rust: task ran out of stack

[grahame]

This program fails under rust as of rev 7e6ce66. I've reduced it a bit, but not hugely - I the issue is the recursive reference to the state tag. I don't know if the program is valid (I've reduced it a lot too).

herugrim::~/code/csv $ RUST_LOG=rustc=0,::rt::backtrace rustc csv.rs
rust: task 7fbfa2417040 ran out of stack
0   librustrt.dylib                     0x000000010716d1d3 _ZL7new_stkP14rust_schedulerP9rust_taskm + 1203
1   librustrt.dylib                     0x000000010716d206 _ZN9rust_task9new_stackEmPvm + 50
2   librustrt.dylib                     0x000000010716f675 upcall_s_new_stack + 37
3   librustrt.dylib                     0x000000010717ea19 __morestack + 9
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
0   librustrt.dylib                     0x000000010717ea19 __morestack + 9
rust: domain main @0x7fbfa2818c00 root task failed
[1]    74836 exit 101   RUST_LOG=rustc=0,::rt::backtrace rustc csv.rs

Code:
tag state {
    inescapedfield(uint, uint, bool, state);
}

type rowreader = {
    mutable state : state
};

iface rowiter {
    fn readrow();
}

impl of rowiter for rowreader {
    fn readrow() {
        alt self.state {
            inescapedfield(b, o, at_start, last_state) {
            }
        }
    }
}

fn main()
{
}

[jdm]

This is probably #742.

[brson]

rustc is hitting the arbitrary limit on maximum stack size. The best thing to do in the short term is probably to add core::sys::set_max_stack to set the global max stack size, and have rustc request a gigantic max stack size. I will do that today and close both these.

[brson]

I should have looked closer. This is just rustc recurring infinitely - changing the max stack size won't help.

[brson]

I agree it's the same as #742. Closing as dupe.