PHP 8.2.0beta2 emits false positive deprecation warning before fatal error for `"{$g{'h'}}"`;

[TysonAndre]

Description

The following code:

<?php $x = "{$g{'h'}}";

Resulted in this output:

Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in php shell code on line 1

Fatal error: Array and string offset access syntax with curly braces is no longer supported in php shell code on line 1

But I expected this output instead:

Fatal error: Array and string offset access syntax with curly braces is no longer supported in php shell code on line 1

(i.e. there is no use of ${} for string interpolation)

The cause is that the constants used for ast node flags have identical values, causing this ambiguity.

#define ZEND_DIM_ALTERNATIVE_SYNTAX (1 << 1) /* deprecated curly brace usage */
#define ZEND_ENCAPS_VAR_DOLLAR_CURLY_VAR_VAR (1<<1)

PHP Version

PHP 8.2.0beta2

Operating System

No response