gistfile1.txt

scala> :paste
// Entering paste mode (ctrl-D to finish)

import language.implicitConversions
class A; class B; class C
implicit def a2b(a: A) = new B
implicit def b2c(b: B) = new C

// Exiting paste mode, now interpreting.

import language.implicitConversions
defined class A
defined class B
defined class C
a2b: (a: A)B
b2c: (b: B)C

scala> implicit def chain[T1,T2,T3](implicit c1: T1 => T2, c2: T2 => T3): T1 => T3 = { (x: T1) => c2(c1(x)) }
chain: [T1, T2, T3](implicit c1: T1 => T2, implicit c2: T2 => T3)T1 => T3

scala> implicitly[A => C]
res0: A => C = $$Lambda$3917/534276658@7f7e0dd5