UnusedMethodCall

Emitted when --find-dead-code is turned on and Psalm finds a method call whose return value is not used anywhere

<?php

final class A {
    private string $foo;

    public function __construct(string $foo) {
        $this->foo = $foo;
    }

    public function getFoo() : string {
        return $this->foo;
    }
}

$a = new A("hello");
$a->getFoo();

It is also emitted, regardless of --find-dead-code, when the return value of a method annotated with PHP 8.5's #[\NoDiscard] attribute is discarded. Casting the call to (void) intentionally discards the value without triggering the issue.