From 6a6487f4c58731fe578f97d2a4b9c11c5dee28dc Mon Sep 17 00:00:00 2001
From: Julian Eager <eagr@tutanota.com>
Date: Fri, 22 Dec 2023 14:43:28 +0800
Subject: [PATCH] set msrv to 1.63

---
 latches/Cargo.toml       |  1 +
 latches/build.rs         | 43 ----------------------------------------
 latches/src/lock/stds.rs | 14 -------------
 latches/src/sync/mod.rs  | 12 -----------
 latches/src/task/mod.rs  | 11 ----------
 5 files changed, 1 insertion(+), 80 deletions(-)
 delete mode 100644 latches/build.rs

diff --git a/latches/Cargo.toml b/latches/Cargo.toml
index d2afb7e..aa467f3 100644
--- a/latches/Cargo.toml
+++ b/latches/Cargo.toml
@@ -8,6 +8,7 @@ repository = "https://github.com/mirromutth/latches"
 license = "MIT OR Apache-2.0"
 readme = "../README.md"
 description = "A downward counter (CountDownLatch) which can be used to synchronize threads or coordinate tasks"
+rust-version = "1.63"   # keep in sync with docs
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/latches/build.rs b/latches/build.rs
deleted file mode 100644
index c4a61ca..0000000
--- a/latches/build.rs
+++ /dev/null
@@ -1,43 +0,0 @@
-fn main() {
-    let rustc = std::env::var_os("RUSTC").unwrap_or("rustc".into());
-    let output = std::process::Command::new(rustc)
-        .arg("-vV")
-        .output()
-        .expect("Failed to execute `rustc -vV`");
-
-    if !output.status.success() {
-        return println!(
-            "cargo:warning=latches: Failed `rustc -vV`: {}",
-            String::from_utf8_lossy(&output.stderr)
-        );
-    }
-
-    let output = String::from_utf8_lossy(&output.stdout);
-
-    for line in output.lines() {
-        if let Some(version) = line.strip_prefix("release: ") {
-            if let Some(v) = version_tuple(version) {
-                if v < (1, 63) {
-                    println!("cargo:rustc-cfg=latches_no_const_sync");
-                }
-                return;
-            } else {
-                println!("cargo:warning=latches: Unexpected version: {line}");
-            }
-        }
-    }
-
-    println!("cargo:warning=latches: No version line in `rustc -vV` output");
-}
-
-fn version_tuple(version: &str) -> Option<(u16, u16)> {
-    let mut v = version.splitn(3, '.');
-
-    if let (Some(f), Some(s)) = (v.next(), v.next()) {
-        if let (Ok(major), Ok(minor)) = (f.parse(), s.parse()) {
-            return Some((major, minor));
-        }
-    }
-
-    None
-}
diff --git a/latches/src/lock/stds.rs b/latches/src/lock/stds.rs
index 4200c02..114460c 100644
--- a/latches/src/lock/stds.rs
+++ b/latches/src/lock/stds.rs
@@ -15,18 +15,11 @@ pub(crate) struct EmptyCondvar(Mutex<()>, StdCondvar);
 pub(crate) type CondvarGuard<'a> = MutexGuard<'a, ()>;
 
 impl<T> Mutex<T> {
-    #[cfg(not(latches_no_const_sync))]
     #[must_use]
     #[inline]
     pub(crate) const fn new(t: T) -> Self {
         Self(StdMutex::new(t))
     }
-    #[cfg(latches_no_const_sync)]
-    #[must_use]
-    #[inline]
-    pub(crate) fn new(t: T) -> Self {
-        Self(StdMutex::new(t))
-    }
 
     pub(crate) fn lock(&self) -> MutexGuard<'_, T> {
         match self.0.lock() {
@@ -38,18 +31,11 @@ impl<T> Mutex<T> {
 
 #[cfg(feature = "sync")]
 impl EmptyCondvar {
-    #[cfg(not(latches_no_const_sync))]
     #[must_use]
     #[inline]
     pub(crate) const fn new() -> Self {
         Self(Mutex::new(()), StdCondvar::new())
     }
-    #[cfg(latches_no_const_sync)]
-    #[must_use]
-    #[inline]
-    pub(crate) fn new() -> Self {
-        Self(Mutex::new(()), StdCondvar::new())
-    }
 
     /// Notifies all threads waiting on this condition variable.
     ///
diff --git a/latches/src/sync/mod.rs b/latches/src/sync/mod.rs
index fb127ef..254b3e3 100644
--- a/latches/src/sync/mod.rs
+++ b/latches/src/sync/mod.rs
@@ -114,7 +114,6 @@ impl Latch {
     /// let latch = Latch::new(10);
     /// # drop(latch);
     /// ```
-    #[cfg(not(latches_no_const_sync))]
     #[must_use]
     #[inline]
     pub const fn new(count: usize) -> Self {
@@ -123,17 +122,6 @@ impl Latch {
             cvar: EmptyCondvar::new(),
         }
     }
-    /// Creates a new latch initialized with the given count.
-    #[cfg(latches_no_const_sync)]
-    #[must_use]
-    #[inline]
-    pub fn new(count: usize) -> Self {
-        Self {
-            stat: AtomicUsize::new(count),
-            lock: Mutex::new(()),
-            cvar: Condvar::new(),
-        }
-    }
 
     /// Decrements the latch count, re-enable all waiting threads if the
     /// counter reaches 0 after decrement.
diff --git a/latches/src/task/mod.rs b/latches/src/task/mod.rs
index bacc478..3cef130 100644
--- a/latches/src/task/mod.rs
+++ b/latches/src/task/mod.rs
@@ -113,7 +113,6 @@ impl Latch {
     /// let latch = Latch::new(10);
     /// # drop(latch);
     /// ```
-    #[cfg(not(latches_no_const_sync))]
     #[must_use]
     #[inline]
     pub const fn new(count: usize) -> Self {
@@ -122,16 +121,6 @@ impl Latch {
             lock: Mutex::new(Waiters::new()),
         }
     }
-    /// Creates a new latch initialized with the given count.
-    #[cfg(latches_no_const_sync)]
-    #[must_use]
-    #[inline]
-    pub fn new(count: usize) -> Self {
-        Self {
-            stat: AtomicUsize::new(count),
-            lock: Mutex::new(Waiters::new()),
-        }
-    }
 
     /// Decrements the latch count, wake up all pending tasks if the counter
     /// reaches 0 after decrement.