Cargo Features

[dependencies]
vsop87 = { version = "3.0.0", default-features = false, features = ["no_std", "simd"] }
default = simd

The simd feature is set by default whenever vsop87 is added without default-features = false somewhere in the dependency tree.

no_std = libm
simd default

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.

libm no_std?