chore: fix unused_import lints

prost-derive/src/field/scalar.rs

@@ -1,4 +1,3 @@
-use std::convert::TryFrom;
 use std::fmt;
 
 use anyhow::{anyhow, bail, Error};

src/encoding.rs

@@ -9,7 +9,6 @@ use alloc::format;
 use alloc::string::String;
 use alloc::vec::Vec;
 use core::cmp::min;
-use core::convert::TryFrom;
 use core::mem;
 use core::str;
 use core::u32;
@@ -1423,15 +1422,16 @@ pub mod btree_map {
 
 #[cfg(test)]
 mod test {
+    #[cfg(not(feature = "std"))]
     use alloc::string::ToString;
     use core::borrow::Borrow;
     use core::fmt::Debug;
     use core::u64;
 
-    use ::bytes::{Bytes, BytesMut};
+    use ::bytes::BytesMut;
     use proptest::{prelude::*, test_runner::TestCaseResult};
 
-    use crate::encoding::*;
+    use super::*;
 
     pub fn check_type<T, B>(
         value: T,

src/error.rs

@@ -1,7 +1,9 @@
 //! Protobuf encoding and decoding errors.
 
 use alloc::borrow::Cow;
+#[cfg(not(feature = "std"))]
 use alloc::boxed::Box;
+#[cfg(not(feature = "std"))]
 use alloc::vec::Vec;
 
 use core::fmt;

src/message.rs

@@ -1,8 +1,9 @@
+#[cfg(not(feature = "std"))]
 use alloc::boxed::Box;
+#[cfg(not(feature = "std"))]
 use alloc::vec::Vec;
 
 use core::fmt::Debug;
-use core::usize;
 
 use bytes::{Buf, BufMut};
 

src/name.rs

@@ -1,6 +1,8 @@
 //! Support for associating type name information with a [`Message`].
 
 use crate::Message;
+
+#[cfg(not(feature = "std"))]
 use alloc::{format, string::String};
 
 /// Associate a type name with a [`Message`] type.

src/types.rs

@@ -5,7 +5,9 @@
 //! the `prost-types` crate in order to avoid a cyclic dependency between `prost` and
 //! `prost-build`.
 
+#[cfg(not(feature = "std"))]
 use alloc::string::String;
+#[cfg(not(feature = "std"))]
 use alloc::vec::Vec;
 
 use ::bytes::{Buf, BufMut, Bytes};

tests/src/debug.rs

@@ -3,7 +3,9 @@
 //! The tests check against expected output. This may be a bit fragile, but it is likely OK for
 //! actual use.
 
-use prost::alloc::{format, string::String};
+use prost::alloc::format;
+#[cfg(not(feature = "std"))]
+use prost::alloc::string::String;
 
 // Borrow some types from other places.
 #[cfg(feature = "std")]

tests/src/deprecated_field.rs

@@ -1,3 +1,4 @@
+#[cfg(not(feature = "std"))]
 use alloc::string::ToString;
 
 mod deprecated_field {

tests/src/lib.rs

@@ -138,6 +138,7 @@ pub mod default_string_escape {
     include!(concat!(env!("OUT_DIR"), "/default_string_escape.rs"));
 }
 
+#[cfg(not(feature = "std"))]
 use alloc::vec::Vec;
 
 use anyhow::anyhow;
@@ -278,11 +279,10 @@ where
 #[cfg(test)]
 mod tests {
 
-    use alloc::borrow::ToOwned;
-    use alloc::boxed::Box;
     use alloc::collections::{BTreeMap, BTreeSet};
-    use alloc::string::ToString;
     use alloc::vec;
+    #[cfg(not(feature = "std"))]
+    use alloc::{borrow::ToOwned, boxed::Box, string::ToString};
 
     use super::*;
 

tests/src/message_encoding.rs

@@ -1,4 +1,7 @@
-use prost::alloc::{borrow::ToOwned, string::String, vec, vec::Vec};
+use prost::alloc::vec;
+#[cfg(not(feature = "std"))]
+use prost::alloc::{borrow::ToOwned, string::String, vec::Vec};
+
 use prost::bytes::Bytes;
 use prost::{Enumeration, Message, Oneof};
 

tests/src/skip_debug.rs

@@ -1,9 +1,13 @@
 //! Tests for skipping the default Debug implementation.
 
+use std::fmt;
+
+use prost::alloc::format;
+#[cfg(not(feature = "std"))]
+use prost::alloc::string::String;
+
 use crate::custom_debug::{msg, AnEnum, Msg};
 use crate::message_encoding::BasicEnumeration;
-use prost::alloc::{format, string::String};
-use std::fmt;
 
 /// A special case with a tuple struct
 #[test]