Cargo Features

[dependencies]
frame-metadata-hash-extension = { version = "0.6.0", default-features = false, features = ["std"] }
default = std

The std feature is set by default whenever frame-metadata-hash-extension is added without default-features = false somewhere in the dependency tree.

std default

Enables std of parity-scale-codec, frame-support, frame-system, log, scale-info, and sp-runtime

frame-metadata-hash-extension has 2 features without comments.