Minor refactor.

README.md

@@ -61,6 +61,7 @@ Protected against attacks
 * [Sand-boxed](https://rhai.rs/book/safety/sandbox.html) - the scripting engine, if declared immutable, cannot mutate the containing environment unless [explicitly permitted](https://rhai.rs/book/patterns/control.html).
 * Rugged - protected against malicious attacks (such as [stack-overflow](https://rhai.rs/book/safety/max-call-stack.html), [over-sized data](https://rhai.rs/book/safety/max-string-size.html), and [runaway scripts](https://rhai.rs/book/safety/max-operations.html) etc.) that may come from untrusted third-party user-land scripts.
 * Track script evaluation [progress](https://rhai.rs/book/safety/progress.html) and manually terminate a script run.
+* Passes Miri.
 
 
 For those who actually want their own language

src/api/call_fn.rs

@@ -178,7 +178,7 @@ impl Engine {
         #[cfg(not(feature = "no_closure"))]
         crate::func::call::ensure_no_data_race(name, &mut args, false)?;
 
-        let result = self.call_script_fn(
+        self.call_script_fn(
             scope,
             global,
             state,
@@ -189,8 +189,6 @@ impl Engine {
             rewind_scope,
             Position::NONE,
             0,
-        );
-
-        result
+        )
     }
 }

src/api/eval.rs

@@ -227,9 +227,9 @@ impl Engine {
             ast.as_ref(),
         ];
         let lib = if lib.first().map(|m: &&Module| m.is_empty()).unwrap_or(true) {
-            &lib[0..0]
+            &[]
         } else {
-            &lib
+            &lib[..]
         };
         self.eval_global_statements(scope, global, &mut state, statements, lib, level)
     }

src/eval/eval_state.rs

@@ -40,7 +40,7 @@ impl EvalState<'_> {
             always_search_scope: false,
             scope_level: 0,
             fn_resolution_caches: StaticVec::new_const(),
-            dummy: PhantomData::default(),
+            dummy: Default::default(),
         }
     }
     /// Get the number of function resolution cache(s) in the stack.

src/optimizer.rs

@@ -9,8 +9,8 @@ use crate::func::hashing::get_hasher;
 use crate::tokenizer::{Span, Token};
 use crate::types::dynamic::AccessMode;
 use crate::{
-    calc_fn_hash, calc_fn_params_hash, combine_hashes, Dynamic, Engine, FnPtr, Position, Scope,
-    StaticVec, AST, INT, INT_BITS,
+    calc_fn_hash, calc_fn_params_hash, combine_hashes, Dynamic, Engine, FnPtr, Identifier,
+    Position, Scope, StaticVec, AST, INT, INT_BITS,
 };
 #[cfg(feature = "no_std")]
 use std::prelude::v1::*;
@@ -46,7 +46,7 @@ struct OptimizerState<'a> {
     /// Has the [`AST`] been changed during this pass?
     changed: bool,
     /// Collection of constants to use for eager function evaluations.
-    variables: StaticVec<(String, AccessMode, Option<Dynamic>)>,
+    variables: StaticVec<(Identifier, AccessMode, Option<Dynamic>)>,
     /// Activate constants propagation?
     propagate_constants: bool,
     /// An [`Engine`] instance for eager function evaluation.
@@ -100,7 +100,7 @@ impl<'a> OptimizerState<'a> {
     #[inline(always)]
     pub fn push_var(
         &mut self,
-        name: impl Into<String>,
+        name: impl Into<Identifier>,
         access: AccessMode,
         value: Option<Dynamic>,
     ) {