avoid std::prelude imports

This also means the panic macro isn't ambiguous so we can drop explicit
panic imports.

Author: cpu

src/alg_tests.rs

@@ -14,8 +14,8 @@
 
 #![allow(clippy::duplicate_mod)]
 
-use std::panic;
-use std::prelude::v1::*;
+use alloc::string::String;
+use alloc::vec::Vec;
 
 use base64::{Engine as _, engine::general_purpose};
 use pki_types::alg_id;

src/cert.rs

@@ -392,11 +392,12 @@ impl<'a> FromDer<'a> for CrlDistributionPoint<'a> {
 
 #[cfg(test)]
 mod tests {
+    #[cfg(feature = "alloc")]
+    use alloc::vec::Vec;
+
     use super::*;
     #[cfg(feature = "alloc")]
     use crate::crl::RevocationReason;
-    use std::panic;
-    use std::prelude::v1::*;
 
     #[test]
     // Note: cert::parse_cert is crate-local visibility, and EndEntityCert doesn't expose the

src/crl/types.rs

@@ -924,8 +924,7 @@ mod tests {
     use std::time::Duration;
 
     use pki_types::CertificateDer;
-    use std::prelude::v1::*;
-    use std::{panic, println};
+    use std::println;
 
     use super::*;
     use crate::cert::Cert;

src/der.rs

@@ -472,7 +472,8 @@ macro_rules! oid {
 #[cfg(test)]
 mod tests {
     use super::DerTypeId;
-    use std::prelude::v1::*;
+    #[cfg(feature = "alloc")]
+    use alloc::vec::Vec;
 
     #[cfg(feature = "alloc")]
     #[test]

src/end_entity.rs

@@ -180,10 +180,11 @@ impl<'a> Deref for EndEntityCert<'a> {
 #[cfg(feature = "alloc")]
 #[cfg(test)]
 mod tests {
+    use alloc::string::ToString;
+
     use super::*;
     use crate::test_utils;
     use crate::test_utils::RCGEN_SIGNATURE_ALG;
-    use std::prelude::v1::*;
 
     // This test reproduces https://github.com/rustls/webpki/issues/167 --- an
     // end-entity cert where the common name is a `PrintableString` rather than

src/test_utils.rs

@@ -1,5 +1,5 @@
-#![cfg(feature = "alloc")]
-use std::prelude::v1::*;
+use alloc::string::String;
+use alloc::vec::Vec;
 
 use rcgen::{CertifiedIssuer, CertifiedKey, Issuer, KeyPair, SigningKey};
 

src/verify_cert.rs

@@ -902,14 +902,16 @@ pub(crate) enum Role {
 
 #[cfg(all(test, feature = "alloc", any(feature = "ring", feature = "aws-lc-rs")))]
 mod tests {
+    use alloc::borrow::ToOwned;
+    use alloc::string::{String, ToString};
+    use std::dbg;
+    use std::slice;
+
     use super::*;
     use crate::test_utils;
     use crate::test_utils::{issuer_params, make_end_entity, make_issuer};
     use crate::trust_anchor::anchor_from_trusted_cert;
     use rcgen::{CertifiedIssuer, Issuer, KeyPair, SigningKey};
-    use std::dbg;
-    use std::prelude::v1::*;
-    use std::slice;
 
     #[test]
     fn roundtrip() {