diff --git a/artiq/firmware/libksupport/lib.rs b/artiq/firmware/libksupport/lib.rs
index 4248e1a2d..b38ab0808 100644
--- a/artiq/firmware/libksupport/lib.rs
+++ b/artiq/firmware/libksupport/lib.rs
@@ -112,8 +112,9 @@ macro_rules! println {
 #[path = "../runtime/rpc_queue.rs"]
 mod rpc_queue;
 
+#[no_mangle]
 #[lang = "panic_fmt"]
-extern fn panic_fmt(args: core::fmt::Arguments, file: &'static str, line: u32) -> ! {
+pub extern fn panic_fmt(args: core::fmt::Arguments, file: &'static str, line: u32) -> ! {
     println!("panic at {}:{}: {}", file, line, args);
     send(&RunAborted);
     loop {}
diff --git a/artiq/firmware/libstd_artiq/error.rs b/artiq/firmware/libstd_artiq/error.rs
index df1d76b6c..5e4e0ead1 100644
--- a/artiq/firmware/libstd_artiq/error.rs
+++ b/artiq/firmware/libstd_artiq/error.rs
@@ -49,7 +49,7 @@ use any::TypeId;
 use boxed::Box;
 use cell;
 use fmt::{self, Debug, Display};
-use marker::{Send, Sync, Reflect};
+use marker::{Send, Sync};
 use mem::transmute;
 use num;
 use core::raw::TraitObject;
@@ -57,7 +57,7 @@ use str;
 use string::{self, String};
 
 /// Base functionality for all errors in Rust.
-pub trait Error: Debug + Display + Reflect {
+pub trait Error: Debug + Display {
     /// A short description of the error.
     ///
     /// The description should not contain newlines or sentence-ending
@@ -258,13 +258,13 @@ impl Error for fmt::Error {
     }
 }
 
-impl<'a, T: ?Sized + Reflect> Error for cell::BorrowError<'a, T> {
+impl Error for cell::BorrowError {
     fn description(&self) -> &str {
         "already mutably borrowed"
     }
 }
 
-impl<'a, T: ?Sized + Reflect> Error for cell::BorrowMutError<'a, T> {
+impl Error for cell::BorrowMutError {
     fn description(&self) -> &str {
         "already borrowed"
     }
diff --git a/artiq/firmware/libstd_artiq/io/mod.rs b/artiq/firmware/libstd_artiq/io/mod.rs
index e1ea29969..0159b92a9 100644
--- a/artiq/firmware/libstd_artiq/io/mod.rs
+++ b/artiq/firmware/libstd_artiq/io/mod.rs
@@ -248,7 +248,7 @@
 //! time and may call fewer or more syscalls/library functions.
 
 use core::cmp;
-use rustc_unicode::str as core_str;
+use std_unicode::str as core_str;
 use core::fmt;
 use core::iter::{Iterator};
 use core::marker::Sized;
diff --git a/artiq/firmware/libstd_artiq/lib.rs b/artiq/firmware/libstd_artiq/lib.rs
index 648baa61e..22f55ee25 100644
--- a/artiq/firmware/libstd_artiq/lib.rs
+++ b/artiq/firmware/libstd_artiq/lib.rs
@@ -1,11 +1,10 @@
 #![feature(lang_items, asm, alloc, collections, libc, needs_panic_runtime,
-           question_mark, unicode, reflect_marker, raw, int_error_internals,
-           try_from, try_borrow, macro_reexport, allow_internal_unstable,
-           stmt_expr_attributes)]
+           unicode, raw, int_error_internals, try_from, macro_reexport,
+           allow_internal_unstable, stmt_expr_attributes)]
 #![no_std]
 #![needs_panic_runtime]
 
-extern crate rustc_unicode;
+extern crate std_unicode;
 extern crate alloc_artiq;
 extern crate alloc;
 #[macro_use]
diff --git a/artiq/firmware/runtime/lib.rs b/artiq/firmware/runtime/lib.rs
index bce19d2b0..ee0aa7a5b 100644
--- a/artiq/firmware/runtime/lib.rs
+++ b/artiq/firmware/runtime/lib.rs
@@ -1,6 +1,5 @@
 #![no_std]
-#![feature(libc, const_fn, try_borrow, stmt_expr_attributes, repr_simd, asm,
-           lang_items)]
+#![feature(libc, const_fn, stmt_expr_attributes, repr_simd, asm, lang_items)]
 
 #[macro_use]
 extern crate std_artiq as std;
@@ -46,8 +45,9 @@ pub fn print_fmt(args: self::core::fmt::Arguments) {
     let _ = Console.write_fmt(args);
 }
 
+#[no_mangle]
 #[lang = "panic_fmt"]
-extern fn panic_fmt(args: self::core::fmt::Arguments, file: &'static str, line: u32) -> ! {
+pub extern fn panic_fmt(args: self::core::fmt::Arguments, file: &'static str, line: u32) -> ! {
     let _ = write!(Console, "panic at {}:{}: {}\n", file, line, args);
     let _ = write!(Console, "waiting for debugger...\n");
     unsafe {
diff --git a/artiq/firmware/runtime/mailbox.rs b/artiq/firmware/runtime/mailbox.rs
index 2b1a42cbb..bbf5f302b 100644
--- a/artiq/firmware/runtime/mailbox.rs
+++ b/artiq/firmware/runtime/mailbox.rs
@@ -2,24 +2,24 @@ use core::ptr::{read_volatile, write_volatile};
 use bsp::board;
 
 const MAILBOX: *mut usize = board::mem::MAILBOX_BASE as *mut usize;
-static mut last: usize = 0;
+static mut LAST: usize = 0;
 
 pub unsafe fn send(data: usize) {
-    last = data;
+    LAST = data;
     write_volatile(MAILBOX, data)
 }
 
 pub fn acknowledged() -> bool {
     unsafe {
         let data = read_volatile(MAILBOX);
-        data == 0 || data != last
+        data == 0 || data != LAST
     }
 }
 
 pub fn receive() -> usize {
     unsafe {
         let data = read_volatile(MAILBOX);
-        if data == last {
+        if data == LAST {
             0
         } else {
             if data != 0 {
diff --git a/conda/artiq-kc705-nist_clock/meta.yaml b/conda/artiq-kc705-nist_clock/meta.yaml
index bc56bf200..ba3c3d155 100644
--- a/conda/artiq-kc705-nist_clock/meta.yaml
+++ b/conda/artiq-kc705-nist_clock/meta.yaml
@@ -16,7 +16,7 @@ requirements:
     - misoc 0.5.dev
     - llvm-or1k
     - binutils-or1k-linux >=2.27
-    - rust-core-or1k
+    - rust-core-or1k 1.16.0 11
     - cargo
   run:
     - artiq {{ "{tag} py_{number}+git{hash}".format(tag=environ.get("GIT_DESCRIBE_TAG"), number=environ.get("GIT_DESCRIBE_NUMBER"), hash=environ.get("GIT_DESCRIBE_HASH")[1:]) if "GIT_DESCRIBE_TAG" in environ else "" }}
diff --git a/conda/artiq-kc705-nist_qc2/meta.yaml b/conda/artiq-kc705-nist_qc2/meta.yaml
index 9a0223a9b..ae0c01e72 100644
--- a/conda/artiq-kc705-nist_qc2/meta.yaml
+++ b/conda/artiq-kc705-nist_qc2/meta.yaml
@@ -16,7 +16,7 @@ requirements:
     - misoc 0.5.dev
     - llvm-or1k
     - binutils-or1k-linux >=2.27
-    - rust-core-or1k
+    - rust-core-or1k 1.16.0 11
     - cargo
   run:
     - artiq {{ "{tag} py_{number}+git{hash}".format(tag=environ.get("GIT_DESCRIBE_TAG"), number=environ.get("GIT_DESCRIBE_NUMBER"), hash=environ.get("GIT_DESCRIBE_HASH")[1:]) if "GIT_DESCRIBE_TAG" in environ else "" }}
diff --git a/conda/artiq-kc705-phaser/meta.yaml b/conda/artiq-kc705-phaser/meta.yaml
index e843ec666..219104a4b 100644
--- a/conda/artiq-kc705-phaser/meta.yaml
+++ b/conda/artiq-kc705-phaser/meta.yaml
@@ -17,7 +17,7 @@ requirements:
     - jesd204b 0.2
     - llvm-or1k
     - binutils-or1k-linux >=2.27
-    - rust-core-or1k
+    - rust-core-or1k 1.16.0 11
     - cargo
     - numpy
   run:
diff --git a/conda/artiq-pipistrello-demo/meta.yaml b/conda/artiq-pipistrello-demo/meta.yaml
index d9975d733..c9d0f09d0 100644
--- a/conda/artiq-pipistrello-demo/meta.yaml
+++ b/conda/artiq-pipistrello-demo/meta.yaml
@@ -16,7 +16,7 @@ requirements:
     - misoc 0.5.dev
     - llvm-or1k
     - binutils-or1k-linux >=2.27
-    - rust-core-or1k
+    - rust-core-or1k 1.16.0 11
     - cargo
   run:
     - artiq {{ "{tag} py_{number}+git{hash}".format(tag=environ.get("GIT_DESCRIBE_TAG"), number=environ.get("GIT_DESCRIBE_NUMBER"), hash=environ.get("GIT_DESCRIBE_HASH")[1:]) if "GIT_DESCRIBE_TAG" in environ else "" }}
diff --git a/doc/manual/installing_from_source.rst b/doc/manual/installing_from_source.rst
index 3d5450ce3..5ac2a650a 100644
--- a/doc/manual/installing_from_source.rst
+++ b/doc/manual/installing_from_source.rst
@@ -61,7 +61,7 @@ and the ARTIQ kernels.
 * Install Rust: ::
 
         $ cd ~/artiq-dev
-        $ git clone https://github.com/m-labs/rust
+        $ git clone -b artiq-1.16.0 https://github.com/m-labs/rust
         $ cd rust
         $ git checkout artiq
         $ git submodule update --init
@@ -70,7 +70,7 @@ and the ARTIQ kernels.
         $ ../configure --prefix=/usr/local/rust-or1k --llvm-root=/usr/local/llvm-or1k --disable-manage-submodules
         $ sudo make install -j4
 
-        $ libs="libcore liballoc librustc_unicode libcollections liblibc_mini libunwind"
+        $ libs="libcore liballoc libstd_unicode libcollections liblibc_mini libunwind"
         $ rustc="/usr/local/rust-or1k/bin/rustc --target or1k-unknown-none -g -C target-feature=+mul,+div,+ffl1,+cmov,+addc -C opt-level=s -L ."
         $ destdir="/usr/local/rust-or1k/lib/rustlib/or1k-unknown-none/lib/"
         $ mkdir ../build-or1k