Cargo Features

[dependencies]
agb = { version = "0.21.1", default-features = false, features = ["backtrace", "multiboot", "testing"] }
default = backtrace, testing

These default features are set whenever agb is added without default-features = false somewhere in the dependency tree.

backtrace default = testing

Enables qrcodegen-no-heap

multiboot
testing default backtrace

AGB has 4 features without comments.