rustc stack overflow by "hit an unexpected failure path"

[lht]

type x = {
  r: u
};
tag u {
  t(x);
}
fn main() {}

Compile the above (faulty) code with RUST_LOG=rustc=0,::rt::backtrace rustc foo.rs gives me this:

rust: task aa2c30 ran out of stack
/opt/apps/rust/bin/../lib/librustrt.so(_ZN9rust_task4failEv+0x25)[0x7fe862bfb7f5]
/opt/apps/rust/bin/../lib/librustrt.so(+0x1ebb5)[0x7fe862bfbbb5]
/opt/apps/rust/bin/../lib/librustrt.so(_ZN9rust_task9new_stackEmPvm+0x3c)[0x7fe862bfbf1c]
/opt/apps/rust/bin/../lib/librustrt.so(upcall_s_new_stack+0x1d)[0x7fe862bfe28d]
/opt/apps/rust/bin/../lib/librustrt.so(+0x32129)[0x7fe862c0f129]
/opt/apps/rust/bin/../lib/librustrt.so(upcall_new_stack+0x42)[0x7fe862bff3c2]
/opt/apps/rust/bin/../lib/libstd-79ca5fac56b63fde-0.1.so(+0xd2a79)[0x7fe8634b7a79]
/opt/apps/rust/bin/../lib/libstd-79ca5fac56b63fde-0.1.so(_ZN3map7chained3get17_53584225ac3372a2E+0x4be)[0x7fe86342fe6e]
/opt/apps/rust/bin/../lib/libstd-79ca5fac56b63fde-0.1.so(_ZN3map7chained8map130634find17_99d086d8959e784dE+0x62)[0x7fe863433462]
/opt/apps/rust/bin/../lib/libstd-79ca5fac56b63fde-0.1.so(+0x8db72)[0x7fe863472b72]
/opt/apps/rust/bin/../lib/librustc-4171d83aef249987-0.1.so(_ZN6middle2ty12tag_variants17_d9d12d749dec2b12E+0xa5)[0x7fe862dfe045]
/opt/apps/rust/bin/../lib/librustc-4171d83aef249987-0.1.so(_ZN6middle2ty26type_structurally_contains17_386b82bc6c3f7371E+0x338)[0x7fe862de1f38]
/opt/apps/rust/bin/../lib/librustc-4171d83aef249987-0.1.so(_ZN6middle2ty26type_structurally_contains17_386b82bc6c3f7371E+0x68d)[0x7fe862de228d]
/opt/apps/rust/bin/../lib/librustc-4171d83aef249987-0.1.so(_ZN6middle2ty26type_structurally_contains17_386b82bc6c3f7371E+0x4fd)[0x7fe862de20fd]
/opt/apps/rust/bin/../lib/librustc-4171d83aef249987-0.1.so(_ZN6middle2ty26type_structurally_contains17_386b82bc6c3f7371E+0x68d)[0x7fe862de228d]
[...250+ lines more like above...]
error: internal compiler error unexpected failure
note: The compiler hit an unexpected failure path. This is a bug. Try running with RUST_LOG=rustc=0,::rt::backtrace to get further details and report the results to github.com/mozilla/rust/issues
rust: upcall fail 'explicit failure', ../src/comp/driver/rustc.rs:175
/opt/apps/rust/bin/../lib/librustrt.so(_ZN9rust_task4failEv+0x25)[0x7fe862bfb7f5]
/opt/apps/rust/bin/../lib/librustrt.so(+0x32129)[0x7fe862c0f129]
/opt/apps/rust/bin/../lib/librustrt.so(upcall_fail+0x39)[0x7fe862bfed09]
rustc[0x407b1d]
rustc[0x40cfbc]
rustc[0x407d15]
rustc[0x407df2]
/opt/apps/rust/bin/../lib/librustrt.so(task_start_wrapper+0x32)[0x7fe862bfa9d2]
rust: domain main @0xa8dc60 root task failed

rustc --version
rustc prerelease (94cd792 2012-01-18 09:39:19 +0100)
host: x86_64-unknown-linux-gnu

[jdm]

Probably related to #742.

[lht]

Thanks for the information! Close this one.