diff --git a/src/lint/engine/ArcanistLintEngine.php b/src/lint/engine/ArcanistLintEngine.php
--- a/src/lint/engine/ArcanistLintEngine.php
+++ b/src/lint/engine/ArcanistLintEngine.php
@@ -300,6 +300,7 @@
               if ($linter->didStopAllLinters()) {
                 $this->stopped[$path] = $linter_name;
               }
+              $linter->didLintPath($path);
             }
           } catch (Exception $ex) {
             $profiler->endServiceCall($call_id, array());
diff --git a/src/lint/linter/ArcanistBaseXHPASTLinter.php b/src/lint/linter/ArcanistBaseXHPASTLinter.php
--- a/src/lint/linter/ArcanistBaseXHPASTLinter.php
+++ b/src/lint/linter/ArcanistBaseXHPASTLinter.php
@@ -107,6 +107,7 @@
    * @task sharing
    */
   protected function getXHPASTTreeForPath($path) {
+    echo "getXHPASTTreeForPath: {$path}\n";
 
     // If we aren't the linter responsible for actually building the parse
     // trees, go get the tree from that linter.
@@ -147,5 +148,12 @@
     return idx($this->exceptions, $path);
   }
 
+  public function didLintPath($path) {
+    echo "didLintPath: {$path}\n";
+    if (idx($this->trees, $path)) {
+      unset($this->trees[$path]);
+    }
+  }
+
 
 }
diff --git a/src/lint/linter/ArcanistFutureLinter.php b/src/lint/linter/ArcanistFutureLinter.php
--- a/src/lint/linter/ArcanistFutureLinter.php
+++ b/src/lint/linter/ArcanistFutureLinter.php
@@ -26,6 +26,7 @@
       foreach ($this->futures as $path => $future) {
         $this->willLintPath($path);
         $this->resolveFuture($path, $future);
+        $this->didLintPath($path);
       }
     }
   }
diff --git a/src/lint/linter/ArcanistLinter.php b/src/lint/linter/ArcanistLinter.php
--- a/src/lint/linter/ArcanistLinter.php
+++ b/src/lint/linter/ArcanistLinter.php
@@ -305,6 +305,10 @@
     return;
   }
 
+  public function didLintPath($path) {
+    // This is a hook.
+  }
+
   abstract public function lintPath($path);
   abstract public function getLinterName();