Josh Wolfe c6605cba83 blocks check that their statements are void ...

closes #291

This changes the error message "return value ignored" to "expression value is ignored".
This is because this error also applies to {1;}, which has no function calls.

Also fix ignored expression values in std and test.
This caught a bug in debug.readAllocBytes where an early Eof error would have been missed.
See #219.

2017-04-23 21:15:15 -07:00

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