Add #[cold] tags.

src/packages/arithmetic.rs

@@ -9,7 +9,8 @@ use std::prelude::v1::*;
 #[cfg(not(feature = "no_float"))]
 use num_traits::Float;
 
-#[inline]
+#[cold]
+#[inline(never)]
 pub fn make_err(msg: impl Into<String>) -> RhaiError {
     ERR::ErrorArithmetic(msg.into(), Position::NONE).into()
 }

src/packages/mod.rs

@@ -120,11 +120,9 @@ pub trait Package {
 ///
 /// def_package! {
 ///     /// My super-duper package.
-///     pub MyPackage(module @ 10) {
+///     pub MyPackage(module) {
 ///         // Load a native Rust function.
 ///         module.set_native_fn("my_add", add);
-///     } |> |engine| {
-///         engine.register_custom_operator("@", 160).unwrap();
 ///     }
 /// }
 /// ```