8 files changed, 3 insertions, 81 deletions

diff --git a/README.md b/README.md
index 714104331..d2a24dfcc 100644
--- a/README.md
+++ b/README.md
@@ -136,14 +136,8 @@ please refer to the `.vscode/settings.json` file's `rust-analyzer.linkedProjects
 
 ## Minimum supported Rust version (MSRV)
 
-Embassy is guaranteed to compile on the latest stable Rust version at the time of release. It might compile with older versions but that may change in any new patch release.
-
-Several features require nightly:
-
-- The `#[embassy_executor::main]` and `#[embassy_executor::task]` attribute macros.
-- Async traits
-
-These are enabled by activating the `nightly` Cargo feature. If you do so, Embassy is guaranteed to compile on the exact nightly version specified in `rust-toolchain.toml`. It might compile with older or newer nightly versions, but that may change in any new patch release.
+Embassy is guaranteed to compile on stable Rust 1.75 and up. It *might*
+compile with older versions but that may change in any new patch release.
 
 ## Why the name?
 
diff --git a/embassy-embedded-hal/build.rs b/embassy-embedded-hal/build.rs
deleted file mode 100644
index 78bd27ec7..000000000
--- a/embassy-embedded-hal/build.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-use std::env;
-use std::ffi::OsString;
-use std::process::Command;
-
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-
-    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
-
-    let output = Command::new(rustc)
-        .arg("--version")
-        .output()
-        .expect("failed to run `rustc --version`");
-
-    if String::from_utf8_lossy(&output.stdout).contains("nightly") {
-        println!("cargo:rustc-cfg=nightly");
-    }
-}
diff --git a/embassy-embedded-hal/src/lib.rs b/embassy-embedded-hal/src/lib.rs
index b40f892f4..ee974324b 100644
--- a/embassy-embedded-hal/src/lib.rs
+++ b/embassy-embedded-hal/src/lib.rs
@@ -1,6 +1,4 @@
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(nightly, feature(async_fn_in_trait, impl_trait_projections))]
-#![cfg_attr(nightly, allow(stable_features, unknown_lints))]
 #![allow(async_fn_in_trait)]
 #![warn(missing_docs)]
 
diff --git a/embassy-net/build.rs b/embassy-net/build.rs
deleted file mode 100644
index 78bd27ec7..000000000
--- a/embassy-net/build.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-use std::env;
-use std::ffi::OsString;
-use std::process::Command;
-
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-
-    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
-
-    let output = Command::new(rustc)
-        .arg("--version")
-        .output()
-        .expect("failed to run `rustc --version`");
-
-    if String::from_utf8_lossy(&output.stdout).contains("nightly") {
-        println!("cargo:rustc-cfg=nightly");
-    }
-}
diff --git a/embassy-sync/build.rs b/embassy-sync/build.rs
index 0a796b881..afd76dad1 100644
--- a/embassy-sync/build.rs
+++ b/embassy-sync/build.rs
@@ -1,21 +1,8 @@
 use std::env;
-use std::ffi::OsString;
-use std::process::Command;
 
 fn main() {
     println!("cargo:rerun-if-changed=build.rs");
 
-    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
-
-    let output = Command::new(rustc)
-        .arg("--version")
-        .output()
-        .expect("failed to run `rustc --version`");
-
-    if String::from_utf8_lossy(&output.stdout).contains("nightly") {
-        println!("cargo:rustc-cfg=nightly");
-    }
-
     let target = env::var("TARGET").unwrap();
 
     if target.starts_with("thumbv6m-") {
diff --git a/embassy-sync/src/lib.rs b/embassy-sync/src/lib.rs
index b0ccfde57..d88c76db5 100644
--- a/embassy-sync/src/lib.rs
+++ b/embassy-sync/src/lib.rs
@@ -1,6 +1,4 @@
 #![cfg_attr(not(any(feature = "std", feature = "wasm")), no_std)]
-#![cfg_attr(nightly, feature(async_fn_in_trait, impl_trait_projections))]
-#![cfg_attr(nightly, allow(stable_features, unknown_lints))]
 #![allow(async_fn_in_trait)]
 #![allow(clippy::new_without_default)]
 #![doc = include_str!("../README.md")]
diff --git a/embassy-time/build.rs b/embassy-time/build.rs
index 78bd27ec7..f328e4d9d 100644
--- a/embassy-time/build.rs
+++ b/embassy-time/build.rs
@@ -1,18 +1 @@
-use std::env;
-use std::ffi::OsString;
-use std::process::Command;
-
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-
-    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
-
-    let output = Command::new(rustc)
-        .arg("--version")
-        .output()
-        .expect("failed to run `rustc --version`");
-
-    if String::from_utf8_lossy(&output.stdout).contains("nightly") {
-        println!("cargo:rustc-cfg=nightly");
-    }
-}
+fn main() {}
diff --git a/embassy-time/src/lib.rs b/embassy-time/src/lib.rs
index a59ee68d2..7e2546f68 100644
--- a/embassy-time/src/lib.rs
+++ b/embassy-time/src/lib.rs
@@ -1,6 +1,4 @@
 #![cfg_attr(not(any(feature = "std", feature = "wasm", test)), no_std)]
-#![cfg_attr(nightly, feature(async_fn_in_trait, impl_trait_projections))]
-#![cfg_attr(nightly, allow(stable_features, unknown_lints))]
 #![allow(async_fn_in_trait)]
 #![doc = include_str!("../README.md")]
 #![allow(clippy::new_without_default)]