Rollup merge of #68815 - matthiaskrgr:redundant_imports, r=alexcrichton

remove redundant imports (clippy::single_component_path_imports)

Author: Dylan-DPC

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 {