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5 changes: 4 additions & 1 deletion src/prism.c
Original file line number Diff line number Diff line change
Expand Up @@ -6169,7 +6169,10 @@ pm_numbered_reference_read_node_number(pm_parser_t *parser, const pm_token_t *to
const uint8_t *end = token->end;

ptrdiff_t diff = end - start;
assert(diff > 0 && ((unsigned long) diff < SIZE_MAX));
assert(diff > 0);
#if PTRDIFF_MAX > SIZE_MAX
assert(diff < (ptrdiff_t) SIZE_MAX);
#endif
size_t length = (size_t) diff;

char *digits = xcalloc(length + 1, sizeof(char));
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