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SystemVerilog connecting a channel

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I'm trying to hook up a new channel (channel 2) to an existing one (channel1) like so:

channel channel1;
channel channel2;

extern function new(
channel_type channel2

function subenv1::new(
channel channel2

this.channel1 = new();



//channel1 is a connection between both xactors

//hook new channel2 up to channel1
channel2 = this.channel1

This seems to work fine at this level, ie if I do this check, it doesn't cause a fatal:
if (channel2 ==null) `cvm_fatal

However when I go up to the subenv above this 
if (channel2 ==null) `cvm_fatal

Then I get a fatal. What else do I need to ensure that the channel is not fatal at the next level up?

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