<https://rust-lang.github.io/rustup/overrides.html> for more
information about how toolchain overrides work.
+ --config KEY=VALUE or PATH
+ Overrides a Cargo configuration value. The argument should be in
+ TOML syntax of KEY=VALUE, or provided as a path to an extra
+ configuration file. This flag may be specified multiple times. See
+ the command-line overrides section
+ <https://doc.rust-lang.org/cargo/reference/config.html#command-line-overrides>
+ for more information.
+
-h, --help
Prints help information.