Revert "Add assert"

This reverts commit 22e6132.

src/libponyc/type/matchtype.c

@@ -596,15 +596,7 @@ static matchtype_t is_nominal_match_entity(ast_t* operand, ast_t* pattern,
           ast_error_frame(errorf, o_cap,
             "this would be possible if the subcap were more ephemeral. "
             "Perhaps you meant to consume this variable");
-    }
-    else
-    {
-      // While working on fixing issue 4579, Joe and I became convinced that
-      // any code that ends up going down this path is buggy and we should
-      // assert. It is possible that we are wrong, but nothing in the ponyc
-      // test suite ends up here at the time we added the assert.
-      pony_assert(0);
-    }
+  }
 
     return MATCHTYPE_DENY_CAP;
   }