clippy: ignore useless_let_if_seq

Author: little-dude

src/app/help.rs

@@ -511,6 +511,7 @@ impl<'a> Help<'a> {
     /// Writes help for all arguments (options, flags, args, subcommands)
     /// including titles of a Parser Object to the wrapped stream.
     #[cfg_attr(feature = "lints", allow(useless_let_if_seq))]
+    #[cfg_attr(feature = "cargo-clippy", allow(useless_let_if_seq))]
     pub fn write_all_args(&mut self, parser: &Parser) -> ClapResult<()> {
         debugln!("Help::write_all_args;");
         let flags = parser.has_flags();