Cargo Features

[dependencies]
chain-builder = { version = "0.1.25", default-features = false, features = ["full", "sqlx_mysql", "mysql", "postgres", "dev-dependencies"] }
default = mysql, sqlx_mysql

These default features are set whenever chain-builder is added without default-features = false somewhere in the dependency tree.

full dev-dependencies? = mysql, sqlx_mysql
sqlx_mysql default full?

Enables mysql of sqlx

mysql default full?
postgres
dev-dependencies = full

ChainBuilder has 6 features without comments.