Cargo Features

libredr-common has no features set by default.

[dependencies]
libredr-common = { version = "0.0.19", features = ["jemalloc"] }
jemalloc = tikv-jemallocator

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.

tikv-jemallocator not msvc jemalloc?