Add support for no_std

src/lib.rs

@@ -1,3 +1,4 @@
+#![no_std]
 //! **Typed distributed plugin registration.**
 //!
 //! This crate provides a way to set up a plugin registry into which plugins
@@ -94,6 +95,9 @@
 //! There is no guarantee about the order that plugins of the same type are
 //! visited by the iterator. They may be visited in any order.
 
+extern crate alloc;
+use alloc::boxed::Box;
+
 // Not public API.
 #[doc(hidden)]
 pub use ctor::ctor;