They did in the article $ cargo rustc --release -- -C prefer-dynamic $ ls -al target/release/hello -rwxrwxr-x 1 lifthrasiir 8831 May 31 21:10 targ

They did in the article $ cargo rustc --release -- -C prefer-dynamic $ ls -al target/release/hello -rwxrwxr-x 1 lifthrasiir 8831 May 31 21:10 target/release/hello*