Jira (PUP-7061) Multiple hiera functions in one string does not work with hiera v4

Title: Message Title

PUP-7061

I don't recognize this error. Judging by the code, it should be impossible to get that error.
Current master of invocation.rb looks like this:

    @name_stack.push(name)

    begin

      yield

    rescue Puppet::DataBinding::LookupError

      raise

    rescue Puppet::Error => detail

      raise Puppet::DataBinding::LookupError.new(detail.message, detail)

    ensure

      @name_stack.pop  # <--- This is line 79 where the "undefined method `pop' for nil:NilClass" occurs

end

Version 4.8.1 has a different pop on the same line. The code looks like this:

        @explainer.push(qualifier_type, qualifier)

        begin

          yield

        ensure

          @explainer.pop  # <--- This is line 79 where the "undefined method `pop' for nil:NilClass" occurs

end

In both cases, the attribute that is there before the begin should also be there in ensure.

I've tried a common.yaml with the content below on various puppet versions without being able to reproduce the problem:

profile::proxy::host: example.com

profile::proxy::port: 8080

profile::proxy::url: "http://%{hiera('profile::proxy::host')}:%{hiera('profile::proxy::port')}"

I know we've had some really weird errors caused by an updating puppet while Puppet Server is running. Could that be the case here?

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