Traceback on unraisable exceptions.

Cython/Compiler/Code.py

@@ -79,17 +79,17 @@ class UtilityCodeBase(object):
     Code sections in the file can be specified as follows:
 
         ##### MyUtility.proto #####
-        
+
         [proto declarations]
-        
+
         ##### MyUtility.init #####
-        
+
         [code run at module initialization]
 
         ##### MyUtility #####
         #@requires: MyOtherUtility
         #@substitute: naming
-        
+
         [definitions]
 
     for prototypes and implementation respectively.  For non-python or
@@ -2077,9 +2077,10 @@ class CCodeWriter(object):
             Naming.clineno_cname,
             Naming.lineno_cname,
             Naming.filename_cname,
+            int(self.globalstate.directives['unraisable_tracebacks'])
         )
         self.funcstate.uses_error_indicator = True
-        self.putln('__Pyx_WriteUnraisable("%s", %s, %s, %s);' % format_tuple)
+        self.putln('__Pyx_WriteUnraisable("%s", %s, %s, %s, %s);' % format_tuple)
         self.globalstate.use_utility_code(
             UtilityCode.load_cached("WriteUnraisableException", "Exceptions.c"))
 

Cython/Compiler/Options.py

@@ -112,6 +112,7 @@ directive_defaults = {
     'c_string_type': 'bytes',
     'c_string_encoding': '',
     'type_version_tag': True,   # enables Py_TPFLAGS_HAVE_VERSION_TAG on extension types
+    'unraisable_tracebacks': False,
 
     # set __file__ and/or __path__ to known source/target path at import time (instead of not having them available)
     'set_initial_path' : None,  # SOURCEFILE or "/full/path/to/module"

Cython/Utility/Exceptions.c

@@ -417,16 +417,22 @@ static CYTHON_INLINE void __Pyx_ExceptionSwap(PyObject **type, PyObject **value,
 /////////////// WriteUnraisableException.proto ///////////////
 
 static void __Pyx_WriteUnraisable(const char *name, int clineno,
-                                  int lineno, const char *filename); /*proto*/
+                                  int lineno, const char *filename,
+                                  int full_traceback); /*proto*/
 
 /////////////// WriteUnraisableException ///////////////
 //@requires: PyErrFetchRestore
 
 static void __Pyx_WriteUnraisable(const char *name, CYTHON_UNUSED int clineno,
-                                  CYTHON_UNUSED int lineno, CYTHON_UNUSED const char *filename) {
+                                  CYTHON_UNUSED int lineno, CYTHON_UNUSED const char *filename,
+                                  int full_traceback) {
     PyObject *old_exc, *old_val, *old_tb;
     PyObject *ctx;
     __Pyx_ErrFetch(&old_exc, &old_val, &old_tb);
+    if (full_traceback) {
+        __Pyx_ErrRestore(old_exc, old_val, old_tb);
+        PyErr_PrintEx(1);
+    }
     #if PY_MAJOR_VERSION < 3
     ctx = PyString_FromString(name);
     #else