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Replace extremely opaque (unhelpful) error message with a truthful reflection of what we know.

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This commit is contained in:
Ralf W. Grosse-Kunstleve 2022-05-10 18:22:50 -07:00
parent de84a27fd4
commit 498195ac4b
2 changed files with 8 additions and 3 deletions
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6
include/pybind11/detail/type_caster_base.h
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@ -473,8 +473,10 @@ PYBIND11_NOINLINE bool isinstance_generic(handle obj, const std::type_info &tp)
PYBIND11_NOINLINE std::string
error_string(PyObject *exc_type, PyObject *exc_value, PyObject *exc_trace) {
if (!exc_type) {
PyErr_SetString(PyExc_RuntimeError, "Unknown internal error occurred");
return "Unknown internal error occurred";
static const char *msg
= "Internal error: error_string() called without a Python error available.";
PyErr_SetString(PyExc_RuntimeError, msg);
return msg;
}
auto result = handle(exc_type).attr("__name__").cast<std::string>();

5
tests/test_exceptions.cpp
View File

@ -228,7 +228,10 @@ TEST_SUBMODULE(exceptions, m) {
throw py::error_already_set();
} catch (const std::runtime_error &e) {
if ((err && e.what() != std::string("ValueError: foo"))
|| (!err && e.what() != std::string("Unknown internal error occurred"))) {
|| (!err
&& e.what()
!= std::string("Internal error: error_string() called without a Python "
"error available."))) {
PyErr_Clear();
throw std::runtime_error("error message mismatch");
}