$ RUST_LOG=externref=info \
  externref --drop-fn test::drop -o /dev/null tests/test.wasm
 INFO process: externref::processor: parsed custom section functions.len=5
 INFO process:replace_functions: externref::processor::state: replaced calls to 
externref imports replaced_count=13 INFO process:process_functions:transform_import{module="test" name="send_messag
e"}: externref::processor::state: replaced function signature params=[I32, I32,
I32] results=[I32] new_params=[Ref(Externref), I32, I32] new_results=[Ref(Extern
ref)] INFO process:process_functions:transform_import{module="test" name="message_len
"}: externref::processor::state: replaced function signature params=[I32] result
s
=[I32] new_params=[Ref(Externref)] new_results=[I32] INFO process:process_functions:transform_export{name="test_export"}: externref:
:processor::state
: replaced function signature params=[I32] results=[] new_param
s
=[Ref(Externref)] new_results=[] INFO process:process_functions:transform_export{name="test_export_with_casts"}:
externref::processor::state: replaced function signature params=[I32] results=[
] new_params=[Ref(Externref)] new_results=[] INFO process:process_functions:transform_export{name="test_nulls"}: externref::
processor::state
: replaced function signature params=[I32] results=[] new_params
=
[Ref(Externref)] new_results=[]
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