ICE: LLVM Assertion failed: Invalid operand types for ICmp instruction

[rndr]

Os is Ubuntu 14.04.1 LTS on amd64

uname -a is Linux ubuntu 3.13.0-34-generic #60-Ubuntu SMP Wed Aug 13 15:45:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

rustc -v is rustc 0.12.0-pre-nightly (e024017f6 2014-09-04 20:21:02 +0000)

Code (as minimal as i could get it to not work):

use std::io::BufReader;

mod test {
    use std::io::{Reader,IoError};
    use std::collections::HashMap;

    pub type TEST<'t> = HashMap<u16, Option<Box<DataFormat>>>;

    enum DataFormat {
        Something(str),
        Undefined
    }

    enum ByteOrder {
        BigEndian,
        LittleEndian
    }

    impl<T: Reader> DataFormat {
        fn read(&mut self, stream: &mut T, order: ByteOrder) -> Result<Box<DataFormat>, IoError> {
            let (tag, format) = match order {
                BigEndian =>
                    (try!(stream.read_be_u16()), try!(stream.read_be_u16())),
                LittleEndian =>
                    (try!(stream.read_le_u16()), try!(stream.read_le_u16())),
            };
            Ok(box Undefined)
        }
    }

    pub fn parse<T: Reader>(stream: &mut T) -> Result<(), IoError> {
        let mut test: TEST = HashMap::new();
        Ok(())
    }
}

fn main() {
    let mut buf = [0, 1, 2, 3];
    let mut r = BufReader::new(buf);
    test::parse(&mut r);
    return;
}

Output (with warnings skipped):

rustc: /home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/llvm/include/llvm/IR/Instructions.h:987: void llvm::ICmpInst::AssertOK(): Assertion `(getOperand(0)->getType()->isIntOrIntVectorTy() || getOperand(0)->getType()->isPtrOrPtrVectorTy()) && "Invalid operand types for ICmp instruction"' failed.
Aborted (core dumped)

[bkoropoff]

I can't repro this on latest master. Instead I get a compiler error:

test.rs:27:20: 27:29 error: cannot move a value of type test::DataFormat: the size of test::DataFormat cannot be statically determined [E0161]
test.rs:27             Ok(box Undefined)
                              ^~~~~~~~~
error: aborting due to previous error

You probably meant for DataFormat to be:

    enum DataFormat {
        Something(String),
        Undefined
    }

The code then successfully compiles. I suspect this was DST fallout that got fixed already.

[rndr]

Can confirm, fixed in latest nightly build for me.
rustc 0.12.0-pre-nightly (79a5448f4 2014-09-13 20:36:02 +0000)