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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Represent names using string rather than array of parts

In most circumstances we are interested in the whole string, not
the parts split by namespace separator. As names are common, this

Represent names using string rather than array of parts

In most circumstances we are interested in the whole string, not
the parts split by namespace separator. As names are common, this
representation measurably improves memory usage and performance.

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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

[PHP 8.0] Add match expressions (#672)

RFC: https://wiki.php.net/rfc/match_expression_v2
Upstream implementation: php/php-src#5371

Closes #671.