From d3324b42fa996bcf4b5a532086c0777153679e04 Mon Sep 17 00:00:00 2001
From: Matthew Brown <github@muglug.com>
Date: Wed, 9 Jan 2019 08:49:02 -0500
Subject: [PATCH] Remove slashes from is_a and is_subclass_of string classes,
 and scan them

---
 src/Psalm/Internal/Codebase/Scanner.php         |  4 ++++
 src/Psalm/Internal/Visitor/ReflectorVisitor.php | 11 +++++++++++
 2 files changed, 15 insertions(+)

diff --git a/src/Psalm/Internal/Codebase/Scanner.php b/src/Psalm/Internal/Codebase/Scanner.php
index c1061b93a..5cbe3c385 100644
--- a/src/Psalm/Internal/Codebase/Scanner.php
+++ b/src/Psalm/Internal/Codebase/Scanner.php
@@ -274,6 +274,10 @@ class Scanner
         $analyze_too = false,
         $store_failure = true
     ) {
+        if ($fq_classlike_name[0] === '\\') {
+            $fq_classlike_name = substr($fq_classlike_name, 1);
+        }
+
         $fq_classlike_name_lc = strtolower($fq_classlike_name);
 
         // avoid checking classes that we know will just end in failure
diff --git a/src/Psalm/Internal/Visitor/ReflectorVisitor.php b/src/Psalm/Internal/Visitor/ReflectorVisitor.php
index e65ae12d9..cbaf8bbd2 100644
--- a/src/Psalm/Internal/Visitor/ReflectorVisitor.php
+++ b/src/Psalm/Internal/Visitor/ReflectorVisitor.php
@@ -342,6 +342,17 @@ class ReflectorVisitor extends PhpParser\NodeVisitorAbstract implements PhpParse
                     }
                 }
 
+                if ($function_id === 'is_a' || $function_id === 'is_subclass_of') {
+                    $second_arg = $node->args[1]->value ?? null;
+
+                    if ($second_arg instanceof PhpParser\Node\Scalar\String_) {
+                        $this->codebase->scanner->queueClassLikeForScanning(
+                            $second_arg->value,
+                            $this->file_path
+                        );
+                    }
+                }
+
                 if ($function_id === 'class_alias') {
                     $first_arg = $node->args[0]->value ?? null;
                     $second_arg = $node->args[1]->value ?? null;