#[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]
struct Test4;