delete some no-longer-meaningful tests

tests/ui/derives/auxiliary/rustc-serialize.rs

@@ -1,16 +0,0 @@
-#![crate_type = "lib"]
-
-pub trait Decoder {
-    type Error;
-
-    fn read_enum<T, F>(&mut self, name: &str, f: F) -> Result<T, Self::Error>
-        where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
-    fn read_enum_variant<T, F>(&mut self, names: &[&str], f: F)
-                               -> Result<T, Self::Error>
-        where F: FnMut(&mut Self, usize) -> Result<T, Self::Error>;
-
-}
-
-pub trait Decodable: Sized {
-    fn decode<D: Decoder>(d: &mut D) -> Result<Self, D::Error>;
-}

tests/ui/deriving/deriving-enum-single-variant.rs

@@ -1,11 +0,0 @@
-//@ run-pass
-#![allow(non_camel_case_types)]
-
-pub type task_id = isize;
-
-#[derive(PartialEq)]
-pub enum Task {
-    TaskHandle(task_id)
-}
-
-pub fn main() { }

tests/ui/deriving/deriving-in-macro.rs

@@ -1,16 +0,0 @@
-//@ check-pass
-#![allow(non_camel_case_types)]
-#![allow(dead_code)]
-
-macro_rules! define_vec {
-    () => (
-        mod foo {
-            #[derive(PartialEq)]
-            pub struct bar;
-        }
-    )
-}
-
-define_vec![];
-
-pub fn main() {}

tests/ui/deriving/deriving-meta-multiple.rs

@@ -1,25 +0,0 @@
-//@ run-pass
-#![allow(unused_must_use)]
-#![allow(unused_imports)]
-#![allow(deprecated)]
-
-use std::hash::{Hash, SipHasher};
-
-// testing multiple separate deriving attributes
-#[derive(PartialEq)]
-#[derive(Clone)]
-#[derive(Hash)]
-struct Foo {
-    bar: usize,
-    baz: isize
-}
-
-fn hash<T: Hash>(_t: &T) {}
-
-pub fn main() {
-    let a = Foo {bar: 4, baz: -3};
-
-    a == a;    // check for PartialEq impl w/o testing its correctness
-    a.clone(); // check for Clone impl w/o testing its correctness
-    hash(&a);  // check for Hash impl w/o testing its correctness
-}

tests/ui/deriving/deriving-meta.rs

@@ -1,22 +0,0 @@
-//@ run-pass
-#![allow(unused_must_use)]
-#![allow(unused_imports)]
-#![allow(deprecated)]
-
-use std::hash::{Hash, SipHasher};
-
-#[derive(PartialEq, Clone, Hash)]
-struct Foo {
-    bar: usize,
-    baz: isize
-}
-
-fn hash<T: Hash>(_t: &T) {}
-
-pub fn main() {
-    let a = Foo {bar: 4, baz: -3};
-
-    a == a;    // check for PartialEq impl w/o testing its correctness
-    a.clone(); // check for Clone impl w/o testing its correctness
-    hash(&a);  // check for Hash impl w/o testing its correctness
-}