Lib.rs

Cargo Features

[dependencies]
optempty = { version = "0.1.13", default-features = false, features = ["std", "serdejson", "querymap"] }

default = std

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

std default querymap?

serdejson = serde_json

querymap = query_map, std

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

serde_json serdejson?

query_map querymap?