Closure basically implements callable

src/Psalm/Checker/ClassChecker.php

@@ -161,6 +161,10 @@ class ClassChecker extends ClassLikeChecker
     {
         $interface_id = strtolower($interface);
 
+        if ($interface_id === 'callable' && $absolute_class === 'Closure') {
+            return true;
+        }
+
         if (isset(self::$class_implements[$absolute_class][$interface_id])) {
             return true;
         }

src/Psalm/Checker/FunctionChecker.php

@@ -302,7 +302,8 @@ class FunctionChecker extends FunctionLikeChecker
                 $function_call_arg = $call_args[$function_index];
 
                 if ($function_call_arg->value instanceof PhpParser\Node\Expr\Closure) {
-                    $closure_return_types = \Psalm\EffectsAnalyser::getReturnTypes($function_call_arg->value->stmts, true);
+                    $closure_yield_types = [];
+                    $closure_return_types = \Psalm\EffectsAnalyser::getReturnTypes($function_call_arg->value->stmts, $closure_yield_types, true);
 
                     if (!$closure_return_types) {
                         if (IssueBuffer::accepts(

src/Psalm/Checker/StatementsChecker.php

@@ -1116,6 +1116,8 @@ class StatementsChecker
 
             $closure_checker->check($use_context, $context->check_methods);
 
+            $stmt->inferredType = Type::getClosure();
+
         } elseif ($stmt instanceof PhpParser\Node\Expr\ArrayDimFetch) {
             if ($this->checkArrayAccess($stmt, $context, $array_assignment, $assignment_key_type, $assignment_value_type, $assignment_key_value) === false) {
                 return false;

src/Psalm/Type.php

@@ -254,6 +254,14 @@ abstract class Type
         return new Union([$type]);
     }
 
+    /** @return Type\Union */
+    public static function getClosure()
+    {
+        $type = new Atomic('Closure');
+
+        return new Union([$type]);
+    }
+
     /** @return Type\Union */
     public static function getArray()
     {

tests/Php70Test.php

@@ -153,10 +153,10 @@ class Php70Test extends PHPUnit_Framework_TestCase
 
     public function testGeneratorWithReturn()
     {
-        $this->markTestIncomplete('Not yet supported');
         $stmts = self::$_parser->parse('<?php
         /**
-         * @return array<int,int>
+         * @return Generator<int,int>
+         * @psalm-generator-return string
          */
         function foo(int $i) : Generator {
             if ($i === 1) {
@@ -170,31 +170,6 @@ class Php70Test extends PHPUnit_Framework_TestCase
         $file_checker = new \Psalm\Checker\FileChecker('somefile.php', $stmts);
         $context = new Context('somefile.php');
         $file_checker->check(true, true, $context);
-        $this->assertEquals('array<int,int>', (string) $context->vars_in_scope['$gen']);
-        $this->assertEquals('int', (string) $context->vars_in_scope['$gen2']);
-    }
-
-    public function testClosureCall()
-    {
-        $this->markTestIncomplete('Not yet supported');
-        $stmts = self::$_parser->parse('<?php
-        class A {private $x = 1;}
-
-        // Pre PHP 7 code
-        $getXCB = function() {return $this->x;};
-        $getX = $getXCB->bindTo(new A, "A"); // intermediate closure
-        $a = $getX();
-
-        // PHP 7+ code
-        $getX = function() {return $this->x;};
-        $b = $getX->call(new A);
-        ');
-
-        $file_checker = new \Psalm\Checker\FileChecker('somefile.php', $stmts);
-        $context = new Context('somefile.php');
-        $file_checker->check(true, true, $context);
-        $this->assertEquals('mixed', (string) $context->vars_in_scope['$a']);
-        $this->assertEquals('mixed', (string) $context->vars_in_scope['$b']);
     }
 
     public function testGeneratorDelegation()
@@ -202,6 +177,7 @@ class Php70Test extends PHPUnit_Framework_TestCase
         $stmts = self::$_parser->parse('<?php
         /**
          * @return Generator<int,int>
+         * @psalm-generator-return int
          */
         function count_to_ten() : Generator {
             yield 1;
@@ -229,6 +205,7 @@ class Php70Test extends PHPUnit_Framework_TestCase
 
         /**
          * @return Generator<int,int>
+         * @psalm-generator-return int
          */
         function nine_ten() : Generator {
             yield 9;