From 41153473fdfe2523d40acef3e3eac8c45a296a3a Mon Sep 17 00:00:00 2001
From: Matt Brown <github@muglug.com>
Date: Fri, 13 Jan 2017 13:09:52 -0500
Subject: [PATCH] Fix #38 - emit issue for non-array on right too

---
 .../Checker/Statements/ExpressionChecker.php  | 10 ++++++
 tests/BinaryOperationTest.php                 | 31 ++++++++++++++-----
 2 files changed, 34 insertions(+), 7 deletions(-)

diff --git a/src/Psalm/Checker/Statements/ExpressionChecker.php b/src/Psalm/Checker/Statements/ExpressionChecker.php
index a6ccc85b362..5dbd766f464 100644
--- a/src/Psalm/Checker/Statements/ExpressionChecker.php
+++ b/src/Psalm/Checker/Statements/ExpressionChecker.php
@@ -926,6 +926,16 @@ public static function analyzeNonDivArithmenticOp(
                                 )) {
                                     // fall through
                                 }
+                            } elseif (!$right_type_part->isArray()) {
+                                if (IssueBuffer::accepts(
+                                    new InvalidOperand(
+                                        'Cannot add an array to a non-array',
+                                        new CodeLocation($statements_checker->getSource(), $right)
+                                    ),
+                                    $statements_checker->getSuppressedIssues()
+                                )) {
+                                    // fall through
+                                }
                             }
 
                             $result_type = Type::getArray();
diff --git a/tests/BinaryOperationTest.php b/tests/BinaryOperationTest.php
index e92427bc7fe..29358a26640 100644
--- a/tests/BinaryOperationTest.php
+++ b/tests/BinaryOperationTest.php
@@ -30,7 +30,7 @@ public function setUp()
     public function testRegularAddition()
     {
         $stmts = self::$parser->parse('<?php
-        echo 5 + 4;
+        $a = 5 + 4;
         ');
 
         $file_checker = new FileChecker('somefile.php', $this->project_checker, $stmts);
@@ -56,7 +56,7 @@ public function testBadAddition()
     public function testDifferingNumericTypesAdditionInWeakMode()
     {
         $stmts = self::$parser->parse('<?php
-        echo 5 + 4.1;
+        $a = 5 + 4.1;
         ');
 
         $file_checker = new FileChecker('somefile.php', $this->project_checker, $stmts);
@@ -73,7 +73,7 @@ public function testDifferingNumericTypesAdditionInStrictMode()
         Config::getInstance()->strict_binary_operands = true;
 
         $stmts = self::$parser->parse('<?php
-        echo 5 + 4.1;
+        $a = 5 + 4.1;
         ');
 
         $file_checker = new FileChecker('somefile.php', $this->project_checker, $stmts);
@@ -87,7 +87,7 @@ public function testNumericAddition()
         $a = "5";
 
         if (is_numeric($a)) {
-            echo $a + 4;
+            $b = $a + 4;
         }
         ');
 
@@ -99,7 +99,7 @@ public function testNumericAddition()
     public function testConcatenation()
     {
         $stmts = self::$parser->parse('<?php
-        echo "Hey " + "Jude,";
+        $a = "Hey " . "Jude,";
         ');
 
         $file_checker = new FileChecker('somefile.php', $this->project_checker, $stmts);
@@ -110,7 +110,7 @@ public function testConcatenation()
     public function testConcatenationWithNumberInWeakMode()
     {
         $stmts = self::$parser->parse('<?php
-        echo "hi" . 5;
+        $a = "hi" . 5;
         ');
 
         $file_checker = new FileChecker('somefile.php', $this->project_checker, $stmts);
@@ -127,7 +127,24 @@ public function testConcatenationWithNumberInStrictMode()
         Config::getInstance()->strict_binary_operands = true;
 
         $stmts = self::$parser->parse('<?php
-        echo "hi" . 5;
+        $a = "hi" . 5;
+        ');
+
+        $file_checker = new FileChecker('somefile.php', $this->project_checker, $stmts);
+        $context = new Context('somefile.php');
+        $file_checker->visitAndAnalyzeMethods($context);
+    }
+
+    /**
+     * @expectedException \Psalm\Exception\CodeException
+     * @expectedExceptionMessage InvalidOperand
+     */
+    public function testAddArrayToNumber()
+    {
+        Config::getInstance()->strict_binary_operands = true;
+
+        $stmts = self::$parser->parse('<?php
+        $a = [1] + 1;
         ');
 
         $file_checker = new FileChecker('somefile.php', $this->project_checker, $stmts);