Make all public API's return Box<EvalAltResult> to reduce footprint.

examples/custom_types_and_methods.rs

@@ -16,7 +16,7 @@ impl TestStruct {
 }
 
 #[cfg(not(feature = "no_object"))]
-fn main() -> Result<(), EvalAltResult> {
+fn main() -> Result<(), Box<EvalAltResult>> {
     let mut engine = Engine::new();
 
     engine.register_type::<TestStruct>();

examples/hello.rs

@@ -1,7 +1,7 @@
 use rhai::{packages::*, Engine, EvalAltResult, INT};
 use std::rc::Rc;
 
-fn main() -> Result<(), EvalAltResult> {
+fn main() -> Result<(), Box<EvalAltResult>> {
     let mut engine = Engine::new_raw();
     engine.load_package(ArithmeticPackage::new().get());
 

examples/no_std.rs

@@ -2,7 +2,7 @@
 
 use rhai::{Engine, EvalAltResult, INT};
 
-fn main() -> Result<(), EvalAltResult> {
+fn main() -> Result<(), Box<EvalAltResult>> {
     let engine = Engine::new();
 
     let result = engine.eval::<INT>("40 + 2")?;

examples/repl.rs

@@ -157,7 +157,7 @@ fn main() {
             Ok(_) => (),
             Err(err) => {
                 println!();
-                print_error(&input, err);
+                print_error(&input, *err);
                 println!();
             }
         }

examples/reuse_scope.rs

@@ -1,6 +1,6 @@
 use rhai::{Engine, EvalAltResult, Scope, INT};
 
-fn main() -> Result<(), EvalAltResult> {
+fn main() -> Result<(), Box<EvalAltResult>> {
     let engine = Engine::new();
     let mut scope = Scope::new();
 

examples/rhai_runner.rs

@@ -72,7 +72,7 @@ fn main() {
             eprintln!("{:=<1$}", "", filename.len());
             eprintln!("");
 
-            eprint_error(&contents, err);
+            eprint_error(&contents, *err);
         }
     }
 }

examples/simple_fn.rs

@@ -1,6 +1,6 @@
 use rhai::{Engine, EvalAltResult, RegisterFn, INT};
 
-fn main() -> Result<(), EvalAltResult> {
+fn main() -> Result<(), Box<EvalAltResult>> {
     let mut engine = Engine::new();
 
     fn add(x: INT, y: INT) -> INT {