Release version 0.1.7

Fix ZTS mode

This requires shifting str_ member variable out of the Zend globals
(which is stored in TLS), and into a true global structure instead

Back to dev

Release version 0.1.6

Add ast\get_metadata() function

This function returns metadata about the AST kinds. Currently this
mainly provides the flags supported by each AST kind.

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Release version 0.1.5

Back to dev

Release version 0.1.4

With fix for handling of nullable types

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Release version 0.1.3

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Release version 0.1.2

Support nullable types

Represent these using a new AST_NULLABLE_TYPE virtual node.

Fix build on PHP 7.1

Back to 0.1.2-dev

Release version 0.1.1 with OSX build fix

Avoid premature macro resolution / Fix OSX build

AST_STR(true) and AST_STR(false) were resolved to AST_STR(1) and
AST_STR(0), so go back to using a str_ prefix everywhere.

Back to 0.1.1-dev

Version 0.1.0

Set version to 0.1.0-dev

Use string child names for non-list nodes

Implementation needs some polishing.

Use X macro for global strings

I plan on adding more of these, so drop all the repetition.

Also add AST_STR() macro to abstract the naming convention.

Add virtual AST_CLOSURE_VAR node Without this you couldn't distinguish a by-ref closure use var

Store the decl name as well if present