From aea5ec50c984d0badfb773492941980be7177a71 Mon Sep 17 00:00:00 2001
From: Stephen Chung <schungx@live.com>
Date: Thu, 11 Feb 2021 21:46:11 +0800
Subject: [PATCH] Fix no-std build.

---
 src/ast.rs                   | 3 +++
 src/packages/string_basic.rs | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/src/ast.rs b/src/ast.rs
index bcfd7e70..77c001ff 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -1176,6 +1176,9 @@ impl fmt::Debug for FloatWrapper {
 #[cfg(not(feature = "no_float"))]
 impl fmt::Display for FloatWrapper {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        #[cfg(feature = "no_std")]
+        use num_traits::Float;
+
         let abs = self.0.abs();
         if abs > 10000000000000.0 || abs < 0.0000000000001 {
             write!(f, "{:e}", self.0)
diff --git a/src/packages/string_basic.rs b/src/packages/string_basic.rs
index 6488e8c1..1442a161 100644
--- a/src/packages/string_basic.rs
+++ b/src/packages/string_basic.rs
@@ -83,6 +83,9 @@ fn to_debug<T: Debug>(x: &mut T) -> ImmutableString {
 }
 #[cfg(not(feature = "no_float"))]
 fn print_f64(x: &mut f64) -> ImmutableString {
+    #[cfg(feature = "no_std")]
+    use num_traits::Float;
+
     let abs = x.abs();
     if abs > 10000000000000.0 || abs < 0.0000000000001 {
         format!("{:e}", x).into()
@@ -92,6 +95,9 @@ fn print_f64(x: &mut f64) -> ImmutableString {
 }
 #[cfg(not(feature = "no_float"))]
 fn print_f32(x: &mut f32) -> ImmutableString {
+    #[cfg(feature = "no_std")]
+    use num_traits::Float;
+
     let abs = x.abs();
     if abs > 10000000000000.0 || abs < 0.0000000000001 {
         format!("{:e}", x).into()