thread::start_thread::h562a7c4953cb1d31
    at src/libstd/sys_common/thread.rs:13
23: std::sys::unix::thread::Thread::new::thread_start::h382c6ae14181d163
    at src/libstd/sys/unix/thread.rs:79
24: start_thread
    at <unknown source file>
25: __clone
    at <unknown source file>
26: <unknown>
    at <unknown source file>
Oh noez! Panic! 💥
Message:  called `Result::unwrap()` on an `Err` value: RecvError
Location: src/libcore/result.rs:1084

Run with RUST_BACKTRACE=full to include source snippets.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
                          (8 post panic frames hidden)                          
 8: demo::main::h0b665984c7ae2ba3
    at <unknown source file>
 9: std::rt::lang_start::{{closure}}::hc8bed131044e1138
    at <unknown source file>
10: std::rt::lang_start_internal::{{closure}}::h4e93c1949c7a1955
    at src/libstd/rt.rs:49
11: std::panicking::try::do_call::h9440ccd4dc467eaa
    at src/libstd/panicking.rs:296
12: __rust_maybe_catch_panic
    at src/libpanic_unwind/lib.rs:80
13: std::panicking::try::hc046e7ee42ee744f
    at src/libstd/panicking.rs:275
14: std::panic::catch_unwind::h27dfc457c200aee0
    at src/libstd/panic.rs:394
15: std::rt::lang_start_internal::hea1b49a567afe309
    at src/libstd/rt.rs:48
16: main
    at <unknown source file>
17: __libc_start_main
    at <unknown source file>
18: _start
    at <unknown source file>
19: <unknown>
    at <unknown source file>

[pcwalton]

This no longer panics for me.