Cargo Features

[dependencies]
plonk-pallet = { version = "0.2.2", default-features = false, features = ["std"] }
default = std

The std feature is set by default whenever plonk-pallet is added without default-features = false somewhere in the dependency tree.

std default

Enables std of frame-support ^3.0.0, frame-system ^3.0.0, parity-scale-codec ^2.0, and sp-std ^3.0.0

frame-system:

substrate pallet