1_hhast-lint.json

{
  "roots": [
    "vendor/"
  ],
  "builtinLinters": "none",
  "overrides": [
    {
      "patterns": [
        "*"
      ],
      "extraLinters": [
        "Facebook\\HHAST\\UnusedVariableLinter"
      ]
    }
  ]
}

2_bin_hhast-lint.log

{
  "passed": false,
  "errors": [
    {
      "path": ".../hhast/vendor/facebook/fbexpect/src/ExpectObj.hack",
      "range": {
        "start": {
          "line": 589,
          "character": 8
        },
        "end": {
          "line": 589,
          "character": 12
        }
      },
      "message": "Variable is unused",
      "linter": "UnusedVariable"
    },
    {
      "path": ".../hhast/vendor/facebook/difflib/src/cluster.php",
      "range": {
        "start": {
          "line": 24,
          "character": 2
        },
        "end": {
          "line": 24,
          "character": 8
        }
      },
      "message": "Variable is unused",
      "linter": "UnusedVariable"
    },
    {
      "path": ".../hhast/vendor/facebook/hack-codegen/src/PartiallyGeneratedCode.hack",
      "range": {
        "start": {
          "line": 129,
          "character": 56
        },
        "end": {
          "line": 129,
          "character": 64
        }
      },
      "message": "Variable is unused",
      "linter": "UnusedVariable"
    },
    {
      "path": ".../hhast/vendor/facebook/hack-codegen/src/PartiallyGeneratedCode.hack",
      "range": {
        "start": {
          "line": 144,
          "character": 4
        },
        "end": {
          "line": 144,
          "character": 11
        }
      },
      "message": "Variable is unused",
      "linter": "UnusedVariable"
    },
    {
      "path": ".../hhast/vendor/facebook/hack-codegen/src/PartiallyGeneratedCode.hack",
      "range": {
        "start": {
          "line": 151,
          "character": 4
        },
        "end": {
          "line": 151,
          "character": 11
        }
      },
      "message": "Variable is unused",
      "linter": "UnusedVariable"
    },
    {
      "path": ".../hhast/vendor/facebook/hh-clilib/src/CLIBase.hack",
      "range": {
        "start": {
          "line": 213,
          "character": 4
        },
        "end": {
          "line": 213,
          "character": 16
        }
      },
      "message": "Variable is unused",
      "linter": "UnusedVariable"
    }
  ]
}

3_bin_hhast-lint.txt

hhast git:(unused_variables) ✗ bin/hhast-lint                         
Variable is unused
  Linter: Facebook\HHAST\UnusedVariableLinter
  Location: /Users/greenberg/code/hhast/vendor/facebook/fbexpect/src/ExpectObj.hack:589:8
@@ -586,7 +586,7 @@
       $returned = \call_user_func_array($callable, $args);
 
       if ($returned is Awaitable<_>) {
-        $ret = \HH\Asio\join($returned);
+        $_ret = \HH\Asio\join($returned);
       }
     } catch (\Exception $e) {
       $e = expect($e)->toBeInstanceOf(
Would you like to apply this fix?
  [y]es/[n]o/yes to [a]ll/n[o] to all: o
Variable is unused
  Linter: Facebook\HHAST\UnusedVariableLinter
  Location: /Users/greenberg/code/hhast/vendor/facebook/difflib/src/cluster.php:24:2
@@ -21,7 +21,7 @@
   vec<DiffOp<T>> $diff,
 ): vec<DiffOp<vec<T>>> {
   $clusters = vec[];
-  $limit = C\count($diff);
+  $_limit = C\count($diff);
   while (!C\is_empty($diff)) {
     $class = $diff[0]->getDiffOpClass();
 
Would you like to apply this fix?
  <no to all>
Variable is unused
  Linter: Facebook\HHAST\UnusedVariableLinter
  Location: /Users/greenberg/code/hhast/vendor/facebook/hack-codegen/src/PartiallyGeneratedCode.hack:129:56
@@ -126,7 +126,7 @@
    * manual sections, duplicated ids, etc)
    */
   public function assertValidManualSections(): void {
-    foreach ($this->iterateCodeSections($this->code) as $section) {
+    foreach ($this->iterateCodeSections($this->code) as $_section) {
     }
   }
 
Would you like to apply this fix?
  <no to all>
Variable is unused
  Linter: Facebook\HHAST\UnusedVariableLinter
  Location: /Users/greenberg/code/hhast/vendor/facebook/hack-codegen/src/PartiallyGeneratedCode.hack:144:4
@@ -141,7 +141,7 @@
     string $code,
   ): \Generator<int, (?string, string), void> {
     // Regular expression to match the beginning of a manual section
-    $quoted = \preg_quote(self::$manualBegin, '/');
+    $_quoted = \preg_quote(self::$manualBegin, '/');
     $begin = self::getBeginManualSectionRegex('(.*)');
     $valid_begin = self::getBeginManualSectionRegex('([A-Za-z0-9:_]+)');
 
Would you like to apply this fix?
  <no to all>
Variable is unused
  Linter: Facebook\HHAST\UnusedVariableLinter
  Location: /Users/greenberg/code/hhast/vendor/facebook/hack-codegen/src/PartiallyGeneratedCode.hack:151:4
@@ -148,7 +148,7 @@
     $seen_ids = keyset[];
     $current_id = null;
     $chunk = array();
-    $manual = array();
+    $_manual = array();
     $lines = \explode("\n", $code);
     foreach ($lines as $line) {
       if (\strpos($line, self::$manualEnd) !== false) {
Would you like to apply this fix?
  <no to all>
Variable is unused
  Linter: Facebook\HHAST\UnusedVariableLinter
  Location: /Users/greenberg/code/hhast/vendor/facebook/hh-clilib/src/CLIBase.hack:213:4
@@ -210,7 +210,7 @@
     // Ignore process name in $argv[0]
     $argv = Vec\drop($argv, 1);
 
-    $not_options = vec[];
+    $_not_options = vec[];
 
     $options = $this->getSupportedOptions();
 
Would you like to apply this fix?
  <no to all>