Fix BackedEnum::from() and tryFrom() methods

Author: ondrejmirtes

src/Reflection/SignatureMap/Php8SignatureMapProvider.php

@@ -50,6 +50,9 @@ public function __construct(
 	public function hasMethodSignature(string $className, string $methodName, int $variant = 0): bool
 	{
 		$lowerClassName = strtolower($className);
+		if ($lowerClassName === 'backedenum') {
+			return false;
+		}
 		if (!array_key_exists($lowerClassName, $this->map->classes)) {
 			return $this->functionSignatureMapProvider->hasMethodSignature($className, $methodName, $variant);
 		}

tests/PHPStan/Analyser/NodeScopeResolverTest.php

@@ -896,6 +896,7 @@ public function dataFileAsserts(): iterable
 		}
 
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-7068.php');
+		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-7096.php');
 	}
 
 	/**

tests/PHPStan/Analyser/data/bug-7096.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Bug7096;
+
+use function PHPStan\Testing\assertType;
+
+class Foo
+{
+
+	/**
+	 * @param class-string<\BackedEnum> $enumClass
+	 */
+	function enumFromString(string $enumClass, string|int $value): void
+	{
+		assertType(\BackedEnum::class, $enumClass::from($value));
+		assertType(\BackedEnum::class . '|null', $enumClass::tryFrom($value));
+	}
+
+	function customStaticMethod(): static
+	{
+		return new static();
+	}
+
+	/**
+	 * @param class-string<self> $class
+	 */
+	function test(string $class): void
+	{
+		assertType(self::class, $class::customStaticMethod());
+	}
+
+}