Use type alias

src/packages/lang_core.rs

@@ -1,7 +1,7 @@
 use crate::def_package;
 use crate::plugin::*;
 use crate::types::dynamic::Tag;
-use crate::{Dynamic, EvalAltResult, INT};
+use crate::{Dynamic, EvalAltResult, RhaiResultOf, INT};
 #[cfg(feature = "no_std")]
 use std::prelude::v1::*;
 
@@ -21,7 +21,7 @@ mod core_functions {
         value.tag() as INT
     }
     #[rhai_fn(name = "set_tag", set = "tag", return_raw)]
-    pub fn set_tag(value: &mut Dynamic, tag: INT) -> Result<(), Box<EvalAltResult>> {
+    pub fn set_tag(value: &mut Dynamic, tag: INT) -> RhaiResultOf<()> {
         if tag < Tag::MIN as INT {
             Err(EvalAltResult::ErrorArithmetic(
                 format!(