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Error is because blocks_execute_action second parameter is a reference one, but this line of code tries to call it with the result of a function - can't do that, it has to be a variable.
Error is because blocks_execute_action second parameter is a reference one, but this line of code tries to call it with the result of a function - can't do that, it has to be a variable.
I checked in a fix to MOODLE_19+MOODLE_19_MERGED,HEAD. The fix is the obvious one (assign the function call return to a variable, pass that to the function that complained).
In addition to the line mentioned there was another bug (same bug different function) in accesslib. I fixed it the same way.
I have now been able to install my MOODLE_19! (php 5.2, mysql).