Add UI test outputs

src/test/ui/generator/borrowing.stderr

@@ -0,0 +1,29 @@
+error[E0597]: `a` does not live long enough
+  --> $DIR/borrowing.rs:18:20
+   |
+18 |         (|| yield &a).resume()
+   |          --        ^ does not live long enough
+   |          |
+   |          capture occurs here
+19 |         //~^ ERROR: `a` does not live long enough
+20 |     };
+   |     - borrowed value only lives until here
+...
+29 | }
+   | - borrowed value needs to live until here
+
+error[E0597]: `a` does not live long enough
+  --> $DIR/borrowing.rs:25:20
+   |
+24 |         || {
+   |         -- capture occurs here
+25 |             yield &a
+   |                    ^ does not live long enough
+...
+28 |     };
+   |     - borrowed value only lives until here
+29 | }
+   | - borrowed value needs to live until here
+
+error: aborting due to 2 previous errors
+

src/test/ui/generator/no-arguments-on-generators.stderr

@@ -0,0 +1,8 @@
+error[E0625]: generators cannot have explicit arguments
+  --> $DIR/no-arguments-on-generators.rs:14:15
+   |
+14 |     let gen = |start| { //~ ERROR generators cannot have explicit arguments
+   |               ^^^^^^^
+
+error: aborting due to previous error
+

src/test/ui/generator/not-send-sync.stderr

@@ -0,0 +1,24 @@
+error[E0277]: the trait bound `std::cell::Cell<i32>: std::marker::Sync` is not satisfied
+  --> $DIR/not-send-sync.rs:26:5
+   |
+26 |     assert_send(|| {
+   |     ^^^^^^^^^^^ `std::cell::Cell<i32>` cannot be shared between threads safely
+   |
+   = help: the trait `std::marker::Sync` is not implemented for `std::cell::Cell<i32>`
+   = note: required because of the requirements on the impl of `std::marker::Send` for `&std::cell::Cell<i32>`
+   = note: required because it appears within the type `[generator@$DIR/not-send-sync.rs:26:17: 30:6 a:&std::cell::Cell<i32> _]`
+   = note: required by `main::assert_send`
+
+error[E0277]: the trait bound `std::cell::Cell<i32>: std::marker::Sync` is not satisfied in `[generator@$DIR/not-send-sync.rs:19:17: 23:6 (std::cell::Cell<i32>, ())]`
+  --> $DIR/not-send-sync.rs:19:5
+   |
+19 |     assert_sync(|| {
+   |     ^^^^^^^^^^^ `std::cell::Cell<i32>` cannot be shared between threads safely
+   |
+   = help: within `[generator@$DIR/not-send-sync.rs:19:17: 23:6 (std::cell::Cell<i32>, ())]`, the trait `std::marker::Sync` is not implemented for `std::cell::Cell<i32>`
+   = note: required because it appears within the type `(std::cell::Cell<i32>, ())`
+   = note: required because it appears within the type `[generator@$DIR/not-send-sync.rs:19:17: 23:6 (std::cell::Cell<i32>, ())]`
+   = note: required by `main::assert_sync`
+
+error: aborting due to 2 previous errors
+

src/test/ui/generator/yield-in-const.stderr

@@ -0,0 +1,10 @@
+error[E0601]: main function not found
+
+error[E0627]: yield statement outside of generator literal
+  --> $DIR/yield-in-const.rs:13:17
+   |
+13 | const A: u8 = { yield 3u8; 3u8};
+   |                 ^^^^^^^^^
+
+error: aborting due to 2 previous errors
+

src/test/ui/generator/yield-in-function.stderr

@@ -0,0 +1,8 @@
+error[E0627]: yield statement outside of generator literal
+  --> $DIR/yield-in-function.rs:13:13
+   |
+13 | fn main() { yield; }
+   |             ^^^^^
+
+error: aborting due to previous error
+

src/test/ui/generator/yield-in-static.stderr

@@ -0,0 +1,10 @@
+error[E0601]: main function not found
+
+error[E0627]: yield statement outside of generator literal
+  --> $DIR/yield-in-static.rs:13:18
+   |
+13 | static B: u8 = { yield 3u8; 3u8};
+   |                  ^^^^^^^^^
+
+error: aborting due to 2 previous errors
+