Error Identifier: generics.deprecatedTraitDefault

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

/** @deprecated Use NewTrait instead */
trait OldTrait
{
}

/**
 * @template T = OldTrait
 */
class Collection
{
}

Why is it reported? #

The @template tag default value references a trait that is marked as @deprecated. Using deprecated types in generic type defaults propagates the dependency on outdated code to all consumers that rely on the default. This rule is provided by phpstan-deprecation-rules.

How to fix it #

Replace the deprecated trait with its non-deprecated replacement in the template default:

 /**
- * @template T = OldTrait
+ * @template T = NewTrait
  */
 class Collection
 {
 }

How to ignore this error #

You can use the identifier generics.deprecatedTraitDefault to ignore this error using a comment:

// @phpstan-ignore generics.deprecatedTraitDefault
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: generics.deprecatedTraitDefault

Rules that report this error #

PHPStan\Rules\Deprecations\RestrictedDeprecatedClassNameUsageExtension [1] phpstan/phpstan-deprecation-rules

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