From 2c2f1abb9a32738070309cd654afdf0622756032 Mon Sep 17 00:00:00 2001
From: Jorge Aparicio <jorge.aparicio@ferrous-systems.com>
Date: Thu, 2 Nov 2023 15:42:00 +0100
Subject: [PATCH] switch from std::prelude to core::prelude

to make all non-core imports explicit
---
 src/lib.rs     | 7 ++++++-
 src/pemfile.rs | 6 +++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index a560635..b948f54 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -40,6 +40,11 @@
     unused_extern_crates,
     unused_qualifications
 )]
+#![cfg_attr(not(test), no_std)]
+
+extern crate alloc;
+#[cfg(not(test))]
+extern crate std;
 
 #[cfg(test)]
 mod tests;
@@ -53,9 +58,9 @@ use pki_types::{
     PrivateSec1KeyDer,
 };
 
+use core::iter;
 /// --- Legacy APIs:
 use std::io;
-use std::iter;
 
 /// Return an iterator over certificates from `rd`.
 ///
diff --git a/src/pemfile.rs b/src/pemfile.rs
index 476f220..e4ae5a1 100644
--- a/src/pemfile.rs
+++ b/src/pemfile.rs
@@ -1,5 +1,9 @@
+use alloc::borrow::ToOwned;
+use alloc::format;
+use alloc::string::String;
+use alloc::vec::Vec;
+use core::iter;
 use std::io::{self, ErrorKind};
-use std::iter;
 
 use pki_types::{
     CertificateDer, CertificateRevocationListDer, PrivatePkcs1KeyDer, PrivatePkcs8KeyDer,