execution.log

puppet apply parse_order.pp
Notice: Compiled catalog for ganymede.corp.puppetlabs.net in environment production in 0.16 seconds
Notice: foo
Notice: /Stage[main]/Foo/Notify[foo]/message: defined 'message' as 'foo'
Notice: after the include
Notice: /Stage[main]/Main/Notify[after the include]/message: defined 'message' as 'after the include'
Notice: Applied catalog in 0.05 seconds

parse_order.pp

class foo {
  notify { 'foo': }
}

if defined(Class['foo']) {
  notify { 'before the include': }
}

include foo

if defined(Class['foo']) {
  notify { 'after the include': }
}