Description:
------------
The test script below reads a line of PHP code, evaluates it, and
prints its return value or catches and prints any exception that may
be thrown.  However, if the user of the script enters a line like:

    function ($x = time()) {}

or
    time() = 1

a fatal error is triggered and the script ends.

Those errors should be `CompileError`s instead of fatal errors.  That
would make it possible for the script to catch those errors, print
them and continue running.

In `Zend/zend_compile.c` there are other instances of similar errors
(fatal errors that should be `CompileError`s).

Test script:
---------------
while (($line = readline("> ")) !== FALSE) {
    try {
        var_export(eval("return $line;"));
    } catch (Throwable $exception) {
        echo $exception;
    }
    echo "\n";
}