diff --git a/clippy_lints/src/assign_ops.rs b/clippy_lints/src/assign_ops.rs
index 98020303d37ee..6d938687fa27f 100644
--- a/clippy_lints/src/assign_ops.rs
+++ b/clippy_lints/src/assign_ops.rs
@@ -99,7 +99,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for AssignOps {
                                         let parent_fn = cx.tcx.hir().get_parent_item(e.hir_id);
                                         if_chain! {
                                             if let Some(trait_ref) = trait_ref_of_method(cx, parent_fn);
-                                            if trait_ref.path.def.def_id() == trait_id;
+                                            if trait_ref.path.res.def_id() == trait_id;
                                             then { return; }
                                         }
                                         implements_trait($cx, $ty, trait_id, &[$rty])
diff --git a/clippy_lints/src/attrs.rs b/clippy_lints/src/attrs.rs
index 3f62a02b45730..58cd2bca95978 100644
--- a/clippy_lints/src/attrs.rs
+++ b/clippy_lints/src/attrs.rs
@@ -394,7 +394,7 @@ fn is_relevant_expr(cx: &LateContext<'_, '_>, tables: &ty::TypeckTables<'_>, exp
         ExprKind::Ret(None) | ExprKind::Break(_, None) => false,
         ExprKind::Call(path_expr, _) => {
             if let ExprKind::Path(qpath) = &path_expr.node {
-                if let Some(fun_id) = tables.qpath_def(qpath, path_expr.hir_id).opt_def_id() {
+                if let Some(fun_id) = tables.qpath_res(qpath, path_expr.hir_id).opt_def_id() {
                     !cx.match_def_path(fun_id, &paths::BEGIN_PANIC)
                 } else {
                     true
diff --git a/clippy_lints/src/consts.rs b/clippy_lints/src/consts.rs
index e86e51b7f88c7..3cdd0f727fb61 100644
--- a/clippy_lints/src/consts.rs
+++ b/clippy_lints/src/consts.rs
@@ -2,7 +2,7 @@
 
 use crate::utils::{clip, sext, unsext};
 use if_chain::if_chain;
-use rustc::hir::def::Def;
+use rustc::hir::def::{DefKind, Res};
 use rustc::hir::*;
 use rustc::lint::LateContext;
 use rustc::ty::subst::{Subst, SubstsRef};
@@ -247,8 +247,8 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
                 if_chain! {
                     if args.is_empty();
                     if let ExprKind::Path(qpath) = &callee.node;
-                    let def = self.tables.qpath_def(qpath, callee.hir_id);
-                    if let Some(def_id) = def.opt_def_id();
+                    let res = self.tables.qpath_res(qpath, callee.hir_id);
+                    if let Some(def_id) = res.opt_def_id();
                     let def_path = self.lcx.get_def_path(def_id)
                         .iter()
                         .map(LocalInternedString::get)
@@ -322,9 +322,9 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
     fn fetch_path(&mut self, qpath: &QPath, id: HirId) -> Option<Constant> {
         use rustc::mir::interpret::GlobalId;
 
-        let def = self.tables.qpath_def(qpath, id);
-        match def {
-            Def::Const(def_id) | Def::AssociatedConst(def_id) => {
+        let res = self.tables.qpath_res(qpath, id);
+        match res {
+            Res::Def(DefKind::Const, def_id) | Res::Def(DefKind::AssociatedConst, def_id) => {
                 let substs = self.tables.node_substs(id);
                 let substs = if self.substs.is_empty() {
                     substs
@@ -338,11 +338,11 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
                 };
 
                 let result = self.lcx.tcx.const_eval(self.param_env.and(gid)).ok()?;
-                let ret = miri_to_const(self.lcx.tcx, &result);
-                if ret.is_some() {
+                let result = miri_to_const(self.lcx.tcx, &result);
+                if result.is_some() {
                     self.needed_resolution = true;
                 }
-                ret
+                result
             },
             // FIXME: cover all usable cases.
             _ => None,
diff --git a/clippy_lints/src/default_trait_access.rs b/clippy_lints/src/default_trait_access.rs
index 3e3663d6d0ae5..8597835d8050f 100644
--- a/clippy_lints/src/default_trait_access.rs
+++ b/clippy_lints/src/default_trait_access.rs
@@ -36,7 +36,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for DefaultTraitAccess {
             if let ExprKind::Call(ref path, ..) = expr.node;
             if !any_parent_is_automatically_derived(cx.tcx, expr.hir_id);
             if let ExprKind::Path(ref qpath) = path.node;
-            if let Some(def_id) = cx.tables.qpath_def(qpath, path.hir_id).opt_def_id();
+            if let Some(def_id) = cx.tables.qpath_res(qpath, path.hir_id).opt_def_id();
             if cx.match_def_path(def_id, &paths::DEFAULT_TRAIT_METHOD);
             then {
                 match qpath {
diff --git a/clippy_lints/src/drop_bounds.rs b/clippy_lints/src/drop_bounds.rs
index 4c7c866fc6354..89e405c93670e 100644
--- a/clippy_lints/src/drop_bounds.rs
+++ b/clippy_lints/src/drop_bounds.rs
@@ -55,7 +55,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for DropBounds {
 fn lint_bound<'a, 'tcx>(cx: &rustc::lint::LateContext<'a, 'tcx>, bound: &'tcx GenericBound) {
     if_chain! {
         if let GenericBound::Trait(t, _) = bound;
-        if let Some(def_id) = t.trait_ref.path.def.opt_def_id();
+        if let Some(def_id) = t.trait_ref.path.res.opt_def_id();
         if cx.match_def_path(def_id, &paths::DROP_TRAIT);
         then {
             span_lint(
diff --git a/clippy_lints/src/drop_forget_ref.rs b/clippy_lints/src/drop_forget_ref.rs
index 44853cd799032..e36e7353a57ac 100644
--- a/clippy_lints/src/drop_forget_ref.rs
+++ b/clippy_lints/src/drop_forget_ref.rs
@@ -114,7 +114,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for DropForgetRef {
             if let ExprKind::Call(ref path, ref args) = expr.node;
             if let ExprKind::Path(ref qpath) = path.node;
             if args.len() == 1;
-            if let Some(def_id) = cx.tables.qpath_def(qpath, path.hir_id).opt_def_id();
+            if let Some(def_id) = cx.tables.qpath_res(qpath, path.hir_id).opt_def_id();
             then {
                 let lint;
                 let msg;
diff --git a/clippy_lints/src/enum_glob_use.rs b/clippy_lints/src/enum_glob_use.rs
index 673f471b83c00..d658e9baf5dbe 100644
--- a/clippy_lints/src/enum_glob_use.rs
+++ b/clippy_lints/src/enum_glob_use.rs
@@ -1,7 +1,7 @@
 //! lint on `use`ing all variants of an enum
 
 use crate::utils::span_lint;
-use rustc::hir::def::Def;
+use rustc::hir::def::{DefKind, Res};
 use rustc::hir::*;
 use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
 use rustc::{declare_lint_pass, declare_tool_lint};
@@ -43,7 +43,7 @@ impl EnumGlobUse {
             return; // re-exports are fine
         }
         if let ItemKind::Use(ref path, UseKind::Glob) = item.node {
-            if let Def::Enum(_) = path.def {
+            if let Res::Def(DefKind::Enum, _) = path.res {
                 span_lint(cx, ENUM_GLOB_USE, item.span, "don't use glob imports for enum variants");
             }
         }
diff --git a/clippy_lints/src/eval_order_dependence.rs b/clippy_lints/src/eval_order_dependence.rs
index a62bb3cda9b6e..dc98158c50991 100644
--- a/clippy_lints/src/eval_order_dependence.rs
+++ b/clippy_lints/src/eval_order_dependence.rs
@@ -63,7 +63,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for EvalOrderDependence {
                 if let ExprKind::Path(ref qpath) = lhs.node {
                     if let QPath::Resolved(_, ref path) = *qpath {
                         if path.segments.len() == 1 {
-                            if let def::Def::Local(var) = cx.tables.qpath_def(qpath, lhs.hir_id) {
+                            if let def::Res::Local(var) = cx.tables.qpath_res(qpath, lhs.hir_id) {
                                 let mut visitor = ReadVisitor {
                                     cx,
                                     var,
@@ -295,7 +295,7 @@ impl<'a, 'tcx> Visitor<'tcx> for ReadVisitor<'a, 'tcx> {
                 if_chain! {
                     if let QPath::Resolved(None, ref path) = *qpath;
                     if path.segments.len() == 1;
-                    if let def::Def::Local(local_id) = self.cx.tables.qpath_def(qpath, expr.hir_id);
+                    if let def::Res::Local(local_id) = self.cx.tables.qpath_res(qpath, expr.hir_id);
                     if local_id == self.var;
                     // Check that this is a read, not a write.
                     if !is_in_assignment_position(self.cx, expr);
diff --git a/clippy_lints/src/fallible_impl_from.rs b/clippy_lints/src/fallible_impl_from.rs
index 1cbe9d218bdfd..6e97857131e60 100644
--- a/clippy_lints/src/fallible_impl_from.rs
+++ b/clippy_lints/src/fallible_impl_from.rs
@@ -61,7 +61,7 @@ fn lint_impl_body<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, impl_span: Span, impl_it
             if_chain! {
                 if let ExprKind::Call(ref func_expr, _) = expr.node;
                 if let ExprKind::Path(QPath::Resolved(_, ref path)) = func_expr.node;
-                if let Some(path_def_id) = path.def.opt_def_id();
+                if let Some(path_def_id) = path.res.opt_def_id();
                 if self.lcx.match_def_path(path_def_id, &BEGIN_PANIC) ||
                     self.lcx.match_def_path(path_def_id, &BEGIN_PANIC_FMT);
                 if is_expn_of(expr.span, "unreachable").is_none();
diff --git a/clippy_lints/src/functions.rs b/clippy_lints/src/functions.rs
index 67af615bf762b..84cafd1056ce8 100644
--- a/clippy_lints/src/functions.rs
+++ b/clippy_lints/src/functions.rs
@@ -3,7 +3,7 @@ use std::convert::TryFrom;
 use crate::utils::{iter_input_pats, snippet, snippet_opt, span_lint, type_is_unsafe_function};
 use matches::matches;
 use rustc::hir;
-use rustc::hir::def::Def;
+use rustc::hir::def::Res;
 use rustc::hir::intravisit;
 use rustc::lint::{in_external_macro, LateContext, LateLintPass, LintArray, LintContext, LintPass};
 use rustc::ty;
@@ -333,7 +333,7 @@ impl<'a, 'tcx> hir::intravisit::Visitor<'tcx> for DerefVisitor<'a, 'tcx> {
 impl<'a, 'tcx: 'a> DerefVisitor<'a, 'tcx> {
     fn check_arg(&self, ptr: &hir::Expr) {
         if let hir::ExprKind::Path(ref qpath) = ptr.node {
-            if let Def::Local(id) = self.cx.tables.qpath_def(qpath, ptr.hir_id) {
+            if let Res::Local(id) = self.cx.tables.qpath_res(qpath, ptr.hir_id) {
                 if self.ptrs.contains(&id) {
                     span_lint(
                         self.cx,
diff --git a/clippy_lints/src/invalid_ref.rs b/clippy_lints/src/invalid_ref.rs
index 40a11cde44598..677b20999360a 100644
--- a/clippy_lints/src/invalid_ref.rs
+++ b/clippy_lints/src/invalid_ref.rs
@@ -35,7 +35,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InvalidRef {
             if let ExprKind::Path(ref qpath) = path.node;
             if args.len() == 0;
             if let ty::Ref(..) = cx.tables.expr_ty(expr).sty;
-            if let Some(def_id) = cx.tables.qpath_def(qpath, path.hir_id).opt_def_id();
+            if let Some(def_id) = cx.tables.qpath_res(qpath, path.hir_id).opt_def_id();
             then {
                 let msg = if cx.match_def_path(def_id, &paths::MEM_ZEROED) |
                              cx.match_def_path(def_id, &paths::INIT)
diff --git a/clippy_lints/src/let_if_seq.rs b/clippy_lints/src/let_if_seq.rs
index 36ba198de8d10..8a6456925a3d7 100644
--- a/clippy_lints/src/let_if_seq.rs
+++ b/clippy_lints/src/let_if_seq.rs
@@ -1,7 +1,7 @@
 use crate::utils::{snippet, span_lint_and_then};
 use if_chain::if_chain;
 use rustc::hir;
-use rustc::hir::def::Def;
+use rustc::hir::def::Res;
 use rustc::hir::BindingAnnotation;
 use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
 use rustc::{declare_lint_pass, declare_tool_lint};
@@ -145,7 +145,7 @@ impl<'a, 'tcx> hir::intravisit::Visitor<'tcx> for UsedVisitor<'a, 'tcx> {
     fn visit_expr(&mut self, expr: &'tcx hir::Expr) {
         if_chain! {
             if let hir::ExprKind::Path(ref qpath) = expr.node;
-            if let Def::Local(local_id) = self.cx.tables.qpath_def(qpath, expr.hir_id);
+            if let Res::Local(local_id) = self.cx.tables.qpath_res(qpath, expr.hir_id);
             if self.id == local_id;
             then {
                 self.used = true;
@@ -170,7 +170,7 @@ fn check_assign<'a, 'tcx>(
         if let hir::StmtKind::Semi(ref expr) = expr.node;
         if let hir::ExprKind::Assign(ref var, ref value) = expr.node;
         if let hir::ExprKind::Path(ref qpath) = var.node;
-        if let Def::Local(local_id) = cx.tables.qpath_def(qpath, var.hir_id);
+        if let Res::Local(local_id) = cx.tables.qpath_res(qpath, var.hir_id);
         if decl == local_id;
         then {
             let mut v = UsedVisitor {
diff --git a/clippy_lints/src/lifetimes.rs b/clippy_lints/src/lifetimes.rs
index 60b243784ee63..e868adee7eb55 100644
--- a/clippy_lints/src/lifetimes.rs
+++ b/clippy_lints/src/lifetimes.rs
@@ -1,5 +1,5 @@
 use matches::matches;
-use rustc::hir::def::Def;
+use rustc::hir::def::{DefKind, Res};
 use rustc::hir::intravisit::*;
 use rustc::hir::*;
 use rustc::lint::{in_external_macro, LateContext, LateLintPass, LintArray, LintContext, LintPass};
@@ -310,14 +310,14 @@ impl<'v, 't> RefVisitor<'v, 't> {
                 })
             {
                 let hir_id = ty.hir_id;
-                match self.cx.tables.qpath_def(qpath, hir_id) {
-                    Def::TyAlias(def_id) | Def::Struct(def_id) => {
+                match self.cx.tables.qpath_res(qpath, hir_id) {
+                    Res::Def(DefKind::TyAlias, def_id) | Res::Def(DefKind::Struct, def_id) => {
                         let generics = self.cx.tcx.generics_of(def_id);
                         for _ in generics.params.as_slice() {
                             self.record(&None);
                         }
                     },
-                    Def::Trait(def_id) => {
+                    Res::Def(DefKind::Trait, def_id) => {
                         let trait_def = self.cx.tcx.trait_def(def_id);
                         for _ in &self.cx.tcx.generics_of(trait_def.def_id).params {
                             self.record(&None);
diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs
index d82be14e40cdb..362f3ebdf5c4f 100644
--- a/clippy_lints/src/loops.rs
+++ b/clippy_lints/src/loops.rs
@@ -1,7 +1,7 @@
 use crate::reexport::*;
 use if_chain::if_chain;
 use itertools::Itertools;
-use rustc::hir::def::Def;
+use rustc::hir::def::{DefKind, Res};
 use rustc::hir::def_id;
 use rustc::hir::intravisit::{walk_block, walk_expr, walk_pat, walk_stmt, NestedVisitorMap, Visitor};
 use rustc::hir::*;
@@ -778,7 +778,7 @@ fn same_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr, var: HirId) -> bo
         if let ExprKind::Path(ref qpath) = expr.node;
         if let QPath::Resolved(None, ref path) = *qpath;
         if path.segments.len() == 1;
-        if let Def::Local(local_id) = cx.tables.qpath_def(qpath, expr.hir_id);
+        if let Res::Local(local_id) = cx.tables.qpath_res(qpath, expr.hir_id);
         // our variable!
         if local_id == var;
         then {
@@ -1637,8 +1637,8 @@ fn check_for_mutability(cx: &LateContext<'_, '_>, bound: &Expr) -> Option<HirId>
         if let ExprKind::Path(ref qpath) = bound.node;
         if let QPath::Resolved(None, _) = *qpath;
         then {
-            let def = cx.tables.qpath_def(qpath, bound.hir_id);
-            if let Def::Local(node_id) = def {
+            let res = cx.tables.qpath_res(qpath, bound.hir_id);
+            if let Res::Local(node_id) = res {
                 let node_str = cx.tcx.hir().get_by_hir_id(node_id);
                 if_chain! {
                     if let Node::Binding(pat) = node_str;
@@ -1772,9 +1772,9 @@ impl<'a, 'tcx> VarVisitor<'a, 'tcx> {
                     if self.prefer_mutable {
                         self.indexed_mut.insert(seqvar.segments[0].ident.name);
                     }
-                    let def = self.cx.tables.qpath_def(seqpath, seqexpr.hir_id);
-                    match def {
-                        Def::Local(hir_id) | Def::Upvar(hir_id, ..) => {
+                    let res = self.cx.tables.qpath_res(seqpath, seqexpr.hir_id);
+                    match res {
+                        Res::Local(hir_id) | Res::Upvar(hir_id, ..) => {
                             let parent_id = self.cx.tcx.hir().get_parent_item(expr.hir_id);
                             let parent_def_id = self.cx.tcx.hir().local_def_id_from_hir_id(parent_id);
                             let extent = self.cx.tcx.region_scope_tree(parent_def_id).var_scope(hir_id.local_id);
@@ -1789,7 +1789,7 @@ impl<'a, 'tcx> VarVisitor<'a, 'tcx> {
                             }
                             return false;  // no need to walk further *on the variable*
                         }
-                        Def::Static(..) | Def::Const(..) => {
+                        Res::Def(DefKind::Static, ..) | Res::Def(DefKind::Const, ..) => {
                             if indexed_indirectly {
                                 self.indexed_indirectly.insert(seqvar.segments[0].ident.name, None);
                             }
@@ -1834,14 +1834,14 @@ impl<'a, 'tcx> Visitor<'tcx> for VarVisitor<'a, 'tcx> {
             if let QPath::Resolved(None, ref path) = *qpath;
             if path.segments.len() == 1;
             then {
-                match self.cx.tables.qpath_def(qpath, expr.hir_id) {
-                    Def::Upvar(local_id, ..) => {
+                match self.cx.tables.qpath_res(qpath, expr.hir_id) {
+                    Res::Upvar(local_id, ..) => {
                         if local_id == self.var {
                             // we are not indexing anything, record that
                             self.nonindex = true;
                         }
                     }
-                    Def::Local(local_id) =>
+                    Res::Local(local_id) =>
                     {
 
                         if local_id == self.var {
@@ -2187,8 +2187,8 @@ impl<'a, 'tcx> Visitor<'tcx> for InitializeVisitor<'a, 'tcx> {
 
 fn var_def_id(cx: &LateContext<'_, '_>, expr: &Expr) -> Option<HirId> {
     if let ExprKind::Path(ref qpath) = expr.node {
-        let path_res = cx.tables.qpath_def(qpath, expr.hir_id);
-        if let Def::Local(node_id) = path_res {
+        let path_res = cx.tables.qpath_res(qpath, expr.hir_id);
+        if let Res::Local(node_id) = path_res {
             return Some(node_id);
         }
     }
@@ -2380,13 +2380,13 @@ impl<'a, 'tcx> VarCollectorVisitor<'a, 'tcx> {
         if_chain! {
             if let ExprKind::Path(ref qpath) = ex.node;
             if let QPath::Resolved(None, _) = *qpath;
-            let def = self.cx.tables.qpath_def(qpath, ex.hir_id);
+            let res = self.cx.tables.qpath_res(qpath, ex.hir_id);
             then {
-                match def {
-                    Def::Local(node_id) | Def::Upvar(node_id, ..) => {
+                match res {
+                    Res::Local(node_id) | Res::Upvar(node_id, ..) => {
                         self.ids.insert(node_id);
                     },
-                    Def::Static(def_id) => {
+                    Res::Def(DefKind::Static, def_id) => {
                         let mutable = self.cx.tcx.is_mutable_static(def_id);
                         self.def_ids.insert(def_id, mutable);
                     },
diff --git a/clippy_lints/src/matches.rs b/clippy_lints/src/matches.rs
index bcd3119b7bc58..21c3aded6c6bc 100644
--- a/clippy_lints/src/matches.rs
+++ b/clippy_lints/src/matches.rs
@@ -505,11 +505,11 @@ fn check_wild_enum_match(cx: &LateContext<'_, '_>, ex: &Expr, arms: &[Arm]) {
             for pat in &arm.pats {
                 if let PatKind::Path(ref path) = pat.deref().node {
                     if let QPath::Resolved(_, p) = path {
-                        missing_variants.retain(|e| e.ctor_def_id != Some(p.def.def_id()));
+                        missing_variants.retain(|e| e.ctor_def_id != Some(p.res.def_id()));
                     }
                 } else if let PatKind::TupleStruct(ref path, ..) = pat.deref().node {
                     if let QPath::Resolved(_, p) = path {
-                        missing_variants.retain(|e| e.ctor_def_id != Some(p.def.def_id()));
+                        missing_variants.retain(|e| e.ctor_def_id != Some(p.res.def_id()));
                     }
                 }
             }
diff --git a/clippy_lints/src/mem_discriminant.rs b/clippy_lints/src/mem_discriminant.rs
index 0028929038737..296954972b1ca 100644
--- a/clippy_lints/src/mem_discriminant.rs
+++ b/clippy_lints/src/mem_discriminant.rs
@@ -35,7 +35,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MemDiscriminant {
             if let ExprKind::Call(ref func, ref func_args) = expr.node;
             // is `mem::discriminant`
             if let ExprKind::Path(ref func_qpath) = func.node;
-            if let Some(def_id) = cx.tables.qpath_def(func_qpath, func.hir_id).opt_def_id();
+            if let Some(def_id) = cx.tables.qpath_res(func_qpath, func.hir_id).opt_def_id();
             if cx.match_def_path(def_id, &paths::MEM_DISCRIMINANT);
             // type is non-enum
             let ty_param = cx.tables.node_substs(func.hir_id).type_at(0);
diff --git a/clippy_lints/src/mem_forget.rs b/clippy_lints/src/mem_forget.rs
index 4fabfac0ab65d..d4c6471916729 100644
--- a/clippy_lints/src/mem_forget.rs
+++ b/clippy_lints/src/mem_forget.rs
@@ -27,7 +27,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MemForget {
     fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, e: &'tcx Expr) {
         if let ExprKind::Call(ref path_expr, ref args) = e.node {
             if let ExprKind::Path(ref qpath) = path_expr.node {
-                if let Some(def_id) = cx.tables.qpath_def(qpath, path_expr.hir_id).opt_def_id() {
+                if let Some(def_id) = cx.tables.qpath_res(qpath, path_expr.hir_id).opt_def_id() {
                     if cx.match_def_path(def_id, &paths::MEM_FORGET) {
                         let forgot_ty = cx.tables.expr_ty(&args[0]);
 
diff --git a/clippy_lints/src/mem_replace.rs b/clippy_lints/src/mem_replace.rs
index 49d0a6de229a8..ee4780c10e6ec 100644
--- a/clippy_lints/src/mem_replace.rs
+++ b/clippy_lints/src/mem_replace.rs
@@ -41,7 +41,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MemReplace {
             if let ExprKind::Call(ref func, ref func_args) = expr.node;
             if func_args.len() == 2;
             if let ExprKind::Path(ref func_qpath) = func.node;
-            if let Some(def_id) = cx.tables.qpath_def(func_qpath, func.hir_id).opt_def_id();
+            if let Some(def_id) = cx.tables.qpath_res(func_qpath, func.hir_id).opt_def_id();
             if cx.match_def_path(def_id, &paths::MEM_REPLACE);
 
             // Check that second argument is `Option::None`
diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs
index 2cf73433b05d3..2e342ee165a34 100644
--- a/clippy_lints/src/methods/mod.rs
+++ b/clippy_lints/src/methods/mod.rs
@@ -8,7 +8,7 @@ use std::iter;
 use if_chain::if_chain;
 use matches::matches;
 use rustc::hir;
-use rustc::hir::def::Def;
+use rustc::hir::def::{DefKind, Res};
 use rustc::lint::{in_external_macro, LateContext, LateLintPass, Lint, LintArray, LintContext, LintPass};
 use rustc::ty::{self, Predicate, Ty};
 use rustc::{declare_lint_pass, declare_tool_lint};
@@ -1504,7 +1504,7 @@ fn lint_cstring_as_ptr(cx: &LateContext<'_, '_>, expr: &hir::Expr, new: &hir::Ex
         if let hir::ExprKind::Call(ref fun, ref args) = new.node;
         if args.len() == 1;
         if let hir::ExprKind::Path(ref path) = fun.node;
-        if let Def::Method(did) = cx.tables.qpath_def(path, fun.hir_id);
+        if let Res::Def(DefKind::Method, did) = cx.tables.qpath_res(path, fun.hir_id);
         if cx.match_def_path(did, &paths::CSTRING_NEW);
         then {
             span_lint_and_then(
diff --git a/clippy_lints/src/methods/unnecessary_filter_map.rs b/clippy_lints/src/methods/unnecessary_filter_map.rs
index c751de865bee1..fde58b4ff7f05 100644
--- a/clippy_lints/src/methods/unnecessary_filter_map.rs
+++ b/clippy_lints/src/methods/unnecessary_filter_map.rs
@@ -2,7 +2,7 @@ use crate::utils::paths;
 use crate::utils::usage::mutated_variables;
 use crate::utils::{match_qpath, match_trait_method, span_lint};
 use rustc::hir;
-use rustc::hir::def::Def;
+use rustc::hir::def::Res;
 use rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc::lint::LateContext;
 
@@ -66,7 +66,7 @@ fn check_expression<'a, 'tcx: 'a>(
                     if match_qpath(path, &paths::OPTION_SOME) {
                         if_chain! {
                             if let hir::ExprKind::Path(path) = &args[0].node;
-                            if let Def::Local(ref local) = cx.tables.qpath_def(path, args[0].hir_id);
+                            if let Res::Local(ref local) = cx.tables.qpath_res(path, args[0].hir_id);
                             then {
                                 if arg_id == *local {
                                     return (false, false)
diff --git a/clippy_lints/src/minmax.rs b/clippy_lints/src/minmax.rs
index b5c064869a42c..1e99fffbddf98 100644
--- a/clippy_lints/src/minmax.rs
+++ b/clippy_lints/src/minmax.rs
@@ -62,7 +62,7 @@ enum MinMax {
 fn min_max<'a>(cx: &LateContext<'_, '_>, expr: &'a Expr) -> Option<(MinMax, Constant, &'a Expr)> {
     if let ExprKind::Call(ref path, ref args) = expr.node {
         if let ExprKind::Path(ref qpath) = path.node {
-            cx.tables.qpath_def(qpath, path.hir_id).opt_def_id().and_then(|def_id| {
+            cx.tables.qpath_res(qpath, path.hir_id).opt_def_id().and_then(|def_id| {
                 if cx.match_def_path(def_id, &paths::CMP_MIN) {
                     fetch_const(cx, args, MinMax::Min)
                 } else if cx.match_def_path(def_id, &paths::CMP_MAX) {
diff --git a/clippy_lints/src/misc.rs b/clippy_lints/src/misc.rs
index 6e41249ea6488..fed23bba9a833 100644
--- a/clippy_lints/src/misc.rs
+++ b/clippy_lints/src/misc.rs
@@ -410,7 +410,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MiscLints {
                     binding != "_result" && // FIXME: #944
                     is_used(cx, expr) &&
                     // don't lint if the declaration is in a macro
-                    non_macro_local(cx, &cx.tables.qpath_def(qpath, expr.hir_id))
+                    non_macro_local(cx, cx.tables.qpath_res(qpath, expr.hir_id))
                 {
                     Some(binding)
                 } else {
@@ -599,10 +599,10 @@ fn in_attributes_expansion(expr: &Expr) -> bool {
         .map_or(false, |info| matches!(info.format, ExpnFormat::MacroAttribute(_)))
 }
 
-/// Tests whether `def` is a variable defined outside a macro.
-fn non_macro_local(cx: &LateContext<'_, '_>, def: &def::Def) -> bool {
-    match *def {
-        def::Def::Local(id) | def::Def::Upvar(id, _, _) => !in_macro(cx.tcx.hir().span_by_hir_id(id)),
+/// Tests whether `res` is a variable defined outside a macro.
+fn non_macro_local(cx: &LateContext<'_, '_>, res: def::Res) -> bool {
+    match res {
+        def::Res::Local(id) | def::Res::Upvar(id, ..) => !in_macro(cx.tcx.hir().span_by_hir_id(id)),
         _ => false,
     }
 }
diff --git a/clippy_lints/src/no_effect.rs b/clippy_lints/src/no_effect.rs
index 1836e929e180c..ec4912634462a 100644
--- a/clippy_lints/src/no_effect.rs
+++ b/clippy_lints/src/no_effect.rs
@@ -1,5 +1,5 @@
 use crate::utils::{has_drop, in_macro, snippet_opt, span_lint, span_lint_and_sugg};
-use rustc::hir::def::Def;
+use rustc::hir::def::{DefKind, Res};
 use rustc::hir::{BinOpKind, BlockCheckMode, Expr, ExprKind, Stmt, StmtKind, UnsafeSource};
 use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
 use rustc::{declare_lint_pass, declare_tool_lint};
@@ -70,9 +70,9 @@ fn has_no_effect(cx: &LateContext<'_, '_>, expr: &Expr) -> bool {
         },
         ExprKind::Call(ref callee, ref args) => {
             if let ExprKind::Path(ref qpath) = callee.node {
-                let def = cx.tables.qpath_def(qpath, callee.hir_id);
-                match def {
-                    Def::Struct(..) | Def::Variant(..) | Def::Ctor(..) => {
+                let res = cx.tables.qpath_res(qpath, callee.hir_id);
+                match res {
+                    Res::Def(DefKind::Struct, ..) | Res::Def(DefKind::Variant, ..) | Res::Def(DefKind::Ctor(..), _) => {
                         !has_drop(cx, cx.tables.expr_ty(expr)) && args.iter().all(|arg| has_no_effect(cx, arg))
                     },
                     _ => false,
@@ -153,9 +153,11 @@ fn reduce_expression<'a>(cx: &LateContext<'_, '_>, expr: &'a Expr) -> Option<Vec
         },
         ExprKind::Call(ref callee, ref args) => {
             if let ExprKind::Path(ref qpath) = callee.node {
-                let def = cx.tables.qpath_def(qpath, callee.hir_id);
-                match def {
-                    Def::Struct(..) | Def::Variant(..) | Def::Ctor(..) if !has_drop(cx, cx.tables.expr_ty(expr)) => {
+                let res = cx.tables.qpath_res(qpath, callee.hir_id);
+                match res {
+                    Res::Def(DefKind::Struct, ..) | Res::Def(DefKind::Variant, ..) | Res::Def(DefKind::Ctor(..), _)
+                        if !has_drop(cx, cx.tables.expr_ty(expr)) =>
+                    {
                         Some(args.iter().collect())
                     },
                     _ => None,
diff --git a/clippy_lints/src/non_copy_const.rs b/clippy_lints/src/non_copy_const.rs
index 1d947784576ac..79ebf3bd46b32 100644
--- a/clippy_lints/src/non_copy_const.rs
+++ b/clippy_lints/src/non_copy_const.rs
@@ -4,7 +4,7 @@
 
 use std::ptr;
 
-use rustc::hir::def::Def;
+use rustc::hir::def::{DefKind, Res};
 use rustc::hir::*;
 use rustc::lint::{LateContext, LateLintPass, Lint, LintArray, LintPass};
 use rustc::ty::adjustment::Adjust;
@@ -194,8 +194,8 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NonCopyConst {
             }
 
             // Make sure it is a const item.
-            match cx.tables.qpath_def(qpath, expr.hir_id) {
-                Def::Const(_) | Def::AssociatedConst(_) => {},
+            match cx.tables.qpath_res(qpath, expr.hir_id) {
+                Res::Def(DefKind::Const, _) | Res::Def(DefKind::AssociatedConst, _) => {},
                 _ => return,
             };
 
diff --git a/clippy_lints/src/partialeq_ne_impl.rs b/clippy_lints/src/partialeq_ne_impl.rs
index 6a6725b4d10b6..8f4b785339d99 100644
--- a/clippy_lints/src/partialeq_ne_impl.rs
+++ b/clippy_lints/src/partialeq_ne_impl.rs
@@ -36,7 +36,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for PartialEqNeImpl {
             if let ItemKind::Impl(_, _, _, _, Some(ref trait_ref), _, ref impl_items) = item.node;
             if !is_automatically_derived(&*item.attrs);
             if let Some(eq_trait) = cx.tcx.lang_items().eq_trait();
-            if trait_ref.path.def.def_id() == eq_trait;
+            if trait_ref.path.res.def_id() == eq_trait;
             then {
                 for impl_item in impl_items {
                     if impl_item.ident.name == "ne" {
diff --git a/clippy_lints/src/question_mark.rs b/clippy_lints/src/question_mark.rs
index c5388905032c3..9377ff3e3a0b5 100644
--- a/clippy_lints/src/question_mark.rs
+++ b/clippy_lints/src/question_mark.rs
@@ -1,5 +1,5 @@
 use if_chain::if_chain;
-use rustc::hir::def::Def;
+use rustc::hir::def::{DefKind, Res};
 use rustc::hir::*;
 use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
 use rustc::{declare_lint_pass, declare_tool_lint};
@@ -117,7 +117,9 @@ impl QuestionMark {
             },
             ExprKind::Ret(Some(ref expr)) => Self::expression_returns_none(cx, expr),
             ExprKind::Path(ref qp) => {
-                if let Def::Ctor(def_id, def::CtorOf::Variant, _) = cx.tables.qpath_def(qp, expression.hir_id) {
+                if let Res::Def(DefKind::Ctor(def::CtorOf::Variant, def::CtorKind::Const), def_id) =
+                    cx.tables.qpath_res(qp, expression.hir_id)
+                {
                     return cx.match_def_path(def_id, &OPTION_NONE);
                 }
 
diff --git a/clippy_lints/src/regex.rs b/clippy_lints/src/regex.rs
index 2c912741f8ca4..4a437cbcf944f 100644
--- a/clippy_lints/src/regex.rs
+++ b/clippy_lints/src/regex.rs
@@ -110,7 +110,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Regex {
             if let ExprKind::Call(ref fun, ref args) = expr.node;
             if let ExprKind::Path(ref qpath) = fun.node;
             if args.len() == 1;
-            if let Some(def_id) = cx.tables.qpath_def(qpath, fun.hir_id).opt_def_id();
+            if let Some(def_id) = cx.tables.qpath_res(qpath, fun.hir_id).opt_def_id();
             then {
                 if cx.match_def_path(def_id, &paths::REGEX_NEW) ||
                    cx.match_def_path(def_id, &paths::REGEX_BUILDER_NEW) {
diff --git a/clippy_lints/src/replace_consts.rs b/clippy_lints/src/replace_consts.rs
index 4dc5cea450d1c..2130a65ad9446 100644
--- a/clippy_lints/src/replace_consts.rs
+++ b/clippy_lints/src/replace_consts.rs
@@ -1,7 +1,7 @@
 use crate::utils::span_lint_and_sugg;
 use if_chain::if_chain;
 use rustc::hir;
-use rustc::hir::def::Def;
+use rustc::hir::def::{DefKind, Res};
 use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
 use rustc::{declare_lint_pass, declare_tool_lint};
 use rustc_errors::Applicability;
@@ -35,7 +35,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ReplaceConsts {
     fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx hir::Expr) {
         if_chain! {
             if let hir::ExprKind::Path(ref qp) = expr.node;
-            if let Def::Const(def_id) = cx.tables.qpath_def(qp, expr.hir_id);
+            if let Res::Def(DefKind::Const, def_id) = cx.tables.qpath_res(qp, expr.hir_id);
             then {
                 for &(const_path, repl_snip) in REPLACEMENTS {
                     if cx.match_def_path(def_id, const_path) {
diff --git a/clippy_lints/src/serde_api.rs b/clippy_lints/src/serde_api.rs
index f3d4ff35d4876..bb4ebf63066b3 100644
--- a/clippy_lints/src/serde_api.rs
+++ b/clippy_lints/src/serde_api.rs
@@ -23,7 +23,7 @@ declare_lint_pass!(SerdeAPI => [SERDE_API_MISUSE]);
 impl<'a, 'tcx> LateLintPass<'a, 'tcx> for SerdeAPI {
     fn check_item(&mut self, cx: &LateContext<'a, 'tcx>, item: &'tcx Item) {
         if let ItemKind::Impl(_, _, _, _, Some(ref trait_ref), _, ref items) = item.node {
-            let did = trait_ref.path.def.def_id();
+            let did = trait_ref.path.res.def_id();
             if let Some(visit_did) = get_trait_def_id(cx, &paths::SERDE_DE_VISITOR) {
                 if did == visit_did {
                     let mut seen_str = None;
diff --git a/clippy_lints/src/suspicious_trait_impl.rs b/clippy_lints/src/suspicious_trait_impl.rs
index f7de396c38972..d869285eb5899 100644
--- a/clippy_lints/src/suspicious_trait_impl.rs
+++ b/clippy_lints/src/suspicious_trait_impl.rs
@@ -169,7 +169,7 @@ fn check_binop<'a>(
 
     if_chain! {
         if let Some(trait_ref) = trait_ref_of_method(cx, parent_fn);
-        if let Some(idx) = trait_ids.iter().position(|&tid| tid == trait_ref.path.def.def_id());
+        if let Some(idx) = trait_ids.iter().position(|&tid| tid == trait_ref.path.res.def_id());
         if binop != expected_ops[idx];
         then{
             return Some(traits[idx])
diff --git a/clippy_lints/src/temporary_assignment.rs b/clippy_lints/src/temporary_assignment.rs
index e03c6689a1064..81054c0d1f1d3 100644
--- a/clippy_lints/src/temporary_assignment.rs
+++ b/clippy_lints/src/temporary_assignment.rs
@@ -1,6 +1,6 @@
 use crate::utils::is_adjusted;
 use crate::utils::span_lint;
-use rustc::hir::def::Def;
+use rustc::hir::def::{DefKind, Res};
 use rustc::hir::{Expr, ExprKind};
 use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
 use rustc::{declare_lint_pass, declare_tool_lint};
@@ -27,7 +27,7 @@ fn is_temporary(cx: &LateContext<'_, '_>, expr: &Expr) -> bool {
     match &expr.node {
         ExprKind::Struct(..) | ExprKind::Tup(..) => true,
         ExprKind::Path(qpath) => {
-            if let Def::Const(..) = cx.tables.qpath_def(qpath, expr.hir_id) {
+            if let Res::Def(DefKind::Const, ..) = cx.tables.qpath_res(qpath, expr.hir_id) {
                 true
             } else {
                 false
diff --git a/clippy_lints/src/transmute.rs b/clippy_lints/src/transmute.rs
index d2d3d3cedb712..a13b0102fd980 100644
--- a/clippy_lints/src/transmute.rs
+++ b/clippy_lints/src/transmute.rs
@@ -220,7 +220,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Transmute {
     fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, e: &'tcx Expr) {
         if let ExprKind::Call(ref path_expr, ref args) = e.node {
             if let ExprKind::Path(ref qpath) = path_expr.node {
-                if let Some(def_id) = cx.tables.qpath_def(qpath, path_expr.hir_id).opt_def_id() {
+                if let Some(def_id) = cx.tables.qpath_res(qpath, path_expr.hir_id).opt_def_id() {
                     if cx.match_def_path(def_id, &paths::TRANSMUTE) {
                         let from_ty = cx.tables.expr_ty(&args[0]);
                         let to_ty = cx.tables.expr_ty(e);
diff --git a/clippy_lints/src/types.rs b/clippy_lints/src/types.rs
index d69e135341882..03f3292642784 100644
--- a/clippy_lints/src/types.rs
+++ b/clippy_lints/src/types.rs
@@ -216,7 +216,7 @@ fn match_type_parameter(cx: &LateContext<'_, '_>, qpath: &QPath, path: &[&str])
             _ => None,
         });
         if let TyKind::Path(ref qpath) = ty.node;
-        if let Some(did) = cx.tables.qpath_def(qpath, ty.hir_id).opt_def_id();
+        if let Some(did) = cx.tables.qpath_res(qpath, ty.hir_id).opt_def_id();
         if cx.match_def_path(did, path);
         then {
             return true;
@@ -238,8 +238,8 @@ fn check_ty(cx: &LateContext<'_, '_>, hir_ty: &hir::Ty, is_local: bool) {
     match hir_ty.node {
         TyKind::Path(ref qpath) if !is_local => {
             let hir_id = hir_ty.hir_id;
-            let def = cx.tables.qpath_def(qpath, hir_id);
-            if let Some(def_id) = def.opt_def_id() {
+            let res = cx.tables.qpath_res(qpath, hir_id);
+            if let Some(def_id) = res.opt_def_id() {
                 if Some(def_id) == cx.tcx.lang_items().owned_box() {
                     if match_type_parameter(cx, qpath, &paths::VEC) {
                         span_help_and_lint(
@@ -261,8 +261,8 @@ fn check_ty(cx: &LateContext<'_, '_>, hir_ty: &hir::Ty, is_local: bool) {
                         });
                         // ty is now _ at this point
                         if let TyKind::Path(ref ty_qpath) = ty.node;
-                        let def = cx.tables.qpath_def(ty_qpath, ty.hir_id);
-                        if let Some(def_id) = def.opt_def_id();
+                        let res = cx.tables.qpath_res(ty_qpath, ty.hir_id);
+                        if let Some(def_id) = res.opt_def_id();
                         if Some(def_id) == cx.tcx.lang_items().owned_box();
                         // At this point, we know ty is Box<T>, now get T
                         if let Some(ref last) = last_path_segment(ty_qpath).args;
@@ -367,7 +367,7 @@ fn check_ty_rptr(cx: &LateContext<'_, '_>, hir_ty: &hir::Ty, is_local: bool, lt:
     match mut_ty.ty.node {
         TyKind::Path(ref qpath) => {
             let hir_id = mut_ty.ty.hir_id;
-            let def = cx.tables.qpath_def(qpath, hir_id);
+            let def = cx.tables.qpath_res(qpath, hir_id);
             if_chain! {
                 if let Some(def_id) = def.opt_def_id();
                 if Some(def_id) == cx.tcx.lang_items().owned_box();
diff --git a/clippy_lints/src/unwrap.rs b/clippy_lints/src/unwrap.rs
index 720795eace808..9f7cdf9864890 100644
--- a/clippy_lints/src/unwrap.rs
+++ b/clippy_lints/src/unwrap.rs
@@ -144,7 +144,7 @@ impl<'a, 'tcx: 'a> Visitor<'tcx> for UnwrappableVariablesVisitor<'a, 'tcx> {
                 if ["unwrap", "unwrap_err"].contains(&&*method_name.ident.as_str());
                 let call_to_unwrap = method_name.ident.name == "unwrap";
                 if let Some(unwrappable) = self.unwrappables.iter()
-                    .find(|u| u.ident.def == path.def);
+                    .find(|u| u.ident.res == path.res);
                 then {
                     if call_to_unwrap == unwrappable.safe_to_unwrap {
                         span_lint_and_then(
diff --git a/clippy_lints/src/use_self.rs b/clippy_lints/src/use_self.rs
index 5d2194a1396ed..1a0a3474d88b2 100644
--- a/clippy_lints/src/use_self.rs
+++ b/clippy_lints/src/use_self.rs
@@ -1,6 +1,6 @@
 use if_chain::if_chain;
 use rustc::hir;
-use rustc::hir::def::{CtorKind, Def};
+use rustc::hir::def::{CtorKind, DefKind, Res};
 use rustc::hir::intravisit::{walk_item, walk_path, walk_ty, NestedVisitorMap, Visitor};
 use rustc::hir::*;
 use rustc::lint::{in_external_macro, LateContext, LateLintPass, LintArray, LintContext, LintPass};
@@ -86,7 +86,7 @@ impl<'a, 'tcx> Visitor<'tcx> for TraitImplTyVisitor<'a, 'tcx> {
             if impl_ty != trait_ty {
                 if let Some(impl_ty) = impl_ty {
                     if self.item_type == impl_ty {
-                        let is_self_ty = if let def::Def::SelfTy(..) = path.def {
+                        let is_self_ty = if let def::Res::SelfTy(..) = path.res {
                             true
                         } else {
                             false
@@ -221,10 +221,10 @@ struct UseSelfVisitor<'a, 'tcx: 'a> {
 impl<'a, 'tcx> Visitor<'tcx> for UseSelfVisitor<'a, 'tcx> {
     fn visit_path(&mut self, path: &'tcx Path, _id: HirId) {
         if path.segments.last().expect(SEGMENTS_MSG).ident.name != SelfUpper.name() {
-            if self.item_path.def == path.def {
+            if self.item_path.res == path.res {
                 span_use_self_lint(self.cx, path);
-            } else if let Def::Ctor(ctor_did, def::CtorOf::Struct, CtorKind::Fn) = path.def {
-                if self.item_path.def.opt_def_id() == self.cx.tcx.parent(ctor_did) {
+            } else if let Res::Def(DefKind::Ctor(def::CtorOf::Struct, CtorKind::Fn), ctor_did) = path.res {
+                if self.item_path.res.opt_def_id() == self.cx.tcx.parent(ctor_did) {
                     span_use_self_lint(self.cx, path);
                 }
             }
diff --git a/clippy_lints/src/utils/hir_utils.rs b/clippy_lints/src/utils/hir_utils.rs
index d915e8fdedd24..e1ddc69f25ee3 100644
--- a/clippy_lints/src/utils/hir_utils.rs
+++ b/clippy_lints/src/utils/hir_utils.rs
@@ -634,7 +634,7 @@ impl<'a, 'tcx: 'a> SpanlessHash<'a, 'tcx> {
                 self.hash_name(path.ident.name);
             },
         }
-        // self.cx.tables.qpath_def(p, id).hash(&mut self.s);
+        // self.cx.tables.qpath_res(p, id).hash(&mut self.s);
     }
 
     pub fn hash_path(&mut self, p: &Path) {
diff --git a/clippy_lints/src/utils/internal_lints.rs b/clippy_lints/src/utils/internal_lints.rs
index 375e3d2b3f4ea..90e6cc5ebaec0 100644
--- a/clippy_lints/src/utils/internal_lints.rs
+++ b/clippy_lints/src/utils/internal_lints.rs
@@ -1,7 +1,7 @@
 use crate::utils::{match_type, paths, span_help_and_lint, span_lint, walk_ptrs_ty};
 use if_chain::if_chain;
 use rustc::hir;
-use rustc::hir::def::Def;
+use rustc::hir::def::{DefKind, Res};
 use rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc::hir::*;
 use rustc::lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintArray, LintPass};
@@ -120,7 +120,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for LintWithoutLintPass {
         } else if let hir::ItemKind::Impl(.., Some(ref trait_ref), _, ref impl_item_refs) = item.node {
             if_chain! {
                 if let hir::TraitRef{path, ..} = trait_ref;
-                if let Def::Trait(def_id) = path.def;
+                if let Res::Def(DefKind::Trait, def_id) = path.res;
                 if cx.match_def_path(def_id, &paths::LINT_PASS);
                 then {
                     let mut collector = LintCollector {
@@ -178,7 +178,7 @@ fn is_lint_ref_type<'tcx>(cx: &LateContext<'_, 'tcx>, ty: &Ty) -> bool {
     ) = ty.node
     {
         if let TyKind::Path(ref path) = inner.node {
-            if let Def::Struct(def_id) = cx.tables.qpath_def(path, inner.hir_id) {
+            if let Res::Def(DefKind::Struct, def_id) = cx.tables.qpath_res(path, inner.hir_id) {
                 return cx.match_def_path(def_id, &paths::LINT);
             }
         }
diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs
index 868c8b906ad55..56837109877d4 100644
--- a/clippy_lints/src/utils/mod.rs
+++ b/clippy_lints/src/utils/mod.rs
@@ -23,7 +23,7 @@ use std::mem;
 use if_chain::if_chain;
 use matches::matches;
 use rustc::hir;
-use rustc::hir::def::Def;
+use rustc::hir::def::{DefKind, Res};
 use rustc::hir::def_id::{DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
 use rustc::hir::intravisit::{NestedVisitorMap, Visitor};
 use rustc::hir::Node;
@@ -213,7 +213,7 @@ pub fn match_path_ast(path: &ast::Path, segments: &[&str]) -> bool {
 }
 
 /// Gets the definition associated to a path.
-pub fn path_to_def(cx: &LateContext<'_, '_>, path: &[&str]) -> Option<def::Def> {
+pub fn path_to_res(cx: &LateContext<'_, '_>, path: &[&str]) -> Option<(def::Res)> {
     let crates = cx.tcx.crates();
     let krate = crates.iter().find(|&&krate| cx.tcx.crate_name(krate) == path[0]);
     if let Some(krate) = krate {
@@ -233,10 +233,10 @@ pub fn path_to_def(cx: &LateContext<'_, '_>, path: &[&str]) -> Option<def::Def>
             for item in mem::replace(&mut items, Lrc::new(vec![])).iter() {
                 if item.ident.name == *segment {
                     if path_it.peek().is_none() {
-                        return Some(item.def);
+                        return Some(item.res);
                     }
 
-                    items = cx.tcx.item_children(item.def.def_id());
+                    items = cx.tcx.item_children(item.res.def_id());
                     break;
                 }
             }
@@ -248,13 +248,13 @@ pub fn path_to_def(cx: &LateContext<'_, '_>, path: &[&str]) -> Option<def::Def>
 
 /// Convenience function to get the `DefId` of a trait by path.
 pub fn get_trait_def_id(cx: &LateContext<'_, '_>, path: &[&str]) -> Option<DefId> {
-    let def = match path_to_def(cx, path) {
-        Some(def) => def,
+    let res = match path_to_res(cx, path) {
+        Some(res) => res,
         None => return None,
     };
 
-    match def {
-        def::Def::Trait(trait_id) => Some(trait_id),
+    match res {
+        def::Res::Def(DefKind::Trait, trait_id) => Some(trait_id),
         _ => None,
     }
 }
@@ -317,8 +317,8 @@ pub fn has_drop<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, ty: Ty<'tcx>) -> bool {
 }
 
 /// Resolves the definition of a node from its `HirId`.
-pub fn resolve_node(cx: &LateContext<'_, '_>, qpath: &QPath, id: HirId) -> def::Def {
-    cx.tables.qpath_def(qpath, id)
+pub fn resolve_node(cx: &LateContext<'_, '_>, qpath: &QPath, id: HirId) -> Res {
+    cx.tables.qpath_res(qpath, id)
 }
 
 /// Returns the method names and argument list of nested method call expressions that make up
@@ -746,8 +746,8 @@ pub fn is_ctor_function(cx: &LateContext<'_, '_>, expr: &Expr) -> bool {
     if let ExprKind::Call(ref fun, _) = expr.node {
         if let ExprKind::Path(ref qp) = fun.node {
             return matches!(
-                cx.tables.qpath_def(qp, fun.hir_id),
-                def::Def::Variant(..) | def::Def::Ctor(..)
+                cx.tables.qpath_res(qp, fun.hir_id),
+                def::Res::Def(DefKind::Variant, ..) | Res::Def(DefKind::Ctor(..), _)
             );
         }
     }
@@ -758,8 +758,8 @@ pub fn is_ctor_function(cx: &LateContext<'_, '_>, expr: &Expr) -> bool {
 pub fn is_refutable(cx: &LateContext<'_, '_>, pat: &Pat) -> bool {
     fn is_enum_variant(cx: &LateContext<'_, '_>, qpath: &QPath, id: HirId) -> bool {
         matches!(
-            cx.tables.qpath_def(qpath, id),
-            def::Def::Variant(..) | def::Def::Ctor(_, def::CtorOf::Variant, _)
+            cx.tables.qpath_res(qpath, id),
+            def::Res::Def(DefKind::Variant, ..) | Res::Def(DefKind::Ctor(def::CtorOf::Variant, _), _)
         )
     }
 
@@ -831,7 +831,7 @@ pub fn is_self_ty(slf: &hir::Ty) -> bool {
     if_chain! {
         if let TyKind::Path(ref qp) = slf.node;
         if let QPath::Resolved(None, ref path) = *qp;
-        if let Def::SelfTy(..) = path.def;
+        if let Res::SelfTy(..) = path.res;
         then {
             return true
         }
@@ -852,7 +852,7 @@ pub fn is_try(expr: &Expr) -> Option<&Expr> {
             if match_qpath(path, &paths::RESULT_OK[1..]);
             if let PatKind::Binding(_, hir_id, _, None) = pat[0].node;
             if let ExprKind::Path(QPath::Resolved(None, ref path)) = arm.body.node;
-            if let Def::Local(lid) = path.def;
+            if let Res::Local(lid) = path.res;
             if lid == hir_id;
             then {
                 return true;
diff --git a/clippy_lints/src/utils/usage.rs b/clippy_lints/src/utils/usage.rs
index 14711b7fe1b48..4e66da8b19f42 100644
--- a/clippy_lints/src/utils/usage.rs
+++ b/clippy_lints/src/utils/usage.rs
@@ -1,4 +1,4 @@
-use rustc::hir::def::Def;
+use rustc::hir::def::Res;
 use rustc::hir::*;
 use rustc::lint::LateContext;
 use rustc::middle::expr_use_visitor::*;
@@ -29,8 +29,8 @@ pub fn is_potentially_mutated<'a, 'tcx: 'a>(
     expr: &'tcx Expr,
     cx: &'a LateContext<'a, 'tcx>,
 ) -> bool {
-    let id = match variable.def {
-        Def::Local(id) | Def::Upvar(id, ..) => id,
+    let id = match variable.res {
+        Res::Local(id) | Res::Upvar(id, ..) => id,
         _ => return true,
     };
     mutated_variables(expr, cx).map_or(true, |mutated| mutated.contains(&id))