Lib.rs

Cargo Features

[dependencies]
debug-span = { version = "0.2.0", default-features = false, features = ["proc-macro2"] }

default = proc-macro2

The proc-macro2 feature is set by default whenever debug-span is added without default-features = false somewhere in the dependency tree.

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.

proc-macro2 default