Fix

Author: VincentLanglet

src/Rules/Arrays/NonexistentOffsetInArrayDimFetchCheck.php

@@ -95,16 +95,12 @@ public function check(
 					$report = true;
 					break;
 				}
-				if ($dimType instanceof UnionType) {
-					foreach ($dimType->getTypes() as $subDimType) {
-						if ($innerType->hasOffsetValueType($subDimType)->no()) {
-							$report = true;
-							break 2;
-						}
-					}
-					continue;
+				if ($dimType instanceof BenevolentUnionType) {
+					$flattenedInnerTypes = [$dimType];
+				} else {
+					$flattenedInnerTypes = TypeUtils::flattenTypes($dimType);
 				}
-				foreach (TypeUtils::flattenTypes($dimType) as $innerDimType) {
+				foreach ($flattenedInnerTypes as $innerDimType) {
 					if ($innerType->hasOffsetValueType($innerDimType)->no()) {
 						$report = true;
 						break 2;

tests/PHPStan/Rules/Arrays/NonexistentOffsetInArrayDimFetchRuleTest.php

@@ -132,7 +132,7 @@ public function testRule(): void
 				312,
 			],
 			[
-				' Offset int|null might not exist on array<string, string>.',
+				'Offset int|null might not exist on array<string, string>.',
 				314,
 			],
 			[