diff --git a/library/compiler-builtins/examples/intrinsics.rs b/library/compiler-builtins/examples/intrinsics.rs
index 0ca30c215b33..19bb569b57dc 100644
--- a/library/compiler-builtins/examples/intrinsics.rs
+++ b/library/compiler-builtins/examples/intrinsics.rs
@@ -4,6 +4,7 @@
 // to link due to the missing intrinsic (symbol).
 
 #![allow(unused_features)]
+#![allow(stable_features)] // bench_black_box feature is stable, leaving for backcompat
 #![cfg_attr(thumb, no_main)]
 #![deny(dead_code)]
 #![feature(bench_black_box)]
diff --git a/library/compiler-builtins/src/float/conv.rs b/library/compiler-builtins/src/float/conv.rs
index a27d542fae39..790c0ab9f351 100644
--- a/library/compiler-builtins/src/float/conv.rs
+++ b/library/compiler-builtins/src/float/conv.rs
@@ -3,7 +3,7 @@
 /// These are hand-optimized bit twiddling code,
 /// which unfortunately isn't the easiest kind of code to read.
 ///
-/// The algorithm is explained here: https://blog.m-ou.se/floats/
+/// The algorithm is explained here: <https://blog.m-ou.se/floats/>
 mod int_to_float {
     pub fn u32_to_f32_bits(i: u32) -> u32 {
         if i == 0 {
diff --git a/library/compiler-builtins/src/macros.rs b/library/compiler-builtins/src/macros.rs
index f1e2c533a3f4..b3becde7230c 100644
--- a/library/compiler-builtins/src/macros.rs
+++ b/library/compiler-builtins/src/macros.rs
@@ -33,7 +33,7 @@ macro_rules! public_test_dep {
 ///
 /// This macro is structured to be invoked with a bunch of functions that looks
 /// like:
-///
+/// ```ignore
 ///     intrinsics! {
 ///         pub extern "C" fn foo(a: i32) -> u32 {
 ///             // ...
@@ -44,6 +44,7 @@ macro_rules! public_test_dep {
 ///             // ...
 ///         }
 ///     }
+/// ```
 ///
 /// Each function is defined in a manner that looks like a normal Rust function.
 /// The macro then accepts a few nonstandard attributes that can decorate