Allow newlines in arrow functions (#301)

* Add test for arrow func with newlines

* Allow newlines in arrow functions

* Add test for new class in arrow function

* Add some more arrow function tests

Author: sirbrillig

Tests/VariableAnalysisSniff/ArrowFunctionTest.php

@@ -32,6 +32,7 @@ public function testArrowFunctions()
 			87,
 			102,
 			112,
+			150,
 		];
 		$this->assertSame($expectedWarnings, $lines);
 	}
@@ -64,6 +65,7 @@ public function testArrowFunctionsWithoutUnusedBeforeUsed()
 			87,
 			102,
 			112,
+			150,
 		];
 		$this->assertSame($expectedWarnings, $lines);
 	}

Tests/VariableAnalysisSniff/fixtures/ArrowFunctionFixture.php

@@ -127,3 +127,42 @@ function arrowFunctionWithReturnType() {
     $type = do_something(fn(string $func): string => $func ? $func : '');
     echo $type;
 }
+
+function arrowFunctionWithNewlines( $items ): array {
+  return $items
+    ->map(
+      fn ( array $item ) => apply_overrides(
+        [
+          'a' => ! empty( $item['b'] ),
+        ],
+        $item,
+      )
+    )
+    ->filter( fn ( array $item ) => ! empty( $item['post'] ) )
+    ->values()
+    ->all();
+}
+
+function arrowFunctionWithNewClass(): array {
+  $arrow = fn($a) => new class($a) {
+    public function __construct($key) {
+      $this->key = $key;
+      echo $bar; // undefined variable $bar
+    }
+  };
+  echo $arrow;
+}
+
+function arrowFunctionWithQuotes($allowedReferrers) {
+  array_map(
+    static fn (string $allowedReferrer) => str_replace(
+      ['\*\*', '\*'],
+      ['[a-z\d.-]{0,63}', '[a-z\d-]{0,63}'],
+      preg_quote($allowedReferrer, '~'),
+    ),
+    $allowedReferrers;
+  do_something(
+    static fn (string $permissionName) => Str::startsWith($permissionName, CONFIG_START)
+    && $permissionName !== CustomPermission::ALL_CONFIG
+  );
+}

VariableAnalysis/Lib/Helpers.php

@@ -665,11 +665,6 @@ public static function getArrowFunctionOpenClose(File $phpcsFile, $stackPtr)
 				break;
 			}
 
-			// A line break is always a closer.
-			if ($token['line'] !== $tokens[$stackPtr]['line']) {
-				$scopeCloserIndex = $index;
-				break;
-			}
 			$code = $token['code'];
 
 			// A semicolon is always a closer.