Cargo is insufficiently verbose about debug builds being slow

[Lokathor]

Many people coming from hosted languages are not familiar with the concept of having to pass a flag to speed up the program.

would it be possible to have the phrase "unoptimized + debug info" in a default profile dev build print the world "unoptimized" in all caps so that it's a little more eye catching?

[epage]

FYI there has been a lot of design discussion at https://rust-lang.zulipchat.com/#narrow/stream/246057-t-cargo/topic/cargo.20build.20default.20profile