Keep the full name of a class a fix writes into a use statement

src/Fixable/NewClassNamesVisitor.php

@@ -376,10 +376,22 @@ private function parsePhpDoc(Doc $doc): PhpDocNode
 
 	/**
 	 * Function and constant names are not class names,
+	 * a use statement imports a name as it is written,
 	 * and `self` is not valid PHP everywhere a class name is.
 	 */
 	private function markNames(Node $node): void
 	{
+		if ($node instanceof Stmt\Use_) {
+			foreach ($node->uses as $useItem) {
+				if (!$useItem->name instanceof FullyQualified || $useItem->name->getAttribute('origNode') !== null) {
+					continue;
+				}
+
+				$useItem->name = new Name($useItem->name->toString());
+			}
+			return;
+		}
+
 		if ($node instanceof Node\Expr\FuncCall || $node instanceof Node\Expr\ConstFetch) {
 			$node->name->setAttribute(self::SKIP_ATTRIBUTE, true);
 			return;

tests/PHPStan/Fixable/RenameUseRule.php

@@ -0,0 +1,41 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Fixable;
+
+use PhpParser\Node;
+use PhpParser\Node\Name\FullyQualified;
+use PHPStan\Analyser\Scope;
+use PHPStan\Rules\Rule;
+use PHPStan\Rules\RuleErrorBuilder;
+
+/**
+ * Replaces the imported RenameUseOther\Foo with a fully qualified RenameUseOther\Bar.
+ *
+ * @implements Rule<Node\Stmt\Use_>
+ */
+final class RenameUseRule implements Rule
+{
+
+	public function getNodeType(): string
+	{
+		return Node\Stmt\Use_::class;
+	}
+
+	public function processNode(Node $node, Scope $scope): array
+	{
+		if ($node->uses[0]->name->toString() !== 'RenameUseOther\Foo') {
+			return [];
+		}
+
+		return [
+			RuleErrorBuilder::message('Import RenameUseOther\Bar.')
+				->identifier('tests.renameUse')
+				->fixNode($node, static function (Node\Stmt\Use_ $use): Node\Stmt\Use_ {
+					$use->uses[0]->name = new FullyQualified('RenameUseOther\Bar');
+					return $use;
+				})
+				->build(),
+		];
+	}
+
+}

tests/PHPStan/Fixable/RenameUseRuleTest.php

@@ -0,0 +1,24 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Fixable;
+
+use PHPStan\Rules\Rule;
+use PHPStan\Testing\RuleTestCase;
+
+/**
+ * @extends RuleTestCase<RenameUseRule>
+ */
+class RenameUseRuleTest extends RuleTestCase
+{
+
+	protected function getRule(): Rule
+	{
+		return new RenameUseRule();
+	}
+
+	public function testFix(): void
+	{
+		$this->fix(__DIR__ . '/data/rename-use.php', __DIR__ . '/data/rename-use.php.fixed');
+	}
+
+}

tests/PHPStan/Fixable/data/rename-use.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types = 1);
+
+namespace RenameUse;
+
+use RenameUseOther\Foo;
+use RenameUseOther\Foo as Lorem;
+
+function doFoo(Foo $foo, Lorem $lorem): void
+{
+}

tests/PHPStan/Fixable/data/rename-use.php.fixed

@@ -0,0 +1,10 @@
+<?php declare(strict_types = 1);
+
+namespace RenameUse;
+
+use RenameUseOther\Bar;
+use RenameUseOther\Bar as Lorem;
+
+function doFoo(Foo $foo, Lorem $lorem): void
+{
+}