diff --git a/library/backtrace b/library/backtrace
index af078ecc0b069..8b8ea53b56f51 160000
--- a/library/backtrace
+++ b/library/backtrace
@@ -1 +1 @@
-Subproject commit af078ecc0b069ec594982f92d4c6c58af99efbb5
+Subproject commit 8b8ea53b56f519dd7780defdd4254daaec892584
diff --git a/library/std/src/backtrace.rs b/library/std/src/backtrace.rs
index 95e18ef2a6543..aeaa5b7002021 100644
--- a/library/std/src/backtrace.rs
+++ b/library/std/src/backtrace.rs
@@ -103,6 +103,7 @@ use crate::sync::atomic::{AtomicUsize, Ordering::SeqCst};
 use crate::sync::Once;
 use crate::sys_common::backtrace::{lock, output_filename};
 use crate::vec::Vec;
+use crate::marker::PhantomData;
 
 /// A captured OS thread stack backtrace.
 ///
@@ -147,17 +148,31 @@ fn _assert_send_sync() {
     _assert::<Backtrace>();
 }
 
-struct BacktraceFrame {
+/// A single frame of a backtrace.
+#[derive(Debug)]
+#[unstable(feature = "backtrace_frames", issue = "79676")]
+pub struct BacktraceFrame {
     frame: RawFrame,
     symbols: Vec<BacktraceSymbol>,
 }
 
+/// An iterator over the frames of a backtrace, created 
+/// by the [`frames`] method on [`Backtrace`].
+#[derive(Debug)]
+#[unstable(feature = "backtrace_frames", issue = "79676")]
+pub struct Frames<'a> {
+    inner: Vec<BacktraceFrame>,
+    _backtrace: PhantomData<&'a Backtrace>
+}
+
+#[derive(Debug, Clone)]
 enum RawFrame {
     Actual(backtrace_rs::Frame),
     #[cfg(test)]
     Fake,
 }
 
+#[derive(Clone)]
 struct BacktraceSymbol {
     name: Option<Vec<u8>>,
     filename: Option<BytesOrWide>,
@@ -165,6 +180,7 @@ struct BacktraceSymbol {
     colno: Option<u32>,
 }
 
+#[derive(Clone)]
 enum BytesOrWide {
     Bytes(Vec<u8>),
     Wide(Vec<u16>),
@@ -353,6 +369,25 @@ impl Backtrace {
     }
 }
 
+impl<'a> Backtrace {
+    /// Returns an iterator over the backtrace frames.
+    #[unstable(feature = "backtrace_frames", issue = "79676")]
+    pub fn frames(&self) -> Frames<'a> {
+        if let Inner::Captured(captured) = &self.inner {
+            let frames = &captured.lock().unwrap().frames;
+            Frames {
+                inner: frames.iter().map(|frame| frame.clone()).collect::<Vec<BacktraceFrame>>(),
+                _backtrace: PhantomData
+            }
+        } else {
+            Frames {
+                inner: vec![],
+                _backtrace: PhantomData
+            }
+        }
+    }
+}
+
 impl fmt::Display for Backtrace {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         let capture = match &self.inner {
@@ -476,3 +511,24 @@ impl RawFrame {
         }
     }
 }
+
+#[unstable(feature = "backtrace_frames", issue = "79676")]
+impl<'a> AsRef<[BacktraceFrame]> for Frames<'a> {
+    fn as_ref(&self) -> &[BacktraceFrame] {
+        &self.inner
+    }
+}
+
+
+#[unstable(feature = "backtrace_frames", issue = "79676")]
+impl BacktraceFrame {
+    // Private clone method so that we don't expose a
+    // public BacktraceFrame.clone() by deriving Clone
+    fn clone(&self) -> Self {
+        BacktraceFrame {
+            frame: self.frame.clone(),
+            symbols: self.symbols.clone(),
+        }
+    }
+}
+
diff --git a/library/std/src/backtrace/tests.rs b/library/std/src/backtrace/tests.rs
index 31cf0f702185c..3d65ef1dabe95 100644
--- a/library/std/src/backtrace/tests.rs
+++ b/library/std/src/backtrace/tests.rs
@@ -44,7 +44,12 @@ fn test_debug() {
                 },
             ],
         })),
-    };
+    }
+}
+
+#[test]
+fn test_debug() {
+    let backtrace = generate_fake_backtrace();
 
     #[rustfmt::skip]
     let expected = "Backtrace [\
diff --git a/library/stdarch b/library/stdarch
index 9c732a56f67f5..3c3664355ef46 160000
--- a/library/stdarch
+++ b/library/stdarch
@@ -1 +1 @@
-Subproject commit 9c732a56f67f54d12a0b4fd99993154906c95ea6
+Subproject commit 3c3664355ef46e788b53080e521d6542fbddfd84
diff --git a/src/doc/book b/src/doc/book
index 5bb44f8b5b0aa..13e1c05420bca 160000
--- a/src/doc/book
+++ b/src/doc/book
@@ -1 +1 @@
-Subproject commit 5bb44f8b5b0aa105c8b22602e9b18800484afa21
+Subproject commit 13e1c05420bca86ecc79e4ba5b6d02de9bd53c62
diff --git a/src/doc/embedded-book b/src/doc/embedded-book
index ba34b8a968f95..ca8169e69b479 160000
--- a/src/doc/embedded-book
+++ b/src/doc/embedded-book
@@ -1 +1 @@
-Subproject commit ba34b8a968f9531d38c4dc4411d5568b7c076bfe
+Subproject commit ca8169e69b479f615855d0eece7e318138fcfc00
diff --git a/src/doc/nomicon b/src/doc/nomicon
index a5a48441d411f..23c49f1d5ce47 160000
--- a/src/doc/nomicon
+++ b/src/doc/nomicon
@@ -1 +1 @@
-Subproject commit a5a48441d411f61556b57d762b03d6874afe575d
+Subproject commit 23c49f1d5ce4720bc5b7e3a920f47eccc8da6b63
diff --git a/src/doc/reference b/src/doc/reference
index b278478b76617..a7de763c21329 160000
--- a/src/doc/reference
+++ b/src/doc/reference
@@ -1 +1 @@
-Subproject commit b278478b766178491a8b6f67afa4bcd6b64d977a
+Subproject commit a7de763c213292f5b44bf10acb87ffa38724814d
diff --git a/src/doc/rust-by-example b/src/doc/rust-by-example
index 1cce0737d6a7d..1886fda6981b7 160000
--- a/src/doc/rust-by-example
+++ b/src/doc/rust-by-example
@@ -1 +1 @@
-Subproject commit 1cce0737d6a7d3ceafb139b4a206861fb1dcb2ab
+Subproject commit 1886fda6981b723e4de637074455558f8bc1e83c
diff --git a/src/llvm-project b/src/llvm-project
index f9a8d70b6e036..ee1617457899e 160000
--- a/src/llvm-project
+++ b/src/llvm-project
@@ -1 +1 @@
-Subproject commit f9a8d70b6e0365ac2172ca6b7f1de0341297458d
+Subproject commit ee1617457899ef2eb55dcf7ee2758b4340b6533f
diff --git a/src/tools/cargo b/src/tools/cargo
index 329895f5b52a3..d5556aeb8405b 160000
--- a/src/tools/cargo
+++ b/src/tools/cargo
@@ -1 +1 @@
-Subproject commit 329895f5b52a358e5d9ecb26215708b5cb31d906
+Subproject commit d5556aeb8405b1fe696adb6e297ad7a1f2989b62
diff --git a/src/tools/miri b/src/tools/miri
index a09f8b0c06c6b..30e0c303a0197 160000
--- a/src/tools/miri
+++ b/src/tools/miri
@@ -1 +1 @@
-Subproject commit a09f8b0c06c6bb051bd1e104c6be56fbe51f3d86
+Subproject commit 30e0c303a019737cb0e22db464c774ac66b14e07
diff --git a/src/tools/rls b/src/tools/rls
index 2cf84baa5e3c5..dab1468d6aeed 160000
--- a/src/tools/rls
+++ b/src/tools/rls
@@ -1 +1 @@
-Subproject commit 2cf84baa5e3c55ac02f42919e67440acb5417125
+Subproject commit dab1468d6aeed0e49f7d0569c1d2128b5a7751e0
diff --git a/src/tools/rust-installer b/src/tools/rust-installer
index 5254dbfd25d52..d66f476b4d5e7 160000
--- a/src/tools/rust-installer
+++ b/src/tools/rust-installer
@@ -1 +1 @@
-Subproject commit 5254dbfd25d5284728ab624dca1969d61427a0db
+Subproject commit d66f476b4d5e7fdf1ec215c9ac16c923dc292324
diff --git a/src/tools/rustfmt b/src/tools/rustfmt
index acd94866fd0ff..eb894d5370812 160000
--- a/src/tools/rustfmt
+++ b/src/tools/rustfmt
@@ -1 +1 @@
-Subproject commit acd94866fd0ff5eacb7e184ae21c19e5440fc5fb
+Subproject commit eb894d53708122a67762de9489881c11aa8ce257