diff --git a/src/libcore/str/pattern.rs b/src/libcore/str/pattern.rs
index ef64d8b0fdf..6c826e5dcde 100644
--- a/src/libcore/str/pattern.rs
+++ b/src/libcore/str/pattern.rs
@@ -1050,7 +1050,7 @@ fn new(needle: &[u8], end: usize) -> TwoWaySearcher {
         // &v[..period]. If it is, we use "Algorithm CP1". Otherwise we use
         // "Algorithm CP2", which is optimized for when the period of the needle
         // is large.
-        if &needle[..crit_pos] == &needle[period..period + crit_pos] {
+        if needle[..crit_pos] == needle[period..period + crit_pos] {
             // short period case -- the period is exact
             // compute a separate critical factorization for the reversed needle
             // x = u' v' where |v'| < period(x).
diff --git a/src/librustc/ty/error.rs b/src/librustc/ty/error.rs
index 6c5458e6e58..2599ad8ba7b 100644
--- a/src/librustc/ty/error.rs
+++ b/src/librustc/ty/error.rs
@@ -341,7 +341,7 @@ pub fn note_and_explain_type_err(
                     db.note("distinct uses of `impl Trait` result in different opaque types");
                     let e_str = values.expected.to_string();
                     let f_str = values.found.to_string();
-                    if &e_str == &f_str && &e_str == "impl std::future::Future" {
+                    if e_str == f_str && &e_str == "impl std::future::Future" {
                         // FIXME: use non-string based check.
                         db.help(
                             "if both `Future`s have the same `Output` type, consider \
diff --git a/src/librustc_infer/infer/error_reporting/mod.rs b/src/librustc_infer/infer/error_reporting/mod.rs
index 008658dff42..fd103c4c336 100644
--- a/src/librustc_infer/infer/error_reporting/mod.rs
+++ b/src/librustc_infer/infer/error_reporting/mod.rs
@@ -745,7 +745,7 @@ fn highlight_outer(
             .join(", ");
         if !lifetimes.is_empty() {
             if sub.regions().count() < len {
-                value.push_normal(lifetimes + &", ");
+                value.push_normal(lifetimes + ", ");
             } else {
                 value.push_normal(lifetimes);
             }
diff --git a/src/librustdoc/core.rs b/src/librustdoc/core.rs
index 8c4e65765d3..43d3ad21829 100644
--- a/src/librustdoc/core.rs
+++ b/src/librustdoc/core.rs
@@ -283,7 +283,7 @@ pub fn run_core(options: RustdocOptions) -> (clean::Crate, RenderInfo, RenderOpt
         .filter_map(|lint| {
             // We don't want to whitelist *all* lints so let's
             // ignore those ones.
-            if whitelisted_lints.iter().any(|l| &lint.name == l) {
+            if whitelisted_lints.iter().any(|l| lint.name == l) {
                 None
             } else {
                 Some((lint::LintId::of(lint), lint::Allow))