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[BUG]: "Already defined" import error when reusing a value name in different enums #6031
What version (or hash if on master) of pybind11 are you using?
v3.0.3
Problem description
native_enum value names seem to have global collision scope. When adding a value with a name which was already used in another enum, it compiles successfully, but an ImportError is raised when importing.
Reproducible example code
#include<pybind11/pybind11.h>
#include<pybind11/native_enum.h>namespacepy= pybind11;
enumclassSomeEnum { value, another_value };
enumclassAnotherEnum { first_value, second_value, another_value };
PYBIND11_MODULE(enum_collision_test, mod) {
py::native_enum<SomeEnum>(mod, "SomeEnum", "enum.Enum")
.value("VALUE", SomeEnum::value)
// First definition which uses "ANOTHER_VALUE"
.value("ANOTHER_VALUE", SomeEnum::another_value)
.export_values()
.finalize();
py::native_enum<AnotherEnum>(mod, "AnotherEnum", "enum.Enum")
.value("FIRST_VALUE", AnotherEnum::first_value)
.value("SECOND_VALUE", AnotherEnum::second_value)
// Causes ImportError: pybind11::native_enum<...>("AnotherEnum").value("ANOTHER_VALUE"): an object with that name is already defined
.value("ANOTHER_VALUE", AnotherEnum::another_value)
.export_values()
.finalize();
}
Is this a regression? Put the last known working version here if it is.
changed the title [-][BUG]: Same value name in different enums - already defined error[/-][+][BUG]: "Already defined" import error when reusing a value name in different enums[/+]on Apr 7, 2026
Activity
[-][BUG]: Same value name in different enums - already defined error[/-][+][BUG]: "Already defined" import error when reusing a value name in different enums[/+]fix: allow native_enum to shadow an Enum member with the same name in…