speclatively use stdlib to have automatic no_std compatibility

src/error.rs

@@ -3,10 +3,7 @@
 use crate::result::EvalAltResult;
 use crate::token::Position;
 
-use crate::stdlib::{boxed::Box, char, error::Error, fmt, string::String};
-
-#[cfg(feature = "no_std")]
-use crate::alloc::string::ToString;
+use crate::stdlib::{boxed::Box, char, error::Error, fmt, string::{String, ToString}};
 
 /// Error when tokenizing the script text.
 #[derive(Debug, Eq, PartialEq, Clone, Hash)]