ci: fix warnings, check minimal featureset

Author: blackbeam

azure-pipelines.yml

@@ -45,6 +45,9 @@ jobs:
           SSL=false COMPRESS=true cargo test
           SSL=true COMPRESS=true cargo test
           SSL=true COMPRESS=false cargo test --no-default-features --features default-rustls
+
+          SSL=true COMPRESS=false cargo check --no-default-features --features minimal
+          SSL=true COMPRESS=false cargo check --no-default-features --features minimal-rust
         env:
           RUST_BACKTRACE: 1
           DATABASE_URL: mysql://root:[email protected]:3306/mysql

src/conn/pool/mod.rs

@@ -14,7 +14,6 @@ use std::{
     borrow::Borrow,
     cmp::Reverse,
     collections::VecDeque,
-    convert::TryFrom,
     hash::{Hash, Hasher},
     str::FromStr,
     sync::{atomic, Arc, Mutex},

src/queryable/mod.rs

@@ -587,7 +587,6 @@ impl Queryable for Transaction<'_> {
 
 #[cfg(test)]
 mod tests {
-    use super::Queryable;
     use crate::{error::Result, prelude::*, test_misc::get_opts, Conn};
 
     #[tokio::test]