diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -164,16 +164,10 @@
 sudo apt-get -t buster-backports install shellcheck
 ```
 
-If you are modifying Rust files, you will need to install a stable rust version,
-plus a nightly toolchain called "abc-nightly" for formatting:
+If you are modifying Rust files, you will need [rustup](https://rustup.rs), which will download the toolchain used by the project the next time `arc lint` works on modified .rs files (will take some time - once - as it downloads).
 ```bash
-# Install latest stable Rust version
-curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s
-source ~/.cargo/env
-rustup install nightly-2022-06-29
-rustup component add rustfmt --toolchain nightly-2022-06-29
-# Name the nightly toolchain "abc-nightly"
-rustup toolchain link abc-nightly "$(rustc +nightly-2022-06-29 --print sysroot)"
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+source "$HOME/.cargo/env"
 ```
 
 Contributing to the web projects
diff --git a/arcanist/linter/RustfmtLinter.php b/arcanist/linter/RustfmtLinter.php
--- a/arcanist/linter/RustfmtLinter.php
+++ b/arcanist/linter/RustfmtLinter.php
@@ -18,11 +18,7 @@
   }
 
   public function getInstallInstructions() {
-    return pht('You have to install a nightly Rust toolchain for this ' .
-               'linter, and name it "abc-nightly". You can do so via ' .
-               '`rustup install nightly-2022-06-29` and then ' .
-               '`ABC_NIGHTLY="$(rustc +nightly-2022-06-29 --print sysroot)"` ' .
-               'and then `rustup toolchain link abc-nightly "${ABC_NIGHTLY}"`');
+    return pht('You have to install rustup (https://rustup.rs).');
   }
 
   public function getLinterName() {
@@ -39,7 +35,6 @@
 
   protected function getMandatoryFlags() {
     return array(
-      '+abc-nightly',
       '--emit', 'stdout',
       '--unstable-features',
       '--skip-children',
@@ -48,7 +43,7 @@
   }
 
   public function getVersion() {
-    list($err, $stdout, $stderr) = exec_manual('%C +abc-nightly --version',
+    list($err, $stdout, $stderr) = exec_manual('%C --version',
                                                $this->getExecutableCommand());
 
     if ($err) {
diff --git a/rust-toolchain b/rust-toolchain
new file mode 100644
--- /dev/null
+++ b/rust-toolchain
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "nightly-2022-06-29"