Use visitor to assign comments

This fixes the long-standing issue where a comment would get assigned
to all nodes with the same starting position, instead of only the
outer-most one.

Use visitor to assign comments

This fixes the long-standing issue where a comment would get assigned
to all nodes with the same starting position, instead of only the
outer-most one.

Fixes #253.

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Add newline at end of file for many tests

Add the newline in reconstructTest() and run updateTests.php, to
reduce spurious diffs in the future.

Rename Scalar\LNumber to Scalar\Int_

Remove PHP 5 parser

Allow expressions in isset()

Partial fix for #653. PHP 7 allows expressions inside isset(), but
rejects non-variables in the compiler. A side-effect of this is that
isset(($x)) is al

Allow expressions in isset()

Partial fix for #653. PHP 7 allows expressions inside isset(), but
rejects non-variables in the compiler. A side-effect of this is that
isset(($x)) is allowed, though this is not intentional.

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