src/doc/book/listings/ch13-functional-features/listing-13-01/output.txt


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$ cargo run
   Compiling shirt-company v0.1.0 (file:///projects/shirt-company)
    Finished dev [unoptimized + debuginfo] target(s) in 0.27s
     Running `target/debug/shirt-company`
The user with preference Some(Red) gets Red
The user with preference None gets Blue