RustPython · youknowone · Jun 30, 2026 · Jun 27, 2026 · Jun 27, 2026 · Jun 27, 2026
diff --git a/Cargo.toml b/Cargo.toml
@@ -49,7 +49,7 @@
 flamescope = { version = "0.1.2", optional = true }

 rustls = { workspace = true, optional = true }
 rustls-graviola = { workspace = true, optional = true }

 [target.'cfg(windows)'.dependencies]
 libc = { workspace = true }
@@ -370,14 +370,17 @@
 significant_drop_in_scrutinee = "warn"
 single_option_map = "warn"
 trait_duplication_in_bounds = "warn"
+tuple_array_conversions = "warn"
 type_repetition_in_bounds = "warn"
 unnecessary_struct_initialization = "warn"
 unused_peekable = "warn"
 unused_rounding = "warn"
 use_self = "warn"
 useless_let_if_seq = "warn"
+while_float = "warn"
 
 # pedantic lints to enforce gradually
+assigning_clones = "warn"
 bool_to_int_with_if = "warn"
 checked_conversions = "warn"
 cloned_instead_of_copied = "warn"
@@ -403,6 +406,7 @@
 iter_filter_is_some = "warn"
 large_futures = "warn"
 large_types_passed_by_value = "warn"
+manual_assert = "warn"
 manual_instant_elapsed = "warn"
 manual_is_variant_and = "warn"
 map_unwrap_or = "warn"

diff --git a/crates/codegen/src/compile.rs b/crates/codegen/src/compile.rs
@@ -2073,7 +2073,7 @@ impl<'warnings> Compiler<'warnings> {
 
     fn expose_annotation_format_parameter(code: &mut CodeObject) {
         if let Some(first) = code.varnames.first_mut() {
-            *first = "format".to_owned();
+            *first = String::from("format");
         }
     }
 

diff --git a/crates/codegen/src/symboltable.rs b/crates/codegen/src/symboltable.rs
@@ -1632,8 +1632,9 @@ impl SymbolTableBuilder {
                     }
 
                     if type_params.is_none() {
-                        self.class_name = prev_class.clone();
+                        self.class_name.clone_from(&prev_class);
                     }
+
                     if let Some(arguments) = arguments {
                         self.scan_expressions(&arguments.args, ExpressionContext::Load)?;
                         for keyword in &arguments.keywords {

diff --git a/crates/common/src/float_ops.rs b/crates/common/src/float_ops.rs
@@ -4,8 +4,8 @@ use num_traits::{Signed, ToPrimitive};
 
 #[must_use]
 pub const fn decompose_float(value: f64) -> (f64, i32) {
-    if 0.0 == value {
-        (0.0, 0i32)
+    if value == 0.0 {
+        (0.0, 0)
     } else {
         let bits = value.to_bits();
         let exponent: i32 = ((bits >> 52) & 0x7ff) as i32 - 1022;

diff --git a/crates/common/src/hash.rs b/crates/common/src/hash.rs
@@ -49,9 +49,7 @@ impl HashSecret {
         let k1 = u64::from_le_bytes(right.try_into().unwrap());
         Self { k0, k1 }
     }
-}
 
-impl HashSecret {
     pub fn hash_value<T: Hash + ?Sized>(&self, data: &T) -> PyHash {
         fix_sentinel(mod_int(self.hash_one(data) as _))
     }
@@ -94,7 +92,7 @@ pub const fn hash_pointer(value: usize) -> PyHash {
 
 #[inline]
 #[must_use]
-pub fn hash_float(value: f64) -> Option<PyHash> {
+pub const fn hash_float(value: f64) -> Option<PyHash> {
     // cpython _Py_HashDouble
     if !value.is_finite() {
         return if value.is_infinite() {
@@ -111,6 +109,8 @@ pub fn hash_float(value: f64) -> Option<PyHash> {
     let mut m = frexp.0;
     let mut e = frexp.1;
     let mut x: PyUHash = 0;
+
+    #[expect(clippy::while_float, reason = "keep this loop like CPython does it")]
     while m != 0.0 {
         x = ((x << 28) & MODULUS) | (x >> (BITS - 28));
         m *= 268_435_456.0; // 2**28
@@ -137,13 +137,14 @@ pub fn hash_float(value: f64) -> Option<PyHash> {
 
 #[must_use]
 pub fn hash_bigint(value: &BigInt) -> PyHash {
-    let ret = match value.to_i64() {
-        Some(i) => mod_int(i),
-        None => (value % MODULUS).to_i64().unwrap_or_else(|| unsafe {
-            // SAFETY: MODULUS < i64::MAX, so value % MODULUS is guaranteed to be in the range of i64
-            core::hint::unreachable_unchecked()
-        }),
+    let ret = if let Some(v) = value.to_i64() {
+        mod_int(v)
+    } else {
+        // SAFETY:
+        // MODULUS < i64::MAX, so value % MODULUS is guaranteed to be in the range of i64
+        unsafe { (value % MODULUS).to_i64().unwrap_unchecked() }
     };
+
     fix_sentinel(ret)
 }
 

diff --git a/crates/jit/src/instructions.rs b/crates/jit/src/instructions.rs
@@ -666,6 +666,11 @@ impl<'a, 'b> FunctionCompiler<'a, 'b> {
             | Instruction::LoadFastBorrowLoadFastBorrow { var_nums } => {
                 let oparg = var_nums.get(arg);
                 let (idx1, idx2) = oparg.indexes();
+
+                #[expect(
+                    clippy::tuple_array_conversions,
+                    reason = "Seems like a false positive"
+                )]
                 for idx in [idx1, idx2] {
                     let local = self.variables[idx]
                         .as_ref()

diff --git a/crates/vm/src/function/builtin.rs b/crates/vm/src/function/builtin.rs
@@ -57,9 +57,10 @@ const fn zst_ref_out_of_thin_air<T: 'static>(x: T) -> &'static T {
     // operation. if T isn't zero-sized, we don't have to worry about it because we'll fail to compile.
     core::mem::forget(x);
     const {
-        if core::mem::size_of::<T>() != 0 {
-            panic!("can't use a non-zero-sized type here")
-        }
+        assert!(
+            core::mem::size_of::<T>() == 0,
+            "can't use a non-zero-sized type here"
+        );
         // SAFETY: we just confirmed that T is zero-sized, so we can
         //         pull a value of it out of thin air.
         unsafe { core::ptr::NonNull::<T>::dangling().as_ref() }

diff --git a/crates/vm/src/getpath.rs b/crates/vm/src/getpath.rs
@@ -121,7 +121,7 @@ pub fn init_path_config(settings: &Settings) -> Paths {
     //   - sys.executable should be the launcher path (where user invoked Python)
     //   - sys._base_executable should be the real Python executable
     let exe_dir = if let Ok(launcher) = crate::host_env::os::var("__PYVENV_LAUNCHER__") {
-        paths.executable = launcher.clone();
+        paths.executable.clone_from(&launcher);
         paths.base_executable = real_executable;
         PathBuf::from(&launcher).parent().map(PathBuf::from)
     } else {
@@ -152,7 +152,7 @@ pub fn init_path_config(settings: &Settings) -> Paths {
         paths.base_prefix = calculated_prefix;
     } else {
         // Not in venv: prefix == base_prefix
-        paths.prefix = calculated_prefix.clone();
+        paths.prefix.clone_from(&calculated_prefix);
         paths.base_prefix = calculated_prefix;
     }
 
@@ -163,7 +163,7 @@ pub fn init_path_config(settings: &Settings) -> Paths {
     } else {
         calculate_exec_prefix(search_dir.as_ref(), paths.prefix.as_ref())
     };
-    paths.base_exec_prefix = paths.base_prefix.clone();
+    paths.base_exec_prefix.clone_from(&paths.base_prefix);
 
     // Step 7: Calculate base_executable (if not already set by __PYVENV_LAUNCHER__)
     if paths.base_executable.is_empty() {

diff --git a/crates/vm/src/stdlib/os.rs b/crates/vm/src/stdlib/os.rs
@@ -1795,9 +1795,9 @@ pub(super) mod _os {
     #[cfg(all(unix, not(any(target_os = "redox", target_os = "android"))))]
     #[pyfunction]
     fn getloadavg(vm: &VirtualMachine) -> PyResult<(f64, f64, f64)> {
-        let loadavg = crate::host_env::time::getloadavg()
-            .map_err(|_| vm.new_os_error("Load averages are unobtainable"))?;
-        Ok((loadavg[0], loadavg[1], loadavg[2]))
+        crate::host_env::time::getloadavg()
+            .map(Into::into)
+            .map_err(|_| vm.new_os_error("Load averages are unobtainable"))
     }
 
     #[cfg(unix)]
@@ -1918,7 +1918,6 @@ pub(super) mod _os {
         }
     }
 
-    /// Perform a statvfs system call on the given path.
     #[cfg(all(unix, not(target_os = "redox")))]
     #[pyfunction]
     #[pyfunction(name = "fstatvfs")]

diff --git a/crates/vm/src/types/slot.rs b/crates/vm/src/types/slot.rs
@@ -1667,11 +1667,10 @@ pub trait Initializer: PyPayload {
                             .matches(&class_name_for_debug as &str)
                             .count()
                             == 2;
-                        if double_appearance {
-                            panic!(
-                                "This type `{class_name_for_debug}` doesn't seem to support `init`. Override `slot_init` instead: {msg}"
-                            );
-                        }
+                        assert!(
+                            !double_appearance,
+                            "This type `{class_name_for_debug}` doesn't seem to support `init`. Override `slot_init` instead: {msg}"
+                        )
                     }
                 }
                 return Err(err);

diff --git a/crates/vm/src/vm/mod.rs b/crates/vm/src/vm/mod.rs
@@ -883,9 +883,7 @@ impl VirtualMachine {
     fn initialize(&mut self) {
         flame_guard!("init VirtualMachine");
 
-        if self.initialized {
-            panic!("Double Initialize Error");
-        }
+        assert!(!self.initialized, "Double Initialize Error");
 
         // Initialize main thread ident before any threading operations
         #[cfg(feature = "threading")]

diff --git a/crates/vm/src/vm/vm_new.rs b/crates/vm/src/vm/vm_new.rs
@@ -794,10 +794,10 @@ impl VirtualMachine {
         };
 
         if syntax_error_type.is(self.ctx.exceptions.tab_error) {
-            syntax_error_info.msg = "inconsistent use of tabs and spaces in indentation".to_owned();
-        }
-        if syntax_error_type.is(self.ctx.exceptions.incomplete_input_error) {
-            syntax_error_info.msg = "incomplete input".to_owned();
+            syntax_error_info.msg =
+                String::from("inconsistent use of tabs and spaces in indentation");
+        } else if syntax_error_type.is(self.ctx.exceptions.incomplete_input_error) {
+            syntax_error_info.msg = String::from("incomplete input");
         }
 
         let SyntaxErrorInfo { msg, narrow_caret } = syntax_error_info;