pub(crate) const RUST_LOG_STYLE: &str = "RUST_LOG_STYLE";Expand description
Our custom rustc driver will not be run in an proper terminal,
thus logs would appear uncolored. When no RUST_LOG_STYLE env. var.
is set, rust_log_style checks wether the cargo hax command was
run inside a terminal. If it was inside a terminal,
rust_log_style returns "always", which is the usual default
behavior. Otherwise we return "never". When RUST_LOG_STYLE is
set, we just return its value.