ReturnTypeHintSniff: Fixed false positive

Author: kukulich

SlevomatCodingStandard/Sniffs/TypeHints/ReturnTypeHintSniff.php

@@ -202,10 +202,16 @@ private function checkFunctionTypeHint(
 					continue;
 				}
 
+				$isTraversable = TypeHintHelper::isTraversableType(TypeHintHelper::getFullyQualifiedTypeHint($phpcsFile, $functionPointer, $typeHint), $this->getTraversableTypeHints());
+
+				if (!$isTraversable && count($traversableTypeHints) > 0) {
+					return;
+				}
+
 				if (
 					!$typeNode instanceof ArrayTypeNode
 					&& !$typeNode instanceof ArrayShapeNode
-					&& TypeHintHelper::isTraversableType(TypeHintHelper::getFullyQualifiedTypeHint($phpcsFile, $functionPointer, $typeHint), $this->getTraversableTypeHints())
+					&& $isTraversable
 				) {
 					$traversableTypeHints[] = $typeHint;
 				}

tests/Sniffs/TypeHints/data/returnTypeHintNoErrors.php

@@ -200,4 +200,11 @@ public function moreTraverasableTypes()
 	{
 	}
 
+	/**
+	 * @return mixed[]|array|SomethingThatLooksAsArray
+	 */
+	public function moreDifferentTypes()
+	{
+	}
+
 }