promise typ rooted

Author: oscardssmith

src/builtins.c

@@ -1773,6 +1773,7 @@ JL_CALLABLE(jl_f_memoryrefnew)
         if(jl_is_genericmemory(args[0])) {
             jl_genericmemory_t *m = (jl_genericmemory_t*)args[0];
             jl_value_t *typ = jl_apply_type((jl_value_t*)jl_genericmemoryref_type, jl_svec_data(((jl_datatype_t*)jl_typetagof(m))->parameters), 3);
+            JL_GC_PROMISE_ROOTED(typ); // it is a concrete type
             if (i >= m->length)
                 jl_bounds_error((jl_value_t*)m, args[1]);
             const jl_datatype_layout_t *layout = ((jl_datatype_t*)jl_typetagof(m))->layout;