Split bug-10862 test into PHP 8.2 and PHP 8.3 variants

Separate version-specific assertions into two test files with
lint version constraints instead of a single file.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phpstan-bot

tests/PHPStan/Analyser/nsrt/bug-10862-php82.php

@@ -0,0 +1,45 @@
+<?php // lint <= 8.2
+
+declare(strict_types = 1);
+
+namespace Bug10862Php82;
+
+use function PHPStan\Testing\assertType;
+
+function () {
+	$a = [];
+	$a[-4] = 1;
+	$a[] = 2;
+
+	assertType('array{-4: 1, 0: 2}', $a); // PHP <=8.2: next key after -4 is 0
+	assertType('array{-4, 0}', array_keys($a));
+};
+
+function () {
+	$a = [];
+	$a[-1] = 'x';
+	$a[] = 'y';
+
+	assertType("array{-1: 'x', 0: 'y'}", $a); // PHP <=8.2: next key after -1 is 0
+	assertType('array{-1, 0}', array_keys($a));
+};
+
+function () {
+	$a = [];
+	$a[-10] = 'a';
+	$a[-5] = 'b';
+	$a[] = 'c';
+
+	assertType("array{-10: 'a', -5: 'b', 0: 'c'}", $a); // PHP <=8.2: next key is 0
+	assertType('array{-10, -5, 0}', array_keys($a));
+};
+
+function () {
+	$a = [];
+	$a[-3] = 'a';
+	$a[5] = 'b';
+	$a[] = 'c';
+
+	assertType("array{-3: 'a', 5: 'b', 6: 'c'}", $a); // positive key dominates
+	assertType('array{-3, 5, 6}', array_keys($a));
+};

tests/PHPStan/Analyser/nsrt/bug-10862.php …HPStan/Analyser/nsrt/bug-10862-php83.phptests/PHPStan/Analyser/nsrt/bug-10862.php renamed to tests/PHPStan/Analyser/nsrt/bug-10862-php83.php tests/PHPStan/Analyser/nsrt/bug-10862.php renamed to tests/PHPStan/Analyser/nsrt/bug-10862-php83.php

@@ -1,8 +1,8 @@
-<?php
+<?php // lint >= 8.3
 
 declare(strict_types = 1);
 
-namespace Bug10862;
+namespace Bug10862Php83;
 
 use function PHPStan\Testing\assertType;