From 3f78082720786ab79d9080a2dd3c6ebb8974a670 Mon Sep 17 00:00:00 2001
From: Matthew Brown <github@muglug.com>
Date: Sat, 10 Aug 2019 09:16:32 -0400
Subject: [PATCH] Fix is_string call

---
 .../Analyzer/Statements/Expression/AssertionFinder.php        | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php b/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php
index da5693bcd0f..b2e6e48853c 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php
@@ -1861,7 +1861,7 @@ protected static function processCustomAssertion(
                             $if_types[$var_id] = [[$prefix . $assertion->rule[0][0]]];
                         }
                     }
-                } elseif (is_string($assertion->var_id)
+                } elseif (\is_string($assertion->var_id)
                     && strpos($assertion->var_id, '$this->') === 0
                     && $expr instanceof PhpParser\Node\Expr\MethodCall
                 ) {
@@ -1910,7 +1910,7 @@ protected static function processCustomAssertion(
                             $if_types[$var_id] = [[$negated_prefix . $assertion->rule[0][0]]];
                         }
                     }
-                } elseif (is_string($assertion->var_id)
+                } elseif (\is_string($assertion->var_id)
                     && strpos($assertion->var_id, '$this->') === 0
                     && $expr instanceof PhpParser\Node\Expr\MethodCall
                 ) {