diff --git a/tests/ui/absurd-extreme-comparisons.stderr b/tests/ui/absurd-extreme-comparisons.stderr
index b18a943c557c..c22c7eb75b46 100644
--- a/tests/ui/absurd-extreme-comparisons.stderr
+++ b/tests/ui/absurd-extreme-comparisons.stderr
@@ -141,7 +141,7 @@ error: <-comparison of unit values detected. This will always be false
 LL |     () < {};
    |     ^^^^^^^
    |
-   = note: #[deny(clippy::unit_cmp)] on by default
+   = note: `#[deny(clippy::unit_cmp)]` on by default
 
 error: aborting due to 18 previous errors
 
diff --git a/tests/ui/bit_masks.stderr b/tests/ui/bit_masks.stderr
index 159db0374d29..dc5ad6dfbdff 100644
--- a/tests/ui/bit_masks.stderr
+++ b/tests/ui/bit_masks.stderr
@@ -12,7 +12,7 @@ error: this operation will always return zero. This is likely not the intended o
 LL |     x & 0 == 0;
    |     ^^^^^
    |
-   = note: #[deny(clippy::erasing_op)] on by default
+   = note: `#[deny(clippy::erasing_op)]` on by default
 
 error: incompatible bit mask: `_ & 2` can never be equal to `1`
   --> $DIR/bit_masks.rs:17:5
diff --git a/tests/ui/cstring.stderr b/tests/ui/cstring.stderr
index a2fc07d4af0d..8c86249dc845 100644
--- a/tests/ui/cstring.stderr
+++ b/tests/ui/cstring.stderr
@@ -4,7 +4,7 @@ error: you are getting the inner pointer of a temporary `CString`
 LL |     CString::new("foo").unwrap().as_ptr();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: #[deny(clippy::temporary_cstring_as_ptr)] on by default
+   = note: `#[deny(clippy::temporary_cstring_as_ptr)]` on by default
    = note: that pointer will be invalid outside this expression
 help: assign the `CString` to a variable to extend its lifetime
   --> $DIR/cstring.rs:7:5
diff --git a/tests/ui/derive.stderr b/tests/ui/derive.stderr
index fc87c7d15960..875018961090 100644
--- a/tests/ui/derive.stderr
+++ b/tests/ui/derive.stderr
@@ -4,7 +4,7 @@ error: you are deriving `Hash` but have implemented `PartialEq` explicitly
 LL | #[derive(Hash)]
    |          ^^^^
    |
-   = note: #[deny(clippy::derive_hash_xor_eq)] on by default
+   = note: `#[deny(clippy::derive_hash_xor_eq)]` on by default
 note: `PartialEq` implemented here
   --> $DIR/derive.rs:19:1
    |
diff --git a/tests/ui/drop_bounds.stderr b/tests/ui/drop_bounds.stderr
index cc87913ecb1a..5d360ef30a1d 100644
--- a/tests/ui/drop_bounds.stderr
+++ b/tests/ui/drop_bounds.stderr
@@ -4,7 +4,7 @@ error: Bounds of the form `T: Drop` are useless. Use `std::mem::needs_drop` to d
 LL | fn foo<T: Drop>() {}
    |           ^^^^
    |
-   = note: #[deny(clippy::drop_bounds)] on by default
+   = note: `#[deny(clippy::drop_bounds)]` on by default
 
 error: Bounds of the form `T: Drop` are useless. Use `std::mem::needs_drop` to detect if a type has drop glue.
   --> $DIR/drop_bounds.rs:5:8
diff --git a/tests/ui/for_loop_over_option_result.stderr b/tests/ui/for_loop_over_option_result.stderr
index 5414bfcf9de5..194a0bfec5b3 100644
--- a/tests/ui/for_loop_over_option_result.stderr
+++ b/tests/ui/for_loop_over_option_result.stderr
@@ -30,7 +30,7 @@ error: you are iterating over `Iterator::next()` which is an Option; this will c
 LL |     for x in v.iter().next() {
    |              ^^^^^^^^^^^^^^^
    |
-   = note: #[deny(clippy::iter_next_loop)] on by default
+   = note: `#[deny(clippy::iter_next_loop)]` on by default
 
 error: for loop over `v.iter().next().and(Some(0))`, which is an `Option`. This is more readably written as an `if let` statement.
   --> $DIR/for_loop_over_option_result.rs:31:14
@@ -57,7 +57,7 @@ LL | |         break;
 LL | |     }
    | |_____^
    |
-   = note: #[deny(clippy::never_loop)] on by default
+   = note: `#[deny(clippy::never_loop)]` on by default
 
 error: this loop never actually loops
   --> $DIR/for_loop_over_option_result.rs:53:5
diff --git a/tests/ui/if_same_then_else.stderr b/tests/ui/if_same_then_else.stderr
index fa42afff0be0..d9424334c09c 100644
--- a/tests/ui/if_same_then_else.stderr
+++ b/tests/ui/if_same_then_else.stderr
@@ -236,7 +236,7 @@ error: this `if` has the same condition as a previous if
 LL |     } else if true {
    |               ^^^^
    |
-   = note: #[deny(clippy::ifs_same_cond)] on by default
+   = note: `#[deny(clippy::ifs_same_cond)]` on by default
 note: same as this
   --> $DIR/if_same_then_else.rs:235:8
    |
diff --git a/tests/ui/indexing_slicing.stderr b/tests/ui/indexing_slicing.stderr
index f075de50686d..b2840f7b5ccc 100644
--- a/tests/ui/indexing_slicing.stderr
+++ b/tests/ui/indexing_slicing.stderr
@@ -4,7 +4,7 @@ error: index out of bounds: the len is 4 but the index is 4
 LL |     x[4]; // Ok, let rustc's `const_err` lint handle `usize` indexing on arrays.
    |     ^^^^
    |
-   = note: #[deny(const_err)] on by default
+   = note: `#[deny(const_err)]` on by default
 
 error: index out of bounds: the len is 4 but the index is 8
   --> $DIR/indexing_slicing.rs:19:5
diff --git a/tests/ui/infinite_iter.stderr b/tests/ui/infinite_iter.stderr
index 564c2b43778b..ec30a54d3817 100644
--- a/tests/ui/infinite_iter.stderr
+++ b/tests/ui/infinite_iter.stderr
@@ -111,7 +111,7 @@ error: infinite iteration detected
 LL |         let _: HashSet<i32> = (0..).collect(); // Infinite iter
    |                               ^^^^^^^^^^^^^^^
    |
-   = note: #[deny(clippy::infinite_iter)] on by default
+   = note: `#[deny(clippy::infinite_iter)]` on by default
 
 error: aborting due to 15 previous errors
 
diff --git a/tests/ui/infinite_loop.stderr b/tests/ui/infinite_loop.stderr
index a3fc591c1b16..6f0332fa8c4a 100644
--- a/tests/ui/infinite_loop.stderr
+++ b/tests/ui/infinite_loop.stderr
@@ -4,7 +4,7 @@ error: Variable in the condition are not mutated in the loop body. This either l
 LL |     while y < 10 {
    |           ^^^^^^
    |
-   = note: #[deny(clippy::while_immutable_condition)] on by default
+   = note: `#[deny(clippy::while_immutable_condition)]` on by default
 
 error: Variable in the condition are not mutated in the loop body. This either leads to an infinite or to a never running loop.
   --> $DIR/infinite_loop.rs:28:11
diff --git a/tests/ui/invalid_ref.stderr b/tests/ui/invalid_ref.stderr
index 42a11fe7e5d2..aeef3892dbe7 100644
--- a/tests/ui/invalid_ref.stderr
+++ b/tests/ui/invalid_ref.stderr
@@ -4,7 +4,7 @@ error: reference to zeroed memory
 LL |     let ref_zero: &T = std::mem::zeroed(); // warning
    |                        ^^^^^^^^^^^^^^^^^^
    |
-   = note: #[deny(clippy::invalid_ref)] on by default
+   = note: `#[deny(clippy::invalid_ref)]` on by default
    = help: Creation of a null reference is undefined behavior; see https://doc.rust-lang.org/reference/behavior-considered-undefined.html
 
 error: reference to zeroed memory
diff --git a/tests/ui/lint_without_lint_pass.stderr b/tests/ui/lint_without_lint_pass.stderr
index 9d0b0d627898..0559cee70efb 100644
--- a/tests/ui/lint_without_lint_pass.stderr
+++ b/tests/ui/lint_without_lint_pass.stderr
@@ -13,7 +13,7 @@ note: lint level defined here
    |
 LL | #![deny(clippy::internal)]
    |         ^^^^^^^^^^^^^^^^
-   = note: #[deny(clippy::lint_without_lint_pass)] implied by #[deny(clippy::internal)]
+   = note: `#[deny(clippy::lint_without_lint_pass)]` implied by `#[deny(clippy::internal)]`
    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
 
 error: aborting due to previous error
diff --git a/tests/ui/match_bool.stderr b/tests/ui/match_bool.stderr
index 193e6c17238b..5c65d2fed3da 100644
--- a/tests/ui/match_bool.stderr
+++ b/tests/ui/match_bool.stderr
@@ -83,7 +83,7 @@ error: equal expressions as operands to `&&`
 LL |     match test && test {
    |           ^^^^^^^^^^^^
    |
-   = note: #[deny(clippy::eq_op)] on by default
+   = note: `#[deny(clippy::eq_op)]` on by default
 
 error: you seem to be trying to match on a boolean expression
   --> $DIR/match_bool.rs:36:5
diff --git a/tests/ui/mistyped_literal_suffix.stderr b/tests/ui/mistyped_literal_suffix.stderr
index c3fed6ae8fdc..17c8b3230273 100644
--- a/tests/ui/mistyped_literal_suffix.stderr
+++ b/tests/ui/mistyped_literal_suffix.stderr
@@ -4,7 +4,7 @@ error: mistyped literal suffix
 LL |     let fail14 = 2_32;
    |                  ^^^^ help: did you mean to write: `2_i32`
    |
-   = note: #[deny(clippy::mistyped_literal_suffixes)] on by default
+   = note: `#[deny(clippy::mistyped_literal_suffixes)]` on by default
 
 error: mistyped literal suffix
   --> $DIR/mistyped_literal_suffix.rs:7:18
diff --git a/tests/ui/never_loop.stderr b/tests/ui/never_loop.stderr
index 416e14d676e7..c00b4c78cf28 100644
--- a/tests/ui/never_loop.stderr
+++ b/tests/ui/never_loop.stderr
@@ -10,7 +10,7 @@ LL | |         break;
 LL | |     }
    | |_____^
    |
-   = note: #[deny(clippy::never_loop)] on by default
+   = note: `#[deny(clippy::never_loop)]` on by default
 
 error: this loop never actually loops
   --> $DIR/never_loop.rs:32:5
diff --git a/tests/ui/non_copy_const.stderr b/tests/ui/non_copy_const.stderr
index 1276491127ad..634933eac618 100644
--- a/tests/ui/non_copy_const.stderr
+++ b/tests/ui/non_copy_const.stderr
@@ -6,7 +6,7 @@ LL | const ATOMIC: AtomicUsize = AtomicUsize::new(5); //~ ERROR interior mutable
    | |
    | help: make this a static item: `static`
    |
-   = note: #[deny(clippy::declare_interior_mutable_const)] on by default
+   = note: `#[deny(clippy::declare_interior_mutable_const)]` on by default
 
 error: a const item should never be interior mutable
   --> $DIR/non_copy_const.rs:11:1
@@ -132,7 +132,7 @@ error: a const item with interior mutability should not be borrowed
 LL |     ATOMIC.store(1, Ordering::SeqCst); //~ ERROR interior mutability
    |     ^^^^^^
    |
-   = note: #[deny(clippy::borrow_interior_mutable_const)] on by default
+   = note: `#[deny(clippy::borrow_interior_mutable_const)]` on by default
    = help: assign this const to a local or static variable, and use the variable here
 
 error: a const item with interior mutability should not be borrowed
diff --git a/tests/ui/out_of_bounds_indexing/empty_array.stderr b/tests/ui/out_of_bounds_indexing/empty_array.stderr
index 2372bf860c52..cda78a47ec73 100644
--- a/tests/ui/out_of_bounds_indexing/empty_array.stderr
+++ b/tests/ui/out_of_bounds_indexing/empty_array.stderr
@@ -4,7 +4,7 @@ error: index out of bounds: the len is 0 but the index is 0
 LL |     empty[0];
    |     ^^^^^^^^
    |
-   = note: #[deny(const_err)] on by default
+   = note: `#[deny(const_err)]` on by default
 
 error: range is out of bounds
   --> $DIR/empty_array.rs:7:12
diff --git a/tests/ui/outer_expn_info.stderr b/tests/ui/outer_expn_info.stderr
index 2bd3a9835457..d9efc91da8e4 100644
--- a/tests/ui/outer_expn_info.stderr
+++ b/tests/ui/outer_expn_info.stderr
@@ -9,7 +9,7 @@ note: lint level defined here
    |
 LL | #![deny(clippy::internal)]
    |         ^^^^^^^^^^^^^^^^
-   = note: #[deny(clippy::outer_expn_info)] implied by #[deny(clippy::internal)]
+   = note: `#[deny(clippy::outer_expn_info)]` implied by `#[deny(clippy::internal)]`
 
 error: aborting due to previous error
 
diff --git a/tests/ui/proc_macro.stderr b/tests/ui/proc_macro.stderr
index ec19cd8fc5fb..78c3880db499 100644
--- a/tests/ui/proc_macro.stderr
+++ b/tests/ui/proc_macro.stderr
@@ -4,7 +4,7 @@ error: approximate value of `f{32, 64}::consts::PI` found. Consider using it dir
 LL |     let _x = 3.14;
    |              ^^^^
    |
-   = note: #[deny(clippy::approx_constant)] on by default
+   = note: `#[deny(clippy::approx_constant)]` on by default
 
 error: aborting due to previous error
 
diff --git a/tests/ui/suspicious_arithmetic_impl.stderr b/tests/ui/suspicious_arithmetic_impl.stderr
index f818f7b3d956..e8a6efc4c4d2 100644
--- a/tests/ui/suspicious_arithmetic_impl.stderr
+++ b/tests/ui/suspicious_arithmetic_impl.stderr
@@ -12,7 +12,7 @@ error: Suspicious use of binary operator in `AddAssign` impl
 LL |         *self = *self - other;
    |                       ^
    |
-   = note: #[deny(clippy::suspicious_op_assign_impl)] on by default
+   = note: `#[deny(clippy::suspicious_op_assign_impl)]` on by default
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/unnecessary_clone.stderr b/tests/ui/unnecessary_clone.stderr
index 8d5d54e7de67..79b99ff1d1d2 100644
--- a/tests/ui/unnecessary_clone.stderr
+++ b/tests/ui/unnecessary_clone.stderr
@@ -68,7 +68,7 @@ error: using `clone` on a double-reference; this will copy the reference instead
 LL |     let z: &Vec<_> = y.clone();
    |                      ^^^^^^^^^
    |
-   = note: #[deny(clippy::clone_double_ref)] on by default
+   = note: `#[deny(clippy::clone_double_ref)]` on by default
 help: try dereferencing it
    |
 LL |     let z: &Vec<_> = &(*y).clone();
diff --git a/tests/ui/zero_div_zero.stderr b/tests/ui/zero_div_zero.stderr
index 763859f54fb2..c599da8baf9b 100644
--- a/tests/ui/zero_div_zero.stderr
+++ b/tests/ui/zero_div_zero.stderr
@@ -4,7 +4,7 @@ error: equal expressions as operands to `/`
 LL |     let nan = 0.0 / 0.0;
    |               ^^^^^^^^^
    |
-   = note: #[deny(clippy::eq_op)] on by default
+   = note: `#[deny(clippy::eq_op)]` on by default
 
 error: constant division of 0.0 with 0.0 will always result in NaN
   --> $DIR/zero_div_zero.rs:4:15