Cargo Features

rust_lisp has no features set by default.

[dependencies]
rust_lisp = { version = "0.18.0", features = ["bigint", "i8", "f64", "libm"] }
bigint = num-bigint, num-traits

What integer to use for Value::Int

i128 i64 i16 i8
f64

Use f64 for Value::Float, if unset, use f32

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 implicit feature

Enables libm

libm:

libm in pure Rust

num-traits bigint?
num-bigint bigint?