Comments (1)
I found these snippets:
https://psalm.dev/r/8a5261da42
<?php
/** @template TKey */
final class Collection
{
/** @param array<TKey, mixed> $items */
function __construct(array $items) {}
}
/** @param Collection<int> $c */
function usesIntCollection(Collection $c): void {
echo var_export($c, true); // irrelevant
}
// ok
$empty = new Collection([]);
/** @psalm-trace $empty */
usesIntCollection($empty);
// ok
$keysInferredAsUnionType = new Collection([1 => 'a', 2 => 'b']);
/** @psalm-trace $keysInferredAsUnionType */
usesIntCollection($keysInferredAsUnionType);
$keysInferredAsRange = new Collection(['a', 'b']);
/** @psalm-trace $keysInferredAsRange */
usesIntCollection($keysInferredAsRange);
Psalm output (using commit 16b24bd):
INFO: Trace - 18:1 - $empty: Collection<int>
INFO: Trace - 24:1 - $keysInferredAsUnionType: Collection<int>
ERROR: InvalidArgument - 29:19 - Argument 1 of usesIntCollection expects Collection<int>, but Collection<int<0, 1>> provided
INFO: Trace - 29:1 - $keysInferredAsRange: Collection<int<0, 1>>
from psalm.
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from psalm.