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Browser.html causes a panic cascade in constellation #10017

@Manishearth

Description

@Manishearth

On 075ce98 on Linux, running ./mach run -r -w -b gives me this long panic

The initial panic seems to be:

thread 'Constellation' panicked at 'unable to find pipeline - this is a bug', ../src/libcore/option.rs:704
stack backtrace:

   1:     0x7f7467838f90 - sys::backtrace::tracing::imp::write::h578d6e47592a4041cHv
   2:     0x7f746783d33b - panicking::default_handler::_$u7b$$u7b$closure$u7d$$u7d$::closure.44995
   3:     0x7f746783cfa8 - panicking::default_handler::hffa00c845e94c6581nA
   4:     0x7f7467826a5c - sys_common::unwind::begin_unwind_inner::hd824946792143cc8vvu
   5:     0x7f7467826ee8 - sys_common::unwind::begin_unwind_fmt::h3777a045191296c5Buu
   6:     0x7f7467838401 - rust_begin_unwind
   7:     0x7f74678743df - panicking::panic_fmt::h548fe28297c9d83b7mM
   8:     0x7f746787b884 - option::expect_failed::hce0693d5039c3a72iWO
   9:     0x7f7465e8ecbc - constellation::Constellation<LTF, STF>::handle_request::h11537074669471263875
  10:     0x7f7465e73fe7 - sys_common::unwind::try::try_fn::h7432356694187898493
  11:     0x7f746783838b - __rust_try
  12:     0x7f7467834f7d - sys_common::unwind::inner_try::h8ac2089dadb4381bxsu
  13:     0x7f7465e74fda - boxed::F.FnBox<A>::call_box::h16069342354870177152
  14:     0x7f746783bde9 - sys::thread::Thread::new::thread_start::hd111df90784ef3b2llz
  15:     0x7f746380d6a9 - start_thread
  16:     0x7f746332ceec - clone
  17:                0x0 - <unknown>

cc @mbrubeck

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