RustPython · youknowone · Jul 4, 2025 · Jul 3, 2025 · Jul 3, 2025 · Jul 3, 2025
diff --git a/common/src/cformat.rs b/common/src/cformat.rs
@@ -136,7 +136,7 @@ bitflags! {
 
 impl CConversionFlags {
     #[inline]
-    pub fn sign_string(&self) -> &'static str {
+    pub const fn sign_string(&self) -> &'static str {
         if self.contains(Self::SIGN_CHAR) {
             "+"
         } else if self.contains(Self::BLANK_SIGN) {

diff --git a/common/src/encodings.rs b/common/src/encodings.rs
@@ -137,7 +137,11 @@ struct DecodeError<'a> {
 
 /// # Safety
 /// `v[..valid_up_to]` must be valid utf8
-unsafe fn make_decode_err(v: &[u8], valid_up_to: usize, err_len: Option<usize>) -> DecodeError<'_> {
+const unsafe fn make_decode_err(
+    v: &[u8],
+    valid_up_to: usize,
+    err_len: Option<usize>,
+) -> DecodeError<'_> {
     let (valid_prefix, rest) = unsafe { v.split_at_unchecked(valid_up_to) };
     let valid_prefix = unsafe { core::str::from_utf8_unchecked(valid_prefix) };
     DecodeError {

diff --git a/common/src/hash.rs b/common/src/hash.rs
@@ -164,7 +164,7 @@ pub fn lcg_urandom(mut x: u32, buf: &mut [u8]) {
 }
 
 #[inline]
-pub fn hash_object_id_raw(p: usize) -> PyHash {
+pub const fn hash_object_id_raw(p: usize) -> PyHash {
     // TODO: Use commented logic when below issue resolved.
     // Ref: https://github.com/RustPython/RustPython/pull/3951#issuecomment-1193108966
 
@@ -175,7 +175,7 @@ pub fn hash_object_id_raw(p: usize) -> PyHash {
 }
 
 #[inline]
-pub fn hash_object_id(p: usize) -> PyHash {
+pub const fn hash_object_id(p: usize) -> PyHash {
     fix_sentinel(hash_object_id_raw(p))
 }
 

diff --git a/common/src/linked_list.rs b/common/src/linked_list.rs
@@ -193,7 +193,7 @@ impl<L: Link> LinkedList<L, L::Target> {
     // }
 
     /// Returns whether the linked list does not contain any node
-    pub fn is_empty(&self) -> bool {
+    pub const fn is_empty(&self) -> bool {
         self.head.is_none()
         // if self.head.is_some() {
         //     return false;
@@ -284,7 +284,7 @@ pub struct DrainFilter<'a, T: Link, F> {
 }
 
 impl<T: Link> LinkedList<T, T::Target> {
-    pub fn drain_filter<F>(&mut self, filter: F) -> DrainFilter<'_, T, F>
+    pub const fn drain_filter<F>(&mut self, filter: F) -> DrainFilter<'_, T, F>
     where
         F: FnMut(&mut T::Target) -> bool,
     {
@@ -323,7 +323,7 @@ where
 
 impl<T> Pointers<T> {
     /// Create a new set of empty pointers
-    pub fn new() -> Self {
+    pub const fn new() -> Self {
         Self {
             inner: UnsafeCell::new(PointersInner {
                 prev: None,
@@ -333,15 +333,15 @@ impl<T> Pointers<T> {
         }
     }
 
-    fn get_prev(&self) -> Option<NonNull<T>> {
+    const fn get_prev(&self) -> Option<NonNull<T>> {
         // SAFETY: prev is the first field in PointersInner, which is #[repr(C)].
         unsafe {
             let inner = self.inner.get();
             let prev = inner as *const Option<NonNull<T>>;
             ptr::read(prev)
         }
     }
-    fn get_next(&self) -> Option<NonNull<T>> {
+    const fn get_next(&self) -> Option<NonNull<T>> {
         // SAFETY: next is the second field in PointersInner, which is #[repr(C)].
         unsafe {
             let inner = self.inner.get();
@@ -351,15 +351,15 @@ impl<T> Pointers<T> {
         }
     }
 
-    fn set_prev(&mut self, value: Option<NonNull<T>>) {
+    const fn set_prev(&mut self, value: Option<NonNull<T>>) {
         // SAFETY: prev is the first field in PointersInner, which is #[repr(C)].
         unsafe {
             let inner = self.inner.get();
             let prev = inner as *mut Option<NonNull<T>>;
             ptr::write(prev, value);
         }
     }
-    fn set_next(&mut self, value: Option<NonNull<T>>) {
+    const fn set_next(&mut self, value: Option<NonNull<T>>) {
         // SAFETY: next is the second field in PointersInner, which is #[repr(C)].
         unsafe {
             let inner = self.inner.get();

diff --git a/common/src/lock/thread_mutex.rs b/common/src/lock/thread_mutex.rs
@@ -78,7 +78,7 @@ pub struct ThreadMutex<R: RawMutex, G: GetThreadId, T: ?Sized> {
 }
 
 impl<R: RawMutex, G: GetThreadId, T> ThreadMutex<R, G, T> {
-    pub fn new(val: T) -> Self {
+    pub const fn new(val: T) -> Self {
         Self {
             raw: RawThreadMutex::INIT,
             data: UnsafeCell::new(val),

diff --git a/compiler/codegen/src/compile.rs b/compiler/codegen/src/compile.rs
@@ -282,7 +282,7 @@ impl Default for PatternContext {
 }
 
 impl PatternContext {
-    pub fn new() -> Self {
+    pub const fn new() -> Self {
         Self {
             stores: Vec::new(),
             allow_irrefutable: false,
@@ -4118,7 +4118,7 @@ impl Compiler<'_> {
         code.current_block = block;
     }
 
-    fn set_source_range(&mut self, range: TextRange) {
+    const fn set_source_range(&mut self, range: TextRange) {
         self.current_source_range = range;
     }
 

diff --git a/compiler/codegen/src/string_parser.rs b/compiler/codegen/src/string_parser.rs
@@ -28,7 +28,7 @@ struct StringParser {
 }
 
 impl StringParser {
-    fn new(source: Box<str>, flags: AnyStringFlags) -> Self {
+    const fn new(source: Box<str>, flags: AnyStringFlags) -> Self {
         Self {
             source,
             cursor: 0,

diff --git a/compiler/codegen/src/symboltable.rs b/compiler/codegen/src/symboltable.rs
@@ -162,18 +162,18 @@ impl Symbol {
         }
     }
 
-    pub fn is_global(&self) -> bool {
+    pub const fn is_global(&self) -> bool {
         matches!(
             self.scope,
             SymbolScope::GlobalExplicit | SymbolScope::GlobalImplicit
         )
     }
 
-    pub fn is_local(&self) -> bool {
+    pub const fn is_local(&self) -> bool {
         matches!(self.scope, SymbolScope::Local | SymbolScope::Cell)
     }
 
-    pub fn is_bound(&self) -> bool {
+    pub const fn is_bound(&self) -> bool {
         self.flags.intersects(SymbolFlags::BOUND)
     }
 }

diff --git a/compiler/codegen/src/unparse.rs b/compiler/codegen/src/unparse.rs
@@ -32,7 +32,7 @@ struct Unparser<'a, 'b, 'c> {
     source: &'c SourceCode<'c>,
 }
 impl<'a, 'b, 'c> Unparser<'a, 'b, 'c> {
-    fn new(f: &'b mut fmt::Formatter<'a>, source: &'c SourceCode<'c>) -> Self {
+    const fn new(f: &'b mut fmt::Formatter<'a>, source: &'c SourceCode<'c>) -> Self {
         Unparser { f, source }
     }
 
@@ -602,7 +602,7 @@ pub struct UnparseExpr<'a> {
     source: &'a SourceCode<'a>,
 }
 
-pub fn unparse_expr<'a>(expr: &'a Expr, source: &'a SourceCode<'a>) -> UnparseExpr<'a> {
+pub const fn unparse_expr<'a>(expr: &'a Expr, source: &'a SourceCode<'a>) -> UnparseExpr<'a> {
     UnparseExpr { expr, source }
 }
 

diff --git a/compiler/src/lib.rs b/compiler/src/lib.rs
@@ -62,7 +62,7 @@ impl CompileError {
         }
     }
 
-    pub fn python_location(&self) -> (usize, usize) {
+    pub const fn python_location(&self) -> (usize, usize) {
         match self {
             Self::Codegen(codegen_error) => {
                 if let Some(location) = &codegen_error.location {

diff --git a/stdlib/src/array.rs b/stdlib/src/array.rs
@@ -89,26 +89,26 @@ mod array {
                     }
                 }
 
-                fn typecode(&self) -> char {
+                const fn typecode(&self) -> char {
                     match self {
                         $(ArrayContentType::$n(_) => $c,)*
                     }
                 }
 
-                fn typecode_str(&self) -> &'static str {
+                const fn typecode_str(&self) -> &'static str {
                     match self {
                         $(ArrayContentType::$n(_) => $scode,)*
                     }
                 }
 
-                fn itemsize_of_typecode(c: char) -> Option<usize> {
+                const fn itemsize_of_typecode(c: char) -> Option<usize> {
                     match c {
                         $($c => Some(std::mem::size_of::<$t>()),)*
                         _ => None,
                     }
                 }
 
-                fn itemsize(&self) -> usize {
+                const fn itemsize(&self) -> usize {
                     match self {
                         $(ArrayContentType::$n(_) => std::mem::size_of::<$t>(),)*
                     }
@@ -554,11 +554,11 @@ mod array {
         (f64, f64_try_into_from_object, f64_swap_bytes, PyFloat::from),
     );
 
-    fn f32_swap_bytes(x: f32) -> f32 {
+    const fn f32_swap_bytes(x: f32) -> f32 {
         f32::from_bits(x.to_bits().swap_bytes())
     }
 
-    fn f64_swap_bytes(x: f64) -> f64 {
+    const fn f64_swap_bytes(x: f64) -> f64 {
         f64::from_bits(x.to_bits().swap_bytes())
     }
 
@@ -1557,7 +1557,7 @@ mod array {
                 _ => None,
             }
         }
-        fn item_size(self) -> usize {
+        const fn item_size(self) -> usize {
             match self {
                 Self::Int8 { .. } => 1,
                 Self::Int16 { .. } | Self::Utf16 { .. } => 2,

diff --git a/stdlib/src/binascii.rs b/stdlib/src/binascii.rs
@@ -160,7 +160,7 @@ mod decl {
         })
     }
 
-    fn unhex_nibble(c: u8) -> Option<u8> {
+    const fn unhex_nibble(c: u8) -> Option<u8> {
         match c {
             b'0'..=b'9' => Some(c - b'0'),
             b'a'..=b'f' => Some(c - b'a' + 10),
@@ -810,7 +810,7 @@ mod decl {
         vm: &VirtualMachine,
     ) -> PyResult<Vec<u8>> {
         #[inline]
-        fn uu_b2a(num: u8, backtick: bool) -> u8 {
+        const fn uu_b2a(num: u8, backtick: bool) -> u8 {
             if backtick && num == 0 {
                 0x60
             } else {

diff --git a/stdlib/src/compression.rs b/stdlib/src/compression.rs
@@ -66,7 +66,7 @@ impl DecompressFlushKind for () {
     const SYNC: Self = ();
 }
 
-pub fn flush_sync<T: DecompressFlushKind>(_final_chunk: bool) -> T {
+pub const fn flush_sync<T: DecompressFlushKind>(_final_chunk: bool) -> T {
     T::SYNC
 }
 
@@ -76,13 +76,13 @@ pub struct Chunker<'a> {
     data2: &'a [u8],
 }
 impl<'a> Chunker<'a> {
-    pub fn new(data: &'a [u8]) -> Self {
+    pub const fn new(data: &'a [u8]) -> Self {
         Self {
             data1: data,
             data2: &[],
         }
     }
-    pub fn chain(data1: &'a [u8], data2: &'a [u8]) -> Self {
+    pub const fn chain(data1: &'a [u8], data2: &'a [u8]) -> Self {
         if data1.is_empty() {
             Self {
                 data1: data2,
@@ -92,10 +92,10 @@ impl<'a> Chunker<'a> {
             Self { data1, data2 }
         }
     }
-    pub fn len(&self) -> usize {
+    pub const fn len(&self) -> usize {
         self.data1.len() + self.data2.len()
     }
-    pub fn is_empty(&self) -> bool {
+    pub const fn is_empty(&self) -> bool {
         self.data1.is_empty()
     }
     pub fn to_vec(&self) -> Vec<u8> {
@@ -216,7 +216,7 @@ pub struct CompressState<C: Compressor> {
 }
 
 impl<C: Compressor> CompressState<C> {
-    pub fn new(compressor: C) -> Self {
+    pub const fn new(compressor: C) -> Self {
         Self {
             compressor: Some(compressor),
         }
@@ -293,15 +293,15 @@ impl<D: Decompressor> DecompressState<D> {
         }
     }
 
-    pub fn eof(&self) -> bool {
+    pub const fn eof(&self) -> bool {
         self.eof
     }
 
     pub fn unused_data(&self) -> PyBytesRef {
         self.unused_data.clone()
     }
 
-    pub fn needs_input(&self) -> bool {
+    pub const fn needs_input(&self) -> bool {
         self.needs_input
     }
 

diff --git a/stdlib/src/csv.rs b/stdlib/src/csv.rs
@@ -84,11 +84,11 @@ mod _csv {
             Some(vm.ctx.new_str(format!("{}", self.quotechar? as char)))
         }
         #[pygetset]
-        fn doublequote(&self) -> bool {
+        const fn doublequote(&self) -> bool {
             self.doublequote
         }
         #[pygetset]
-        fn skipinitialspace(&self) -> bool {
+        const fn skipinitialspace(&self) -> bool {
             self.skipinitialspace
         }
         #[pygetset]
@@ -108,7 +108,7 @@ mod _csv {
             Some(vm.ctx.new_str(format!("{}", self.escapechar? as char)))
         }
         #[pygetset(name = "strict")]
-        fn get_strict(&self) -> bool {
+        const fn get_strict(&self) -> bool {
             self.strict
         }
     }
@@ -659,7 +659,7 @@ mod _csv {
     }
 
     impl FormatOptions {
-        fn update_py_dialect(&self, mut res: PyDialect) -> PyDialect {
+        const fn update_py_dialect(&self, mut res: PyDialect) -> PyDialect {
             macro_rules! check_and_fill {
                 ($res:ident, $e:ident) => {{
                     if let Some(t) = self.$e {
@@ -916,7 +916,7 @@ mod _csv {
             self.state.lock().line_num
         }
         #[pygetset]
-        fn dialect(&self, _vm: &VirtualMachine) -> PyDialect {
+        const fn dialect(&self, _vm: &VirtualMachine) -> PyDialect {
             self.dialect
         }
     }
@@ -1066,7 +1066,7 @@ mod _csv {
     #[pyclass]
     impl Writer {
         #[pygetset(name = "dialect")]
-        fn get_dialect(&self, _vm: &VirtualMachine) -> PyDialect {
+        const fn get_dialect(&self, _vm: &VirtualMachine) -> PyDialect {
             self.dialect
         }
         #[pymethod]

diff --git a/stdlib/src/faulthandler.rs b/stdlib/src/faulthandler.rs
@@ -39,7 +39,7 @@ mod decl {
     }
 
     #[pyfunction]
-    fn enable(_args: EnableArgs) {
+    const fn enable(_args: EnableArgs) {
         // TODO
     }
 
@@ -57,7 +57,7 @@ mod decl {
     }
 
     #[pyfunction]
-    fn register(_args: RegisterArgs) {
+    const fn register(_args: RegisterArgs) {
         // TODO
     }
 }