Cargo Features

[dependencies]
al-sys = { version = "0.6.1", default-features = false, features = ["dynamic"] }
default = dynamic

The dynamic feature is set by default whenever al-sys is added without default-features = false somewhere in the dependency tree.

dynamic default = libloading, rental

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.

libloading not emscripten dynamic

Enables libloading ^0.5

rental not emscripten dynamic