diff -r 09eb477eec65 -r ab6198160960 rust/hg-pyo3/src/exceptions.rs
--- a/rust/hg-pyo3/src/exceptions.rs	Thu Feb 06 13:57:51 2025 +0100
+++ b/rust/hg-pyo3/src/exceptions.rs	Wed Feb 05 11:04:19 2025 +0100
@@ -2,6 +2,8 @@
 use pyo3::import_exception;
 use pyo3::{create_exception, PyErr};
 
+use std::fmt::Display;
+
 use hg::dirstate::{on_disk::DirstateV2ParseError, DirstateError};
 
 use hg::revlog::nodemap::NodeMapError;
@@ -50,6 +52,11 @@
     PyRuntimeError::new_err(format!("In Rust PyO3 bindings: {e}"))
 }
 
+#[allow(unused)]
+pub fn to_string_value_error<T: Display>(e: T) -> PyErr {
+    PyValueError::new_err(e.to_string())
+}
+
 pub mod mercurial_py_errors {
     pyo3::import_exception!(mercurial.error, RevlogError);
 }