Fix #639 - add scalar to psalm-recognised types

src/Psalm/Type.php

@@ -38,6 +38,7 @@ abstract class Type
         'float' => true,
         'bool' => true,
         'false' => true,
+        'true' => true,
         'object' => true,
         'empty' => true,
         'callable' => true,
@@ -55,6 +56,7 @@ abstract class Type
         'void' => true,
         'self' => true,
         'static' => true,
+        'scalar' => true,
     ];
 
     /**

tests/ReturnTypeTest.php

@@ -507,6 +507,30 @@ class ReturnTypeTest extends TestCase
                         return $arr;
                     }',
             ],
+            'namespacedScalarParamAndReturn' => [
+                '<?php
+                    namespace Foo;
+
+                    /**
+                    * @param scalar $scalar
+                    *
+                    * @return scalar
+                    */
+                    function ($scalar) {
+                      switch(random_int(0, 3)) {
+                        case 0:
+                          return true;
+                        case 1:
+                          return "string";
+                        case 2:
+                          return 2;
+                        case 3:
+                          return 3.0;
+                      }
+
+                      return 0;
+                    }'
+            ],
         ];
     }