diff --git a/clippy_lints/src/escape.rs b/clippy_lints/src/escape.rs
index 6d0a1f673e77..ec1d3a24f036 100644
--- a/clippy_lints/src/escape.rs
+++ b/clippy_lints/src/escape.rs
@@ -3,6 +3,7 @@ use rustc::ty::{self, Ty};
 use rustc_hir::intravisit as visit;
 use rustc_hir::HirIdSet;
 use rustc_hir::{self, *};
+use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::source_map::Span;
diff --git a/clippy_lints/src/len_zero.rs b/clippy_lints/src/len_zero.rs
index 2d381148012c..b1ed88f59d4a 100644
--- a/clippy_lints/src/len_zero.rs
+++ b/clippy_lints/src/len_zero.rs
@@ -134,7 +134,7 @@ fn check_trait_items(cx: &LateContext<'_, '_>, visited_trait: &Item<'_>, trait_i
     // fill the set with current and super traits
     fn fill_trait_set(traitt: DefId, set: &mut FxHashSet<DefId>, cx: &LateContext<'_, '_>) {
         if set.insert(traitt) {
-            for supertrait in rustc::traits::supertrait_def_ids(cx.tcx, traitt) {
+            for supertrait in rustc_infer::traits::supertrait_def_ids(cx.tcx, traitt) {
                 fill_trait_set(supertrait, set, cx);
             }
         }
diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs
index a641ff777871..1cf01d2e02e5 100644
--- a/clippy_lints/src/lib.rs
+++ b/clippy_lints/src/lib.rs
@@ -33,6 +33,8 @@ extern crate rustc_hir;
 #[allow(unused_extern_crates)]
 extern crate rustc_index;
 #[allow(unused_extern_crates)]
+extern crate rustc_infer;
+#[allow(unused_extern_crates)]
 extern crate rustc_lexer;
 #[allow(unused_extern_crates)]
 extern crate rustc_lint;
diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs
index 1aea630efe4e..3eee2728ce2c 100644
--- a/clippy_lints/src/loops.rs
+++ b/clippy_lints/src/loops.rs
@@ -21,6 +21,7 @@ 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::*;
+use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
diff --git a/clippy_lints/src/needless_pass_by_value.rs b/clippy_lints/src/needless_pass_by_value.rs
index 7bf7f21dd54e..7a0f3bdd3558 100644
--- a/clippy_lints/src/needless_pass_by_value.rs
+++ b/clippy_lints/src/needless_pass_by_value.rs
@@ -5,13 +5,14 @@ use crate::utils::{
 };
 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_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_errors::{Applicability, DiagnosticBuilder};
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::*;
+use rustc_infer::infer::TyCtxtInferExt;
+use rustc_infer::traits;
+use rustc_infer::traits::misc::can_type_implement_copy;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::{Span, Symbol};
diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs
index ed6d9f81cc9f..b13648afda9e 100644
--- a/clippy_lints/src/utils/mod.rs
+++ b/clippy_lints/src/utils/mod.rs
@@ -27,7 +27,6 @@ use if_chain::if_chain;
 use matches::matches;
 use rustc::hir::map::Map;
 use rustc::traits;
-use rustc::traits::predicate_for_trait_def;
 use rustc::ty::{
     self,
     layout::{self, IntegerExt},
@@ -42,6 +41,8 @@ use rustc_hir::def_id::{DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
 use rustc_hir::intravisit::{NestedVisitorMap, Visitor};
 use rustc_hir::Node;
 use rustc_hir::*;
+use rustc_infer::infer::TyCtxtInferExt;
+use rustc_infer::traits::predicate_for_trait_def;
 use rustc_lint::{LateContext, Level, Lint, LintContext};
 use rustc_span::hygiene::{ExpnKind, MacroKind};
 use rustc_span::source_map::original_sp;
diff --git a/clippy_lints/src/utils/usage.rs b/clippy_lints/src/utils/usage.rs
index 7939d7d0863c..8fff1c7a16cb 100644
--- a/clippy_lints/src/utils/usage.rs
+++ b/clippy_lints/src/utils/usage.rs
@@ -5,6 +5,7 @@ use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::def::Res;
 use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc_hir::*;
+use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::LateContext;
 use rustc_span::symbol::Ident;
 use rustc_typeck::expr_use_visitor::*;