callstack.rb

# .puppetlabs/etc/code/modules/acme/lib/puppet/functions/acme/callstack.rb
Puppet::Functions.create_function(:'acme::callstack') do
  dispatch :stack do

  end

  def stack
    Puppet::Pops::PuppetStack.stacktrace()
  end
end

gistfile1.txt

$ puppet apply test.pp
Notice: Scope(Class[One]): [/home/rip/test.pp, 3]
Notice: Scope(Class[One]): [/home/rip/test.pp, 8]
Notice: Compiled catalog for dev1.devco.net in environment production in 0.03 seconds

test.pp

# test.pp
class one {
  acme::callstack().each |$trace| {
    notice($trace)
  }
}

include one