3 files changed, 5 insertions, 0 deletions
diff --git a/src/libcore/str/lossy.rs b/src/libcore/str/lossy.rs
index e8f747f1a67..762de0489a9 100644
--- a/src/libcore/str/lossy.rs
+++ b/src/libcore/str/lossy.rs
@@ -3,6 +3,8 @@ use crate::str as core_str;
 use crate::fmt::{self, Write};
 use crate::mem;
 
+// ignore-tidy-undocumented-unsafe
+
 /// Lossy UTF-8 string.
 #[unstable(feature = "str_internals", issue = "0")]
 pub struct Utf8Lossy {
diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs
index 1968919f554..25b7eec5b33 100644
--- a/src/libcore/str/mod.rs
+++ b/src/libcore/str/mod.rs
@@ -1,4 +1,5 @@
 // ignore-tidy-filelength
+// ignore-tidy-undocumented-unsafe
 
 //! String manipulation.
 //!
diff --git a/src/libcore/str/pattern.rs b/src/libcore/str/pattern.rs
index ad9d956fda1..a494274118a 100644
--- a/src/libcore/str/pattern.rs
+++ b/src/libcore/str/pattern.rs
@@ -3,6 +3,8 @@
 //! For more details, see the traits [`Pattern`], [`Searcher`],
 //! [`ReverseSearcher`], and [`DoubleEndedSearcher`].
 
+// ignore-tidy-undocumented-unsafe
+
 #![unstable(feature = "pattern",
             reason = "API not fully fleshed out and ready to be stabilized",
             issue = "27721")]