error: malformed `unix_sigpipe` attribute input
  --> $DIR/unix_sigpipe-ident-list.rs:3:1
   |
LL | #[unix_sigpipe(sig_dfl)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unix_sigpipe = "inherit|sig_ign|sig_dfl"]`

error: aborting due to 1 previous error