<?php
$a = ["planet" => "world"];
echo "hello {$a["planet"]}";

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  (php_tag [0, 0] - [0, 5])
  (expression_statement [1, 0] - [1, 27]
    (assignment_expression [1, 0] - [1, 26]
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      right: (array_creation_expression [1, 5] - [1, 26]
        (array_element_initializer [1, 6] - [1, 25]
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  (echo_statement [2, 0] - [2, 28]
    (string [2, 5] - [2, 27])))

(program [0, 0] - [4, 0]
  (php_tag [0, 0] - [0, 5])
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    (assignment_expression [1, 0] - [1, 26]
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  (echo_statement [2, 0] - [2, 28]
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    (ERROR [2, 17] - [2, 27]
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fail/rb.php	0 ms	(ERROR [2, 17] - [2, 27])