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] //~ ERROR malformed `derive` attribute input
struct Test4;

fn main() {}