nscala-time と specs2 で `1.day` などの変換に失敗する

原因は両方共に implicit conversion があるからです。

type mismatch;
[error]  found   : Int(1)
[error]  required: ?{def day: ?}
[error] Note that implicit conversions are not applicable because they are ambiguous:
[error]  both method richInt in trait IntImplicits of type (n: Int)com.github.nscala_time.time.RichInt
[error]  and method intToRichLong in trait TimeConversions of type (v: Int)TimeRangeSpec.this.longAsTime
[error]  are possible conversion functions from Int(1) to ?{def day: ?}
[error]         1.day
[error]         ^
[error] one error found
[error] (redshift/test:compile) Compilation failed
[error] Total time: 3 s, completed May 22, 2014 8:33:52 PM

Specs2 は NoTimeConversions という trait を用意しているので、 mixin することで specs2 側の implicit を無効にできる。

import org.specs2.mutable.Specification
class FooSpec extends Specification with NoTimeConversions