Remove some unused imports

protobuf-support/src/lexer/lexer_impl.rs

@@ -1,5 +1,4 @@
 use std::char;
-use std::convert::TryFrom;
 use std::num::ParseFloatError;
 use std::num::ParseIntError;
 

protobuf/src/coded_input_stream/buf_read_iter.rs

@@ -446,8 +446,6 @@ mod test_bytes {
 #[cfg(test)]
 mod test {
     use std::io;
-    use std::io::BufRead;
-    use std::io::Read;
 
     use super::*;
 

protobuf/src/message_field.rs

@@ -1,4 +1,3 @@
-use std::default::Default;
 use std::hash::Hash;
 use std::ops::Deref;
 use std::option;

protobuf/src/reflect/field/mod.rs

@@ -563,12 +563,7 @@ pub(crate) enum FieldDescriptorImplRef<'a> {
 
 #[cfg(test)]
 mod test {
-    use std::collections::HashMap;
-
     use crate::descriptor::DescriptorProto;
-    use crate::reflect::ReflectValueBox;
-    use crate::well_known_types::struct_::Struct;
-    use crate::well_known_types::struct_::Value;
     use crate::MessageFull;
 
     #[test]