thread 'main' panicked at 'Expected register: Unassigned', lib/codegen/src/ir/valueloc.rs:40:18
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::print
             at libstd/sys_common/backtrace.rs:71
             at libstd/sys_common/backtrace.rs:59
   2: std::panicking::default_hook::{{closure}}
             at libstd/panicking.rs:211
   3: std::panicking::default_hook
             at libstd/panicking.rs:227
   4: std::panicking::rust_panic_with_hook
             at libstd/panicking.rs:463
   5: std::panicking::begin_panic_fmt
             at libstd/panicking.rs:350
   6: cretonne_codegen::regalloc::coloring::Context::visit_ebb
             at lib/codegen/src/ir/valueloc.rs:40
             at lib/codegen/src/regalloc/coloring.rs:1073
             at lib/codegen/src/regalloc/coloring.rs:178
   7: cretonne_codegen::regalloc::coloring::Coloring::run
             at lib/codegen/src/regalloc/coloring.rs:152
             at lib/codegen/src/regalloc/coloring.rs:138
   8: cretonne_codegen::regalloc::context::Context::run
             at lib/codegen/src/regalloc/context.rs:143
   9: cretonne_codegen::context::Context::compile
             at lib/codegen/src/context.rs:295
             at lib/codegen/src/context.rs:146
  10: cton_util::wasm::run
             at src/wasm.rs:161
             at src/wasm.rs:52
  11: cton_util::main
             at src/cton-util.rs:117
             at src/cton-util.rs:140
  12: std::rt::lang_start::{{closure}}
             at /checkout/src/libstd/rt.rs:74
  13: std::panicking::try::do_call
             at libstd/rt.rs:59
             at libstd/panicking.rs:310
  14: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:105
  15: std::rt::lang_start_internal
             at libstd/panicking.rs:289
             at libstd/panic.rs:374
             at libstd/rt.rs:58
  16: main
  17: __libc_start_main
  18: _start