constify a bunch of methods

vm/src/function/argument.rs

@@ -302,12 +302,14 @@ pub trait FromArgOptional {
     type Inner: TryFromObject;
     fn from_inner(x: Self::Inner) -> Self;
 }
+
 impl<T: TryFromObject> FromArgOptional for OptionalArg<T> {
     type Inner = T;
     fn from_inner(x: T) -> Self {
         Self::Present(x)
     }
 }
+
 impl<T: TryFromObject> FromArgOptional for T {
     type Inner = Self;
     fn from_inner(x: Self) -> Self {
@@ -342,7 +344,7 @@ where
 }
 
 impl<T> KwArgs<T> {
-    pub fn new(map: IndexMap<String, T>) -> Self {
+    pub const fn new(map: IndexMap<String, T>) -> Self {
         KwArgs(map)
     }
 
@@ -354,11 +356,13 @@ impl<T> KwArgs<T> {
         self.0.is_empty()
     }
 }
+
 impl<T> FromIterator<(String, T)> for KwArgs<T> {
     fn from_iter<I: IntoIterator<Item = (String, T)>>(iter: I) -> Self {
         KwArgs(iter.into_iter().collect())
     }
 }
+
 impl<T> Default for KwArgs<T> {
     fn default() -> Self {
         KwArgs(IndexMap::new())
@@ -408,7 +412,7 @@ where
 }
 
 impl<T> PosArgs<T> {
-    pub fn new(args: Vec<T>) -> Self {
+    pub const fn new(args: Vec<T>) -> Self {
         Self(args)
     }
 

vm/src/function/buffer.rs

@@ -51,11 +51,11 @@ impl ArgBytesLike {
         f(&self.borrow_buf())
     }
 
-    pub fn len(&self) -> usize {
+    pub const fn len(&self) -> usize {
         self.0.desc.len
     }
 
-    pub fn is_empty(&self) -> bool {
+    pub const fn is_empty(&self) -> bool {
         self.len() == 0
     }
 
@@ -103,11 +103,11 @@ impl ArgMemoryBuffer {
         f(&mut self.borrow_buf_mut())
     }
 
-    pub fn len(&self) -> usize {
+    pub const fn len(&self) -> usize {
         self.0.desc.len
     }
 
-    pub fn is_empty(&self) -> bool {
+    pub const fn is_empty(&self) -> bool {
         self.len() == 0
     }
 }

vm/src/object/core.rs

@@ -491,6 +491,7 @@ pub struct PyObject(PyInner<Erased>);
 
 impl Deref for PyObjectRef {
     type Target = PyObject;
+
     #[inline(always)]
     fn deref(&self) -> &PyObject {
         unsafe { self.ptr.as_ref() }

vm/src/object/ext.rs

@@ -47,6 +47,7 @@ where
         fmt::Display::fmt(&**self, f)
     }
 }
+
 impl<T: fmt::Display> fmt::Display for Py<T>
 where
     T: PyObjectPayload + fmt::Display,
@@ -72,6 +73,7 @@ impl<T: PyPayload> PyExact<T> {
 
 impl<T: PyPayload> Deref for PyExact<T> {
     type Target = Py<T>;
+
     #[inline(always)]
     fn deref(&self) -> &Py<T> {
         &self.inner
@@ -108,6 +110,7 @@ impl<T: PyObjectPayload> AsRef<Py<T>> for PyExact<T> {
 
 impl<T: PyPayload> std::borrow::ToOwned for PyExact<T> {
     type Owned = PyRefExact<T>;
+
     fn to_owned(&self) -> Self::Owned {
         let owned = self.inner.to_owned();
         unsafe { PyRefExact::new_unchecked(owned) }
@@ -181,6 +184,7 @@ impl<T: PyPayload> TryFromObject for PyRefExact<T> {
 
 impl<T: PyPayload> Deref for PyRefExact<T> {
     type Target = PyExact<T>;
+
     #[inline(always)]
     fn deref(&self) -> &PyExact<T> {
         unsafe { PyExact::ref_unchecked(self.inner.deref()) }

vm/src/object/traverse.rs

@@ -158,6 +158,7 @@ unsafe impl<A: Traverse> Traverse for (A,) {
         self.0.traverse(tracer_fn);
     }
 }
+
 trace_tuple!((A, 0), (B, 1));
 trace_tuple!((A, 0), (B, 1), (C, 2));
 trace_tuple!((A, 0), (B, 1), (C, 2), (D, 3));

vm/src/protocol/number.rs

@@ -18,7 +18,7 @@ pub type PyNumberTernaryFunc = fn(&PyObject, &PyObject, &PyObject, &VirtualMachi
 
 impl PyObject {
     #[inline]
-    pub fn to_number(&self) -> PyNumber<'_> {
+    pub const fn to_number(&self) -> PyNumber<'_> {
         PyNumber(self)
     }
 
@@ -440,7 +440,7 @@ impl Deref for PyNumber<'_> {
 }
 
 impl<'a> PyNumber<'a> {
-    pub(crate) fn obj(self) -> &'a PyObject {
+    pub(crate) const fn obj(self) -> &'a PyObject {
         self.0
     }
 

vm/src/types/slot.rs

@@ -1116,7 +1116,7 @@ impl PyComparisonOp {
         }
     }
 
-    pub fn operator_token(self) -> &'static str {
+    pub const fn operator_token(self) -> &'static str {
         match self {
             Self::Lt => "<",
             Self::Le => "<=",