Remove unused imports.

Author: xiongmao86

CONTRIBUTING.md

@@ -110,7 +110,7 @@ It's worth noting that the majority of `clippy_lints/src/lib.rs` is autogenerate
 ```rust
 // ./clippy_lints/src/else_if_without_else.rs
 
-use rustc::lint::{EarlyLintPass, LintArray, LintPass};
+use rustc::lint::EarlyLintPass;
 
 // ...
 

clippy_lints/src/approx_const.rs

@@ -1,7 +1,7 @@
 use crate::utils::span_lint;
-use rustc_session::declare_lint_pass;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use rustc::lint::{LateContext, LateLintPass};
 use rustc_hir::*;
+use rustc_session::declare_lint_pass;
 use rustc_session::declare_tool_lint;
 use rustc_span::symbol;
 use std::f64::consts as f64;

clippy_lints/src/arithmetic.rs

@@ -1,9 +1,9 @@
 use crate::consts::constant_simple;
 use crate::utils::span_lint;
-use rustc_session::impl_lint_pass;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use rustc::lint::{LateContext, LateLintPass};
 use rustc_hir as hir;
 use rustc_session::declare_tool_lint;
+use rustc_session::impl_lint_pass;
 use rustc_span::source_map::Span;
 
 declare_clippy_lint! {

clippy_lints/src/as_conversions.rs

@@ -1,5 +1,5 @@
+use rustc::lint::{in_external_macro, EarlyContext, EarlyLintPass, LintContext};
 use rustc_session::declare_lint_pass;
-use rustc::lint::{in_external_macro, EarlyContext, EarlyLintPass, LintArray, LintContext, LintPass};
 use rustc_session::declare_tool_lint;
 use syntax::ast::*;
 

clippy_lints/src/assertions_on_constants.rs

@@ -2,9 +2,9 @@ use crate::consts::{constant, Constant};
 use crate::utils::paths;
 use crate::utils::{is_direct_expn_of, is_expn_of, match_function_call, snippet_opt, span_help_and_lint};
 use if_chain::if_chain;
-use rustc_session::declare_lint_pass;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use rustc::lint::{LateContext, LateLintPass};
 use rustc_hir::*;
+use rustc_session::declare_lint_pass;
 use rustc_session::declare_tool_lint;
 use syntax::ast::LitKind;
 

clippy_lints/src/assign_ops.rs

@@ -3,12 +3,12 @@ use crate::utils::{
 };
 use crate::utils::{higher, sugg};
 use if_chain::if_chain;
-use rustc_session::declare_lint_pass;
 use rustc::hir::map::Map;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use rustc::lint::{LateContext, LateLintPass};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
+use rustc_session::declare_lint_pass;
 use rustc_session::declare_tool_lint;
 
 declare_clippy_lint! {

clippy_lints/src/atomic_ordering.rs

@@ -1,10 +1,10 @@
 use crate::utils::{match_def_path, span_help_and_lint};
 use if_chain::if_chain;
-use rustc_session::declare_lint_pass;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use rustc::lint::{LateContext, LateLintPass};
 use rustc::ty;
 use rustc_hir::def_id::DefId;
 use rustc_hir::*;
+use rustc_session::declare_lint_pass;
 use rustc_session::declare_tool_lint;
 
 declare_clippy_lint! {

clippy_lints/src/attrs.rs

@@ -6,14 +6,13 @@ use crate::utils::{
     span_lint_and_then, without_block_comments,
 };
 use if_chain::if_chain;
-use rustc_session::declare_lint_pass;
 use rustc::lint::{
-    in_external_macro, CheckLintNameResult, EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintArray,
-    LintContext, LintPass,
+    in_external_macro, CheckLintNameResult, EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext,
 };
 use rustc::ty;
 use rustc_errors::Applicability;
 use rustc_hir::*;
+use rustc_session::declare_lint_pass;
 use rustc_session::declare_tool_lint;
 use rustc_span::source_map::Span;
 use rustc_span::symbol::Symbol;

clippy_lints/src/bit_mask.rs

@@ -2,11 +2,11 @@ use crate::consts::{constant, Constant};
 use crate::utils::sugg::Sugg;
 use crate::utils::{span_lint, span_lint_and_then};
 use if_chain::if_chain;
-use rustc_session::impl_lint_pass;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use rustc::lint::{LateContext, LateLintPass};
 use rustc_errors::Applicability;
 use rustc_hir::*;
 use rustc_session::declare_tool_lint;
+use rustc_session::impl_lint_pass;
 use rustc_span::source_map::Span;
 use syntax::ast::LitKind;
 

clippy_lints/src/blacklisted_name.rs

@@ -1,9 +1,9 @@
 use crate::utils::span_lint;
-use rustc_session::impl_lint_pass;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use rustc::lint::{LateContext, LateLintPass};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::*;
 use rustc_session::declare_tool_lint;
+use rustc_session::impl_lint_pass;
 
 declare_clippy_lint! {
     /// **What it does:** Checks for usage of blacklisted names for variables, such