run hhast-migrate --ref-to-inout

src/BaseCodeBuilder.hack

@@ -132,7 +132,7 @@ abstract class BaseCodeBuilder {
 
     // break into lines and add one by one to handle indentation
     $lines = Str\split($code, "\n");
-    $last_line = \array_pop(&$lines);
+    $last_line = \array_pop(inout $lines);
     foreach ($lines as $line) {
       $this->addLine($line);
     }

src/HackfmtFormatter.hack

@@ -35,8 +35,8 @@ final class HackfmtFormatter implements ICodegenFormatter {
       \file_put_contents($tempnam, $code);
       \exec(
         'hackfmt '.$options.' '.\escapeshellarg($tempnam),
-        &$output,
-        &$exit_code,
+        inout $output,
+        inout $exit_code,
       );
     } finally {
       \unlink($tempnam);

src/_Private/Vec.hack

@@ -23,6 +23,6 @@ function pop_backx<T>(inout Container<T> $list): T {
     "%s called, but container is empty",
     __FUNCTION__,
   );
-  $last = \array_pop(&$list);
+  $last = \array_pop(inout $list);
   return $last;
 }