Fix sink statement prefix not exploding Failures
Fix sink statement prefix not exploding Failures

In the Actions it code-genned to call .eager. Not sure
why (copy-pasta from the <eager> in code above?), but
changing that to call .sink showed no stresstest failures.

Bug finding: https://irclog.perlgeek.de/perl6/2016-12-08#i_13706422

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