Comments (1)
I found these snippets:
https://psalm.dev/r/b4c4f99a60
<?php
/**
* @template T
*/
class Example
{
/** @param T $value */
function __construct(private mixed $value) {}
/** @return T */
function getValue(): mixed
{
return $this->value;
}
/** @param T $value */
function setValue(mixed $value): void
{
$this->value = $value;
}
/**
* @template T2
* @param self<T2> $another
*/
function example(self $another): void
{
/** @psalm-trace $anotherValue */
$anotherValue = $another->getValue();
$another->setValue($anotherValue); // expects T, but should expect T2
}
}
Psalm output (using commit ef3b018):
INFO: Trace - 30:9 - $anotherValue: T2:fn-example::example as mixed
ERROR: InvalidArgument - 32:28 - Argument 1 of Example::setValue expects T:Example as mixed, but T2:fn-example::example as mixed provided
https://psalm.dev/r/a5a7b5ed21
<?php
/**
* @template T
* @psalm-consistent-constructor
* @psalm-consistent-templates
*/
class Collection
{
/** @param list<T> $values */
function __construct(private array $values = [])
{
}
/** @param T $value */
function add(mixed $value): void
{
$this->values[] = $value;
}
/**
* @param positive-int $size
* @return self<static<T>>
*/
function chunk(int $size): self
{
/**
* @var self<static<T>> $chunks
* @psalm-trace $chunks
*/
$chunks = new self();
foreach (\array_chunk($this->values, $size) as $chunk) {
/** @psalm-trace $chunk */
$chunk = new static($chunk);
$chunks->add($chunk); // expects T, but should expect static<T>
}
return $chunks;
}
}
Psalm output (using commit ef3b018):
INFO: Trace - 31:9 - $chunks: Collection<Collection<T:Collection as mixed>&static>
INFO: Trace - 35:13 - $chunk: Collection<T:Collection as mixed>&static
ERROR: InvalidArgument - 37:26 - Argument 1 of Collection::add expects T:Collection as mixed, but Collection<T:Collection as mixed>&static provided
from psalm.
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