snippet, snippet_opt, span_lint_and_then,
};
use if_chain::if_chain;
-use matches::matches;
-use rustc::traits;
-use rustc::traits::misc::can_type_implement_copy;
use rustc::ty::{self, TypeFoldable};
+use rustc_ast::ast::Attribute;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_errors::{Applicability, DiagnosticBuilder};
use rustc_hir::intravisit::FnKind;
-use rustc_hir::*;
+use rustc_hir::{BindingAnnotation, Body, FnDecl, GenericArg, HirId, ItemKind, Node, PatKind, QPath, TyKind};
+use rustc_infer::infer::TyCtxtInferExt;
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::{Span, Symbol};
use rustc_target::spec::abi::Abi;
+use rustc_trait_selection::traits;
+use rustc_trait_selection::traits::misc::can_type_implement_copy;
use rustc_typeck::expr_use_visitor as euv;
use std::borrow::Cow;
-use syntax::ast::Attribute;
declare_clippy_lint! {
/// **What it does:** Checks for functions taking arguments by value, but not