fix up more single_component_path_imports clippy lints

src/rust/engine/engine_cffi/build.rs

@@ -25,9 +25,6 @@
 // Arc<Mutex> can be more clear than needing to grok Orderings:
 #![allow(clippy::mutex_atomic)]
 
-use cbindgen;
-use cc;
-
 /*
 We use the `gcc` crate to compile the CFFI C sources (`native_engine.c`)
 generated by `bootstrap.sh` into a (private) static lib (`libnative_engine_ffi.a`),

src/rust/engine/process_executor/src/main.rs

@@ -25,11 +25,6 @@
 // Arc<Mutex> can be more clear than needing to grok Orderings:
 #![allow(clippy::mutex_atomic)]
 
-use clap;
-use env_logger;
-
-use process_execution;
-
 use clap::{value_t, App, AppSettings, Arg};
 use futures::compat::Future01CompatExt;
 use hashing::{Digest, Fingerprint};

src/rust/engine/src/context.rs

@@ -1,7 +1,6 @@
 // Copyright 2017 Pants project contributors (see CONTRIBUTORS.md).
 // Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-use std;
 use std::collections::{BTreeMap, HashSet};
 use std::convert::{Into, TryInto};
 use std::ops::Deref;
@@ -29,7 +28,6 @@ use process_execution::{
   self, speculate::SpeculatingCommandRunner, BoundedCommandRunner, Platform, ProcessMetadata,
 };
 use rand::seq::SliceRandom;
-use reqwest;
 use rule_graph::RuleGraph;
 use sharded_lmdb::ShardedLmdb;
 use store::Store;

src/rust/engine/src/core.rs

@@ -10,7 +10,6 @@ use std::{fmt, hash};
 use crate::externs;
 use crate::handles::Handle;
 
-use rule_graph;
 use smallvec::{smallvec, SmallVec};
 
 pub type FNV = hash::BuildHasherDefault<FnvHasher>;

src/rust/engine/src/intrinsics.rs

@@ -7,10 +7,8 @@ use crate::tasks::Intrinsic;
 use crate::types::Types;
 
 use boxfuture::Boxable;
-use bytes;
 use futures::future::{self as future03, TryFutureExt};
 use futures01::{future, Future};
-use hashing;
 use indexmap::IndexMap;
 
 use std::path::PathBuf;

src/rust/engine/src/nodes.rs

@@ -28,9 +28,7 @@ use fs::{
   self, Dir, DirectoryListing, File, FileContent, GlobExpansionConjunction, GlobMatching, Link,
   PathGlobs, PathStat, PreparedPathGlobs, StrictGlobMatching, VFS,
 };
-use hashing;
 use process_execution::{self, MultiPlatformProcess, PlatformConstraint, Process, RelativePath};
-use rule_graph;
 
 use graph::{Entry, Node, NodeError, NodeTracer, NodeVisualizer};
 use store::{self, StoreFileByDigest};

src/rust/engine/src/scheduler.rs

@@ -17,7 +17,6 @@ use crate::core::{Failure, Params, TypeId, Value};
 use crate::nodes::{NodeKey, Select, Tracer, Visualizer};
 
 use graph::InvalidationResult;
-use hashing;
 use indexmap::IndexMap;
 use log::{debug, info, warn};
 use logging::logger::LOGGER;

src/rust/engine/src/selectors.rs

@@ -5,8 +5,6 @@ use std::fmt;
 
 use crate::core::TypeId;
 
-use rule_graph;
-
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub struct Get {
   pub product: TypeId,

src/rust/engine/src/tasks.rs

@@ -8,8 +8,6 @@ use crate::core::{Function, TypeId};
 use crate::intrinsics::Intrinsics;
 use crate::selectors::{DependencyKey, Get, Select};
 
-use rule_graph;
-
 #[derive(Eq, Hash, PartialEq, Clone, Debug)]
 pub enum Rule {
   // Intrinsic rules are implemented in rust.