Remove the old_rust feature

This feature is no longer needed since we're droppin 1.41 support anyway
and if it ever needs to be reintroduced using a build script is better.

Cargo.toml

@@ -21,7 +21,6 @@ spec = "config_spec.toml"
 
 [features]
 default = ["debug_logs", "systemd"]
-old_rust = []
 debug_logs = ["slog/max_level_debug"]
 systemd = ["systemd_socket/enable_systemd"]
 

src/lib.rs

@@ -1,5 +1,3 @@
-#![cfg_attr(feature = "old_rust", allow(unstable_name_collisions))]
-
 #[macro_use]
 extern crate slog;
 

src/rpc_methods.rs

@@ -5,9 +5,6 @@ use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use crate::client::RpcMethod;
 use crate::util::{Either, HexBytes};
 
-#[cfg(feature = "old_rust")]
-use crate::util::old_rust::StrCompat;
-
 #[derive(Debug)]
 pub struct GetBlock;
 #[derive(Debug, Deserialize, Serialize)]

src/users.rs

@@ -16,9 +16,6 @@ use crate::rpc_methods::{
 };
 use crate::state::State;
 
-#[cfg(feature = "old_rust")]
-use crate::util::old_rust::StrCompat;
-
 pub use password::Password;
 
 pub mod input {

src/util.rs

@@ -58,30 +58,6 @@ pub trait ApplyMut {
 }
 impl<T> ApplyMut for T {}
 
-#[cfg(feature = "old_rust")]
-pub mod old_rust {
-    pub trait StrCompat {
-        fn strip_prefix<'a>(&'a self, prefix: &str) -> Option<&'a str>;
-        fn strip_suffix<'a>(&'a self, suffix: &str) -> Option<&'a str>;
-    }
-    impl StrCompat for str {
-        fn strip_prefix<'a>(&'a self, prefix: &str) -> Option<&'a str> {
-            if let Some(s) = self.matches(prefix).next() {
-                Some(&self[s.len()..])
-            } else {
-                None
-            }
-        }
-        fn strip_suffix<'a>(&'a self, suffix: &str) -> Option<&'a str> {
-            if let Some(s) = self.rmatches(suffix).next() {
-                Some(&self[..(self.len() - s.len())])
-            } else {
-                None
-            }
-        }
-    }
-}
-
 #[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
 #[serde(untagged)]
 pub enum Either<Left, Right> {