bpo-31338 (#3374)

* Add Py_UNREACHABLE() as an alias to abort().
* Use Py_UNREACHABLE() instead of assert(0)
* Convert more unreachable code to use Py_UNREACHABLE()
* Document Py_UNREACHABLE() and a few other macros.

1 files changed, 1 insertions, 2 deletions

diff --git a/Parser/grammar1.c b/Parser/grammar1.c
index 30a6f07..9e99041 100644
--- a/Parser/grammar1.c
+++ b/Parser/grammar1.c
@@ -25,8 +25,7 @@ PyGrammar_FindDFA(grammar *g, int type)
         if (d->d_type == type)
             return d;
     }
-    assert(0);
-    /* NOTREACHED */
+    Py_UNREACHABLE();
 #endif
 }