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import scala.reflect.macros.BlackboxContext
object Impls1 {
def foo(c: BlackboxContext)(x: c.Expr[Int]) = x
}
object Impls2 {
def foo[T](c: BlackboxContext)(x: c.Expr[T]) =
throw new Error("an implementation is missing")
}
object Impls3 {
def foo[T](c: BlackboxContext)(x: c.Expr[T]): c.Expr[T] = x
}
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