(module int_to_str_smoke
  (fn main
    (doc "Iter hs.4: smoke pin for the int_to_str heap-Str builtin. `do io/print_str(int_to_str(42))` builds through the whole pipeline (checker resolves int_to_str:(Int)->Str, codegen lowers to call ptr @ailang_int_to_str(i64 42), runtime/str.c's ailang_int_to_str snprintfs into a heap-Str slab, io/print_str's @puts prints from the bytes pointer at offset 8). Single-value smoke; the spec's broader edge-case sweep (0, -1, i64::MAX, i64::MIN) is deferred to a follow-up tidy iter per the hs.4 plan.")
    (type (fn-type (params) (ret (own (con Unit))) (effects IO)))
    (params)
    (body (seq (do io/print_str (app int_to_str 42)) (do io/print_str "\n")))))