Module dprint 

Calls eprintln! but only if enabled

Enabling means both --cfg derive_deftly_dprint and DERIVE_DEFTLY_DPRINT set to 1.

RUSTFLAGS="--cfg derive_deftly_dprint" DERIVE_DEFTLY_DPRINT=1 cargo build

Output can be rather interleaved due to test parallelism etc.

Macros

dprint_block 🔒

For debug printing a block of input or output

dprintln 🔒