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-rw-r--r--py/modstruct.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/py/modstruct.c b/py/modstruct.c
index cd32097388..eabc951aef 100644
--- a/py/modstruct.c
+++ b/py/modstruct.c
@@ -120,8 +120,9 @@ STATIC mp_obj_t struct_calcsize(mp_obj_t fmt_in) {
if (sz == 0) {
sz = (mp_uint_t)mp_binary_get_size(fmt_type, *fmt, &align);
}
- // TODO
- assert(sz != (mp_uint_t)-1);
+ if (sz == 0) {
+ nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "unsupported format"));
+ }
// Apply alignment
size = (size + align - 1) & ~(align - 1);
size += sz;