Cargo Features

[dependencies]
clevel = { version = "0.1.7", default-features = false, features = ["wee_alloc", "console_error_panic_hook"] }
default = console_error_panic_hook

The console_error_panic_hook feature is set by default whenever clevel 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.

wee_alloc implicit feature

Enables wee_alloc

wee_alloc:

wee_alloc: The Wasm-Enabled, Elfin Allocator

console_error_panic_hook default