Add test cases for compact() support.

Author: illusori

Tests/CodeAnalysis/VariableAnalysisUnitTest.inc

@@ -428,3 +428,13 @@ class ClassWithLateStaticBinding {
         static::some_method(static::CONSTANT, $param);
     }
 }
+
+function function_with_compact($param1, $param2, $param3) {
+    $var1 = 'value1';
+    $var2 = 'value2';
+    $squish1 = compact('var1');
+    $squish2 = compact('var3');
+    $squish3 = compact('param1');
+    $squish4 = compact('var2', 'param3');
+    echo $squish1, $squish2, $squish3, $squish4;
+}

Tests/CodeAnalysis/VariableAnalysisUnitTest.php

@@ -221,6 +221,10 @@ private function _getWarningAndErrorList() {
                 //  method_with_late_static_binding() line (+5)
                 ($base += 5)  => 0,
                 ($base + 2)   => 1,  //  $var
+                //  function_with_compact() line (+7)
+                ($base += 7)  => 0,
+                ($base + 0)   => 1,  //  unused $param2
+                ($base + 4)   => 1,  //  undefined $var3
                );
     }//end _getWarningAndErrorList()