Remove need for smartstring/std.

CHANGELOG.md

@@ -8,7 +8,7 @@ Bug fixes
 ---------
 
 * Compiling on 32-bit architectures no longer cause a compilation error.
-* Fix type-size test fo 32-bit architectures without the `decimal` feature.
+* Fix type-size test for 32-bit architectures without the `decimal` feature.
 
 Custom syntax with state
 ------------------------

src/api/files.rs

@@ -108,7 +108,7 @@ impl Engine {
     pub fn compile_file_with_scope(&self, scope: &Scope, path: PathBuf) -> RhaiResultOf<AST> {
         Self::read_file(&path).and_then(|contents| {
             let mut ast = self.compile_with_scope(scope, &contents)?;
-            ast.set_source(path.to_string_lossy());
+            ast.set_source(path.to_string_lossy().as_ref());
             Ok(ast)
         })
     }