Install psalm as dev, sync scripts updates

vendor/amphp/amp/lib/CallableMaker.php

@@ -0,0 +1,80 @@
+<?php
+
+namespace Amp;
+
+// @codeCoverageIgnoreStart
+if (\PHP_VERSION_ID < 70100) {
+    /** @psalm-suppress DuplicateClass */
+    trait CallableMaker
+    {
+        /** @var \ReflectionClass */
+        private static $__reflectionClass;
+
+        /** @var \ReflectionMethod[] */
+        private static $__reflectionMethods = [];
+
+        /**
+         * Creates a callable from a protected or private instance method that may be invoked by callers requiring a
+         * publicly invokable callback.
+         *
+         * @param string $method Instance method name.
+         *
+         * @return callable
+         *
+         * @psalm-suppress MixedInferredReturnType
+         */
+        private function callableFromInstanceMethod(string $method): callable
+        {
+            if (!isset(self::$__reflectionMethods[$method])) {
+                if (self::$__reflectionClass === null) {
+                    self::$__reflectionClass = new \ReflectionClass(self::class);
+                }
+                self::$__reflectionMethods[$method] = self::$__reflectionClass->getMethod($method);
+            }
+
+            return self::$__reflectionMethods[$method]->getClosure($this);
+        }
+
+        /**
+         * Creates a callable from a protected or private static method that may be invoked by methods requiring a
+         * publicly invokable callback.
+         *
+         * @param string $method Static method name.
+         *
+         * @return callable
+         *
+         * @psalm-suppress MixedInferredReturnType
+         */
+        private static function callableFromStaticMethod(string $method): callable
+        {
+            if (!isset(self::$__reflectionMethods[$method])) {
+                if (self::$__reflectionClass === null) {
+                    self::$__reflectionClass = new \ReflectionClass(self::class);
+                }
+                self::$__reflectionMethods[$method] = self::$__reflectionClass->getMethod($method);
+            }
+
+            return self::$__reflectionMethods[$method]->getClosure();
+        }
+    }
+} else {
+    /** @psalm-suppress DuplicateClass */
+    trait CallableMaker
+    {
+        /**
+         * @deprecated Use \Closure::fromCallable() instead of this method in PHP 7.1.
+         */
+        private function callableFromInstanceMethod(string $method): callable
+        {
+            return \Closure::fromCallable([$this, $method]);
+        }
+
+        /**
+         * @deprecated Use \Closure::fromCallable() instead of this method in PHP 7.1.
+         */
+        private static function callableFromStaticMethod(string $method): callable
+        {
+            return \Closure::fromCallable([self::class, $method]);
+        }
+    }
+} // @codeCoverageIgnoreEnd