remove several redundant tests

tests/ui/binding/match-naked-record.rs

@@ -1,12 +0,0 @@
-//@ run-pass
-#![allow(dead_code)]
-
-struct X { x: isize }
-
-pub fn main() {
-    let _x = match 0 {
-      _ => X {
-        x: 0
-      }
-    };
-}

tests/ui/issues/issue-4830.rs

@@ -1,10 +0,0 @@
-//@ check-pass
-#![allow(dead_code)]
-
-
-pub struct Scheduler {
-    /// The event loop used to drive the scheduler and perform I/O
-    event_loop: Box<isize>
-}
-
-pub fn main() { }

tests/ui/issues/issue-5192.rs

@@ -1,38 +0,0 @@
-//@ run-pass
-#![allow(dead_code)]
-
-pub trait EventLoop {
-    fn dummy(&self) { }
-}
-
-pub struct UvEventLoop {
-    uvio: isize
-}
-
-impl UvEventLoop {
-    pub fn new() -> UvEventLoop {
-        UvEventLoop {
-            uvio: 0
-        }
-    }
-}
-
-impl EventLoop for UvEventLoop {
-}
-
-pub struct Scheduler {
-    event_loop: Box<dyn EventLoop+'static>,
-}
-
-impl Scheduler {
-
-    pub fn new(event_loop: Box<dyn EventLoop+'static>) -> Scheduler {
-        Scheduler {
-            event_loop: event_loop,
-        }
-    }
-}
-
-pub fn main() {
-    let _sched = Scheduler::new(Box::new(UvEventLoop::new()) as Box<dyn EventLoop>);
-}

tests/ui/macros/unreachable.rs

@@ -1,7 +0,0 @@
-//@ run-fail
-//@ error-pattern:internal error: entered unreachable code
-//@ needs-subprocess
-
-fn main() {
-    unreachable!()
-}

tests/ui/moves/array-copy-move.rs

@@ -1,8 +0,0 @@
-//! regression test for issue https://github.com/rust-lang/rust/issues/16783
-//@ run-pass
-#![allow(unused_variables)]
-
-pub fn main() {
-    let x = [1, 2, 3];
-    let y = x;
-}