<?php

if ($x == $x) {
}

if ($x->m(3) < $x->m(3)) {
}

if ($y[2] - $y[2]) {
}

if ($x == $y) {
}

// See xhpast 0.54 -> 0.55.
return $a->sub->value < $b->sub->value;

$skip_cache = true || $some_complicated_expression;
$skip_cache = $a || $b;
$skip_cache = false && something();
$skip_cache = f();

~~~~~~~~~~
error:3:5
error:6:5
error:9:5
error:18:15
error:20:15