Argtype descriptions name a literal parameter's cost, a phase's error is the phase's report, the ^-code table's grave-accent and dieresis rows (from dev ee86ca467512)

mac/eval_python.cpp

@@ -6,6 +6,12 @@
 std::regex Eval_python::statement_delimiter("\\s*;\\s*");
 PyObject* Eval_python::s_last_exception = nullptr;
 
+// See eval.h.  Set by fetch_python_exception(), beside the object it keeps.
+static std::string s_last_exception_type {};
+static std::string s_last_exception_text {};
+std::string last_python_exception_type() { return s_last_exception_type; }
+std::string last_python_exception_text() { return s_last_exception_text; }
+
 static bool s_python_output_to_log = false;
 
 void set_python_output_to_log(bool on)
@@ -226,6 +232,9 @@ std::string Eval_python::fetch_python_exception()
         detail = PyUnicode_AsUTF8(str);
         Py_DECREF(str);
     }
+    s_last_exception_text = detail;
+    s_last_exception_type =
+        ptype ? reinterpret_cast<PyTypeObject*>(ptype)->tp_name : "";
     PyObject* tb_module = PyImport_ImportModule("traceback");
     if (tb_module) {
         PyObject* format = PyObject_GetAttrString(tb_module, "format_exception");