Description:
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OS is Ubuntu 16.04.3 LTS
PHP package is 7.1.11-1+ubuntu16.04.1+deb.sury.org+1 installed from http://ppa.launchpad.net/ondrej/php/ubuntu

While using token_get_all() with TOKEN_PARSE flag; if tested code block has syntax error, then process killed with "Parse error: syntax error".
Example: https://3v4l.org/05lUI




Test script:
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<?php
// Syntax error: tested code has a space between equal signs
$tokens=token_get_all('<?php if($foo= =$bar) {}', TOKEN_PARSE);
var_dump($tokens); // not printed on error

Expected result:
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function returns (FALSE) or throws a catchable error. script continues to run. error could be checked/catched with if, try-catch or error handler.

Actual result:
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script dies with error: (Parse error: syntax error, unexpected '=' in  on line 1)