remove redundant imports (clippy::single_component_path_imports)

src/librustc/traits/mod.rs

@@ -31,7 +31,6 @@ use crate::ty::fold::{TypeFoldable, TypeFolder, TypeVisitor};
 use crate::ty::subst::{InternalSubsts, SubstsRef};
 use crate::ty::{self, AdtKind, GenericParamDefKind, List, ToPredicate, Ty, TyCtxt, WithConstness};
 use crate::util::common::ErrorReported;
-use chalk_engine;
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_macros::HashStable;

src/librustc/traits/structural_impls.rs

@@ -2,7 +2,6 @@ use crate::traits;
 use crate::traits::project::Normalized;
 use crate::ty::fold::{TypeFoldable, TypeFolder, TypeVisitor};
 use crate::ty::{self, Lift, Ty, TyCtxt};
-use chalk_engine;
 use rustc_span::symbol::Symbol;
 use smallvec::SmallVec;
 

src/librustc/ty/mod.rs

@@ -46,7 +46,6 @@ use rustc_target::abi::Align;
 use syntax::ast::{self, Constness, Ident, Name};
 use syntax::node_id::{NodeId, NodeMap, NodeSet};
 
-use smallvec;
 use std::cell::RefCell;
 use std::cmp::{self, Ordering};
 use std::fmt;

src/librustc_builtin_macros/log_syntax.rs

@@ -1,6 +1,5 @@
 use rustc_ast_pretty::pprust;
 use rustc_expand::base;
-use rustc_span;
 use syntax::tokenstream::TokenStream;
 
 pub fn expand_log_syntax<'cx>(

src/librustc_interface/callbacks.rs

@@ -11,7 +11,6 @@
 
 use rustc::ty::tls;
 use rustc_errors::{Diagnostic, TRACK_DIAGNOSTICS};
-use rustc_span;
 use std::fmt;
 
 /// This is a callback from libsyntax as it cannot access the implicit state

src/librustc_interface/passes.rs

@@ -17,7 +17,6 @@ use rustc::traits;
 use rustc::ty::steal::Steal;
 use rustc::ty::{self, GlobalCtxt, ResolverOutputs, TyCtxt};
 use rustc::util::common::ErrorReported;
-use rustc_builtin_macros;
 use rustc_codegen_ssa::back::link::emit_metadata;
 use rustc_codegen_utils::codegen_backend::CodegenBackend;
 use rustc_codegen_utils::link::filename_for_metadata;
@@ -26,18 +25,15 @@ use rustc_data_structures::{box_region_allow_access, declare_box_region_type, pa
 use rustc_errors::PResult;
 use rustc_expand::base::ExtCtxt;
 use rustc_hir::def_id::{CrateNum, LOCAL_CRATE};
-use rustc_incremental;
 use rustc_lint::LintStore;
 use rustc_mir as mir;
 use rustc_mir_build as mir_build;
 use rustc_parse::{parse_crate_from_file, parse_crate_from_source_str};
 use rustc_passes::{self, hir_stats, layout_test};
 use rustc_plugin_impl as plugin;
-use rustc_privacy;
 use rustc_resolve::{Resolver, ResolverArenas};
 use rustc_span::symbol::Symbol;
 use rustc_span::FileName;
-use rustc_traits;
 use rustc_typeck as typeck;
 use syntax::mut_visit::MutVisitor;
 use syntax::{self, ast, visit};

src/librustc_macros/src/lift.rs

@@ -1,7 +1,5 @@
-use proc_macro2;
 use quote::quote;
 use syn::{self, parse_quote};
-use synstructure;
 
 pub fn lift_derive(mut s: synstructure::Structure<'_>) -> proc_macro2::TokenStream {
     s.add_bounds(synstructure::AddBounds::Generics);

src/librustc_macros/src/query.rs

@@ -2,7 +2,6 @@ use itertools::Itertools;
 use proc_macro::TokenStream;
 use proc_macro2::{Delimiter, TokenTree};
 use quote::quote;
-use syn;
 use syn::parse::{Parse, ParseStream, Result};
 use syn::punctuated::Punctuated;
 use syn::spanned::Spanned;

src/librustc_macros/src/symbols.rs

@@ -1,7 +1,6 @@
 use proc_macro::TokenStream;
 use quote::quote;
 use std::collections::HashSet;
-use syn;
 use syn::parse::{Parse, ParseStream, Result};
 use syn::{braced, parse_macro_input, Ident, LitStr, Token};
 

src/librustc_macros/src/type_foldable.rs

@@ -1,6 +1,4 @@
 use quote::quote;
-use syn;
-use synstructure;
 
 pub fn type_foldable_derive(mut s: synstructure::Structure<'_>) -> proc_macro2::TokenStream {
     if let syn::Data::Union(_) = s.ast().data {

src/librustc_passes/dead.rs

@@ -15,7 +15,6 @@ use rustc_hir::itemlikevisit::ItemLikeVisitor;
 use rustc_hir::{Node, PatKind, TyKind};
 use rustc_session::lint;
 
-use rustc_span;
 use rustc_span::symbol::sym;
 use syntax::{ast, attr};
 

src/librustc_session/config.rs

@@ -22,8 +22,6 @@ use rustc_span::symbol::{sym, Symbol};
 use rustc_errors::emitter::HumanReadableErrorType;
 use rustc_errors::{ColorConfig, FatalError, Handler, HandlerFlags};
 
-use getopts;
-
 use std::collections::btree_map::{
     Iter as BTreeMapIter, Keys as BTreeMapKeysIter, Values as BTreeMapValuesIter,
 };
@@ -816,7 +814,6 @@ mod opt {
     #![allow(dead_code)]
 
     use super::RustcOptGroup;
-    use getopts;
 
     pub type R = RustcOptGroup;
     pub type S = &'static str;
@@ -1862,7 +1859,6 @@ pub fn parse_crate_types_from_list(list_list: Vec<String>) -> Result<Vec<CrateTy
 pub mod nightly_options {
     use super::{ErrorOutputType, OptionStability, RustcOptGroup};
     use crate::early_error;
-    use getopts;
     use rustc_feature::UnstableFeatures;
 
     pub fn is_unstable_enabled(matches: &getopts::Matches) -> bool {

src/librustc_session/options.rs

@@ -11,8 +11,6 @@ use rustc_target::spec::{LinkerFlavor, MergeFunctions, PanicStrategy, RelroLevel
 use rustc_feature::UnstableFeatures;
 use rustc_span::edition::Edition;
 
-use getopts;
-
 use std::collections::BTreeMap;
 
 use std::collections::hash_map::DefaultHasher;

src/librustc_session/session.rs

@@ -33,7 +33,6 @@ use rustc_data_structures::jobserver::{self, Client};
 use rustc_data_structures::profiling::{SelfProfiler, SelfProfilerRef};
 use rustc_target::spec::{PanicStrategy, RelroLevel, Target, TargetTriple};
 
-use std;
 use std::cell::{self, RefCell};
 use std::env;
 use std::fmt;

src/librustc_typeck/variance/mod.rs

@@ -3,7 +3,6 @@
 //!
 //! [rustc guide]: https://rust-lang.github.io/rustc-guide/variance.html
 
-use arena;
 use hir::Node;
 use rustc::ty::query::Providers;
 use rustc::ty::{self, CrateVariancesMap, TyCtxt};

src/librustdoc/clean/utils.rs

@@ -16,7 +16,6 @@ use rustc_data_structures::fx::FxHashSet;
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
-use rustc_span;
 use rustc_span::symbol::{kw, sym, Symbol};
 use std::mem;
 

src/librustdoc/config.rs

@@ -3,7 +3,6 @@ use std::ffi::OsStr;
 use std::fmt;
 use std::path::PathBuf;
 
-use getopts;
 use rustc::lint::Level;
 use rustc::session;
 use rustc::session::config::{
@@ -13,7 +12,6 @@ use rustc::session::config::{
 use rustc::session::config::{parse_crate_types_from_list, parse_externs, CrateType};
 use rustc::session::config::{CodegenOptions, DebuggingOptions, ErrorOutputType, Externs};
 use rustc::session::search_paths::SearchPath;
-use rustc_driver;
 use rustc_span::edition::{Edition, DEFAULT_EDITION};
 use rustc_target::spec::TargetTriple;
 

src/librustdoc/core.rs

@@ -11,7 +11,6 @@ use rustc_hir::def::Namespace::TypeNS;
 use rustc_hir::def_id::{CrateNum, DefId, DefIndex, LOCAL_CRATE};
 use rustc_hir::HirId;
 use rustc_interface::interface;
-use rustc_lint;
 use rustc_resolve as resolve;
 use rustc_session::lint;
 

src/librustdoc/html/render.rs

@@ -73,8 +73,6 @@ use crate::html::markdown::{self, ErrorCodes, IdMap, Markdown, MarkdownHtml, Mar
 use crate::html::sources;
 use crate::html::{highlight, layout, static_files};
 
-use minifier;
-
 #[cfg(test)]
 mod tests;
 

src/librustdoc/markdown.rs

@@ -5,7 +5,6 @@ use std::path::PathBuf;
 use rustc_feature::UnstableFeatures;
 use rustc_span::edition::Edition;
 use rustc_span::source_map::DUMMY_SP;
-use testing;
 
 use crate::config::{Options, RenderOptions};
 use crate::externalfiles::{load_string, LoadStringError};

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -13,7 +13,6 @@ use rustc_hir::def_id::DefId;
 use rustc_resolve::ParentScope;
 use rustc_span::symbol::Symbol;
 use rustc_span::DUMMY_SP;
-use syntax;
 use syntax::ast::{self, Ident};
 
 use std::ops::Range;

src/librustdoc/test.rs

@@ -20,7 +20,6 @@ use std::str;
 use syntax::ast;
 use syntax::with_globals;
 use tempfile::Builder as TempFileBuilder;
-use testing;
 
 use crate::clean::Attributes;
 use crate::config::Options;

src/libtest/cli.rs

@@ -1,6 +1,5 @@
 //! Module converting command-line arguments into test configuration.
 
-use getopts;
 use std::env;
 use std::path::PathBuf;
 

src/libtest/console.rs

@@ -4,8 +4,6 @@ use std::fs::File;
 use std::io;
 use std::io::prelude::Write;
 
-use term;
-
 use super::{
     bench::fmt_bench_samples,
     cli::TestOpts,