diff --git a/clippy_lints/src/assertions_on_constants.rs b/clippy_lints/src/assertions_on_constants.rs
index 6c24ccfc323..ee4f9292550 100644
--- a/clippy_lints/src/assertions_on_constants.rs
+++ b/clippy_lints/src/assertions_on_constants.rs
@@ -130,7 +130,7 @@ fn match_assert_with_message<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &'tcx E
         if let Some(begin_panic_call) = &inner_block.expr;
         // function call
         if let Some(args) = match_function_call(cx, begin_panic_call, &paths::BEGIN_PANIC);
-        if args.len() == 2;
+        if args.len() == 1;
         // bind the second argument of the `assert!` macro if it exists
         if let panic_message = snippet_opt(cx, args[0].span);
         // second argument of begin_panic is irrelevant
diff --git a/clippy_lints/src/escape.rs b/clippy_lints/src/escape.rs
index 0788b4c9021..695f00396a9 100644
--- a/clippy_lints/src/escape.rs
+++ b/clippy_lints/src/escape.rs
@@ -1,10 +1,10 @@
 use rustc::hir::intravisit as visit;
+use rustc::hir::HirIdSet;
 use rustc::hir::{self, *};
 use rustc::impl_lint_pass;
 use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
 use rustc::ty::layout::LayoutOf;
 use rustc::ty::{self, Ty};
-use rustc::util::nodemap::HirIdSet;
 use rustc_session::declare_tool_lint;
 use rustc_span::source_map::Span;
 use rustc_typeck::expr_use_visitor::*;
diff --git a/clippy_lints/src/new_without_default.rs b/clippy_lints/src/new_without_default.rs
index d594e85a84a..34ff57fa297 100644
--- a/clippy_lints/src/new_without_default.rs
+++ b/clippy_lints/src/new_without_default.rs
@@ -4,10 +4,10 @@
 use if_chain::if_chain;
 use rustc::hir;
 use rustc::hir::def_id::DefId;
+use rustc::hir::HirIdSet;
 use rustc::impl_lint_pass;
 use rustc::lint::{in_external_macro, LateContext, LateLintPass, LintArray, LintContext, LintPass};
 use rustc::ty::{self, Ty};
-use rustc::util::nodemap::HirIdSet;
 use rustc_errors::Applicability;
 use rustc_session::declare_tool_lint;
 use rustc_span::source_map::Span;
diff --git a/clippy_lints/src/panic_unimplemented.rs b/clippy_lints/src/panic_unimplemented.rs
index 93c0cbff07a..007b49cbf90 100644
--- a/clippy_lints/src/panic_unimplemented.rs
+++ b/clippy_lints/src/panic_unimplemented.rs
@@ -98,7 +98,7 @@ fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) {
             if let ExprKind::Block(ref block, _) = expr.kind;
             if let Some(ref ex) = block.expr;
             if let Some(params) = match_function_call(cx, ex, &paths::BEGIN_PANIC);
-            if params.len() == 2;
+            if params.len() == 1;
             then {
                 if is_expn_of(expr.span, "unimplemented").is_some() {
                     let span = get_outer_span(expr);