From 6be9301a26fa6598808b09ea61c11ea4e002a8aa Mon Sep 17 00:00:00 2001
From: Steve Fan <29133953+stevefan1999-personal@users.noreply.github.com>
Date: Thu, 25 Jun 2020 23:24:35 +0800
Subject: [PATCH] re-add core crates packages on no_std which is not imported

---
 src/error.rs                | 3 +++
 src/packages/array_basic.rs | 3 +++
 src/packages/string_more.rs | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/src/error.rs b/src/error.rs
index ce8615ed..9702a7e5 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -5,6 +5,9 @@ use crate::token::Position;
 
 use crate::stdlib::{boxed::Box, char, error::Error, fmt, string::String};
 
+#[cfg(feature = "no_std")]
+use crate::alloc::string::ToString;
+
 /// Error when tokenizing the script text.
 #[derive(Debug, Eq, PartialEq, Clone, Hash)]
 pub enum LexError {
diff --git a/src/packages/array_basic.rs b/src/packages/array_basic.rs
index 59358063..59b297a4 100644
--- a/src/packages/array_basic.rs
+++ b/src/packages/array_basic.rs
@@ -10,6 +10,9 @@ use crate::token::Position;
 
 use crate::stdlib::{any::TypeId, boxed::Box};
 
+#[cfg(feature = "no_std")]
+use crate::alloc::string::ToString;
+
 // Register array utility functions
 fn push<T: Variant + Clone>(list: &mut Array, item: T) -> FuncReturn<()> {
     list.push(Dynamic::from(item));
diff --git a/src/packages/string_more.rs b/src/packages/string_more.rs
index 46805750..73ae6e2d 100644
--- a/src/packages/string_more.rs
+++ b/src/packages/string_more.rs
@@ -10,6 +10,9 @@ use crate::utils::StaticVec;
 #[cfg(not(feature = "no_index"))]
 use crate::engine::Array;
 
+#[cfg(feature = "no_std")]
+use crate::alloc::boxed::Box;
+
 use crate::stdlib::{
     any::TypeId,
     fmt::Display,