Build fails on Rust nightly

[ivan]

# cargo run
    Updating registry `https://github.com/rust-lang/crates.io-index`
 Downloading power-assert v0.3.0
   Compiling power-assert v0.3.0
/home/at/.cargo/registry/src/github.com-0a35038f75765ae4/power-assert-0.3.0/src/convert.rs:104:17: 104:35 error: this pattern has 3 fields, but the corresponding variant has 2 fields [E0023]
/home/at/.cargo/registry/src/github.com-0a35038f75765ae4/power-assert-0.3.0/src/convert.rs:104                 ExprMatch(_, _, _) => {
                                                                                                               ^~~~~~~~~~~~~~~~~~
/home/at/.cargo/registry/src/github.com-0a35038f75765ae4/power-assert-0.3.0/src/convert.rs:104:17: 104:35 help: run `rustc --explain E0023` to see a detailed explanation
error: aborting due to previous error
Could not compile `power-assert`.

To learn more, run the command again with --verbose.

# rustc --version
rustc 1.6.0-nightly (2e07996a9 2015-10-29)

[ivan]

Broken by rust-lang/rust@ba43c22 in rust-lang/rust#28857

[gifnksm]

Thank you for reporting 😸

[ivan]

Thanks for the fix, this is really neat :-)