Use no-std-compat to build no-std.

src/plugin.rs

@@ -1,11 +1,13 @@
 //! Module defining macros for developing _plugins_.
 
 pub use crate::fn_native::{CallableFunction, FnCallArgs};
-pub use crate::stdlib::{any::TypeId, boxed::Box, format, mem, string::ToString};
 pub use crate::{
     Dynamic, Engine, EvalAltResult, FnAccess, FnNamespace, ImmutableString, Module,
     NativeCallContext, Position,
 };
+#[cfg(feature = "no_std")]
+use std::prelude::v1::*;
+pub use std::{any::TypeId, mem};
 pub type RhaiResult = Result<Dynamic, Box<EvalAltResult>>;
 
 #[cfg(not(features = "no_module"))]