Wrapping is broken in rust nightlies

[Dinnerbone]

Run cargo test to verify.

---- avm1::value::test::wrapping_i16 stdout ----
thread 'avm1::value::test::wrapping_i16' panicked at 'assertion failed: `(left == right)`
  left: `-1`,
 right: `0`', core/src/avm1/value.rs:874:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

---- avm1::value::test::wrapping_u16 stdout ----
thread 'avm1::value::test::wrapping_u16' panicked at 'assertion failed: `(left == right)`
  left: `65535`,
 right: `0`', core/src/avm1/value.rs:856:9

It seems to be that float-to-int has changed behaviour.

[Herschel]

Have a fix incoming in 1 minute :-)

[Dinnerbone]

Haha fair enough! I figured I'd open an issue so we don't forget :D