WIP

Implemented AST pretty-printer

Implement return types

RFC is documented here: https://wiki.php.net/rfc/return_types

fix declaration

Provide compiler hook for altering the AST pre-compilation.

bump year

bump year

first shot remove TSRMLS_* things

Test error conditions for ct class const refs

And fix a bug found while doing so...

Changed "inline" into "zend_always_inline"

Initial coalesce operator implementation

Don't distinguish between ast/list in parser

This removes the need to use $<ast>{n} or $<list>$ casts in the
reduction actions.

Keeping the distinction in the parser doesn't rea

Don't distinguish between ast/list in parser

This removes the need to use $<ast>{n} or $<list>$ casts in the
reduction actions.

Keeping the distinction in the parser doesn't really give us any
benefit and only makes changing the grammar harder.

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zend_ast_create determined child count automatically

Remove zend_ast_create_unary etc

Add zend_ast_list* variant to parser stack element

Minor cleanups in AST code

Use separate node type for lists

This saves storing the children count for normal ast nodes.

Store lineno for zval ast nodes more efficiently

Create namespace_name via AST

zend_do_return -> zend_emit_final_return

Make lexer return AST nodes

Add functions for create str/long ast directly

Fix leaks

Must find a good way to handle constant expressions...

Implement declare()

__halt_compiler() without haling compiler