RequireCombinedAssignmentOperatorSniff: Fixed internal error

Author: kukulich

SlevomatCodingStandard/Sniffs/Operators/RequireCombinedAssignmentOperatorSniff.php

@@ -78,9 +78,12 @@ public function process(File $phpcsFile, $equalPointer): void
 
 		/** @var int $beforeEqualEndPointer */
 		$beforeEqualEndPointer = TokenHelper::findPreviousEffective($phpcsFile, $equalPointer - 1);
-		/** @var int $beforeEqualStartPointer */
 		$beforeEqualStartPointer = IdentificatorHelper::findStartPointer($phpcsFile, $beforeEqualEndPointer);
 
+		if ($beforeEqualStartPointer === null) {
+			return;
+		}
+
 		$beforeEqualVariableContent = IdentificatorHelper::getContent($phpcsFile, $beforeEqualStartPointer, $beforeEqualEndPointer);
 
 		if ($beforeEqualVariableContent !== $variableContent) {

tests/Sniffs/Operators/data/requireCombinedAssignmentOperatorNoErrors.php

@@ -27,4 +27,11 @@ public function noVariableAfterAssigment($b, $c)
 	{
 		$a = ($b * $c);
 	}
+
+	public function shortList($array)
+	{
+		[$a, $b, $c, $d, $e] = $array + range(0, 4);
+	}
+
 }
+