Switch to Rust 2018

Cargo.toml

@@ -3,6 +3,7 @@ authors = ["Erik Johnston"]
 description = "A tool to compress some state in a Synapse instance's database"
 name = "synapse-compress-state"
 version = "0.1.0"
+edition = "2018"
 
 [dependencies]
 clap = "2.32.0"

src/compressor.rs

@@ -33,8 +33,7 @@ use state_map::StateMap;
 use std::collections::BTreeMap;
 use string_cache::DefaultAtom as Atom;
 
-use collapse_state_maps;
-use StateGroupEntry;
+use super::{collapse_state_maps, StateGroupEntry};
 
 /// Holds information about a particular level.
 struct Level {

src/database.rs

@@ -18,7 +18,7 @@ use postgres::{Connection, TlsMode};
 use rand::{distributions::Alphanumeric, thread_rng, Rng};
 use std::{borrow::Cow, collections::BTreeMap, fmt};
 
-use StateGroupEntry;
+use super::StateGroupEntry;
 
 /// Fetch the entries in state_groups_state (and their prev groups) for the
 /// given `room_id` by connecting to the postgres database at `db_url`.
@@ -174,7 +174,7 @@ fn get_missing_from_db(conn: &Connection, missing_sgs: &[i64]) -> BTreeMap<i64,
 pub struct PGEscapse<'a>(pub &'a str);
 
 impl<'a> fmt::Display for PGEscapse<'a> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let mut delim = Cow::from("$$");
         while self.0.contains(&delim as &str) {
             let s: String = thread_rng().sample_iter(&Alphanumeric).take(10).collect();

src/main.rs

@@ -16,17 +16,6 @@
 //! Synapse instance's database. Specifically, it aims to reduce the number of
 //! rows that a given room takes up in the `state_groups_state` table.
 
-#[macro_use]
-extern crate clap;
-extern crate fallible_iterator;
-extern crate indicatif;
-extern crate jemallocator;
-extern crate postgres;
-extern crate rand;
-extern crate rayon;
-extern crate state_map;
-extern crate string_cache;
-
 mod compressor;
 mod database;
 
@@ -36,7 +25,9 @@ static GLOBAL: jemallocator::Jemalloc = jemallocator::Jemalloc;
 use compressor::Compressor;
 use database::PGEscapse;
 
-use clap::{App, Arg};
+use clap::{
+    crate_authors, crate_description, crate_name, crate_version, value_t_or_exit, App, Arg,
+};
 use indicatif::{ProgressBar, ProgressStyle};
 use rayon::prelude::*;
 use state_map::StateMap;