src/test/ui/malformed/malformed-derive-entry.rs

#[derive(Copy(Bad))]
//~^ ERROR expected one of `)`, `,`, or `::`, found `(`
struct Test1;

#[derive(Copy="bad")]
//~^ ERROR expected one of `)`, `,`, or `::`, found `=`
struct Test2;

#[derive()]
//~^ WARNING empty trait list
struct Test3;

#[derive]
//~^ WARNING empty trait list
struct Test4;

fn main() {}