Powdr plonky3 logging

See logging

in backend/plonly3/stark.rs

there is a challenge test, to run it with trace logging, use the below command:

RUST_LOG=trace cargo test --features plonky3 --package powdr-backend --lib -- plonky3::stark::tests::challenge --exact --show-output

more info comes out like:

to see a logging from a specific module add the module name in the RUST_LOG parameter like:

RUST_LOG=powdr_plonky3=trace cargo test --features plonky3 --package powdr-backend --lib -- plonky3::stark::tests::challenge --exact --show-output

you can see this

How?

add dependency:

log = "0.4"

use package

use log::{trace, info};

code to print:

info!("Challenges by stage: {:?}", challenges_by_stage);

Notes:

add dependency of tracing also fine, the trace subscriber is enable somewhere when running prove or test by itself

tracing = "0.1.37"