Add tests

Author: spastorino

tests/ui/ergonomic-clones/async/local-type.rs

@@ -0,0 +1,9 @@
+// Check that using the parameter name in its type does not ICE.
+//@ edition:2018
+
+#![feature(ergonomic_clones)]
+
+fn main() {
+    let _ = async use |x: x| x; //~ ERROR expected type
+    let _ = async use |x: bool| -> x { x }; //~ ERROR expected type
+}

tests/ui/ergonomic-clones/async/local-type.stderr

@@ -0,0 +1,15 @@
+error[E0573]: expected type, found local variable `x`
+  --> $DIR/local-type.rs:7:27
+   |
+LL |     let _ = async use |x: x| x;
+   |                           ^ not a type
+
+error[E0573]: expected type, found local variable `x`
+  --> $DIR/local-type.rs:8:36
+   |
+LL |     let _ = async use |x: bool| -> x { x };
+   |                                    ^ not a type
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0573`.

tests/ui/ergonomic-clones/closure/basic.rs

@@ -39,4 +39,18 @@ fn ergonomic_clone_closure_use_cloned() -> Foo {
     f
 }
 
+fn ergonomic_clone_closure_copy() -> i32 {
+    let i = 1;
+
+    let i1 = use || {
+        i
+    };
+
+    let i2 = use || {
+        i
+    };
+
+    i
+}
+
 fn main() {}

tests/ui/ergonomic-clones/closure/expect-region.rs

@@ -0,0 +1,28 @@
+//@ known-bug: unknown
+// This test currently ICEs, need fix
+
+#![feature(ergonomic_clones)]
+#![allow(warnings)]
+
+fn closure_expecting_bound<F>(_: F)
+where
+    F: FnOnce(&u32),
+{
+}
+
+fn expect_bound_supply_named<'x>() {
+    let mut f: Option<&u32> = None;
+
+    // Here we give a type annotation that `x` should be free. We get
+    // an error because of that.
+    closure_expecting_bound(use |x: &'x u32| {
+        //~^ ERROR lifetime may not live long enough
+        //~| ERROR lifetime may not live long enough
+
+        // Borrowck doesn't get a chance to run, but if it did it should error
+        // here.
+        f = Some(x);
+    });
+}
+
+fn main() {}

tests/ui/ergonomic-clones/closure/fn-once.rs

@@ -0,0 +1,13 @@
+#![feature(ergonomic_clones)]
+
+fn get_closure() -> Box<dyn Fn() -> Vec<u8>> {
+    let vec = vec![1u8, 2u8];
+
+    let closure = use || { //~ ERROR expected a closure
+        vec
+    };
+
+    Box::new(closure)
+}
+
+fn main() {}

tests/ui/ergonomic-clones/closure/fn-once.stderr

@@ -0,0 +1,16 @@
+error[E0525]: expected a closure that implements the `Fn` trait, but this closure only implements `FnOnce`
+  --> $DIR/fn-once.rs:6:19
+   |
+LL |     let closure = use || {
+   |                   ^^^^^^ this closure implements `FnOnce`, not `Fn`
+LL |         vec
+   |         --- closure is `FnOnce` because it moves the variable `vec` out of its environment
+...
+LL |     Box::new(closure)
+   |     ----------------- the requirement to implement `Fn` derives from here
+   |
+   = note: required for the cast from `Box<{closure@$DIR/fn-once.rs:6:19: 6:25}>` to `Box<(dyn Fn() -> Vec<u8> + 'static)>`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0525`.

tests/ui/ergonomic-clones/closure/immutable-outer-variable.fixed

@@ -0,0 +1,15 @@
+//@ run-rustfix
+
+// Point at the captured immutable outer variable
+
+#![feature(ergonomic_clones)]
+
+fn foo(mut f: Box<dyn FnMut()>) {
+    f();
+}
+
+fn main() {
+    let mut y = true;
+    foo(Box::new(use || y = !y) as Box<_>);
+    //~^ ERROR cannot assign to `y`, as it is not declared as mutable
+}

tests/ui/ergonomic-clones/closure/immutable-outer-variable.rs

@@ -0,0 +1,15 @@
+//@ run-rustfix
+
+// Point at the captured immutable outer variable
+
+#![feature(ergonomic_clones)]
+
+fn foo(mut f: Box<dyn FnMut()>) {
+    f();
+}
+
+fn main() {
+    let y = true;
+    foo(Box::new(use || y = !y) as Box<_>);
+    //~^ ERROR cannot assign to `y`, as it is not declared as mutable
+}

tests/ui/ergonomic-clones/closure/immutable-outer-variable.stderr

@@ -0,0 +1,14 @@
+error[E0594]: cannot assign to `y`, as it is not declared as mutable
+  --> $DIR/immutable-outer-variable.rs:13:25
+   |
+LL |     foo(Box::new(use || y = !y) as Box<_>);
+   |                         ^^^^^^ cannot assign
+   |
+help: consider changing this to be mutable
+   |
+LL |     let mut y = true;
+   |         +++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0594`.

tests/ui/ergonomic-clones/closure/local-type.rs

@@ -0,0 +1,8 @@
+// Check that using the parameter name in its type does not ICE.
+
+#![feature(ergonomic_clones)]
+
+fn main() {
+    let _ = use |x: x| x; //~ ERROR expected type
+    let _ = use |x: bool| -> x { x }; //~ ERROR expected type
+}