Unexpected internal compiler error using incompatible rlib

[milibopp]

I accidentally tried to link a library (rlib from current master of nalgebra) that I had compiled earlier with a slightly older version of rustc (not entirely sure which though...) than the current one that I used for linking and ran into this error:

error: internal compiler error: unexpected failure
This message reflects a bug in the Rust compiler. 
We would appreciate a bug report: http://static.rust-lang.org/doc/master/complement-bugreport.html
note: the compiler hit an unexpected failure path. this is a bug
Ok(task 'rustc' failed at 'assertion failed: lib.dylib.is_none()', /tmp/yaourt-tmp-eduard/aur-rust-git/src/rust/src/librustc/metadata/loader.rs:210
)

Minimal source code:

extern mod nalgebra;
fn main() {}

My mistake is obvious but this still appears to be a bug in error detection.

[alexcrichton]

This should be closed by #12164, I need to figure out why it's failing on android...

The gist of the problem is that you probably have multiple copies of libnalgebra and the compiler doesn't like multiple copies lying around.