Add more ranges parsing tests

--- stderr -------------------------------
error: expected expression, found `..`
  --> tests/ui/parser/ranges-precedence.rs:75:12
   |
LL |         ($e:expr) => {};
   |          ------- while parsing argument for this `expr` macro fragment
LL |     }
LL |     expr!(!..0);
   |            ^^ expected expression

error: expected expression, found `..`
  --> tests/ui/parser/ranges-precedence.rs:76:12
   |
LL |         ($e:expr) => {};
   |          ------- while parsing argument for this `expr` macro fragment
...
LL |     expr!(-..0);
   |            ^^ expected expression

error: expected expression, found `..`
  --> tests/ui/parser/ranges-precedence.rs:77:12
   |
LL |         ($e:expr) => {};
   |          ------- while parsing argument for this `expr` macro fragment
...
LL |     expr!(*..0);
   |            ^^ expected expression

error: aborting due to 3 previous errors
------------------------------------------

Author: dtolnay

tests/ui/parser/ranges-precedence.rs

@@ -1,7 +1,8 @@
 //@ run-pass
+//@ edition: 2021
 // Test that the precedence of ranges is correct
 
-
+use core::ops::{Add, RangeTo};
 
 struct Foo {
     foo: usize,
@@ -11,6 +12,13 @@ impl Foo {
     fn bar(&self) -> usize { 5 }
 }
 
+impl Add<RangeTo<usize>> for Foo {
+    type Output = usize;
+    fn add(self, range: RangeTo<usize>) -> Self::Output {
+        self.foo + range.end
+    }
+}
+
 fn main() {
     let x = 1+3..4+5;
     assert_eq!(x, (4..9));
@@ -49,4 +57,22 @@ fn main() {
 
     let y = ..;
     assert_eq!(y, (..));
+
+    let reference = &..0;
+    assert_eq!(*reference, ..0);
+    let reference2 = &&..0;
+    assert_eq!(**reference2, ..0);
+
+    let closure = || ..0;
+    assert_eq!(closure(), ..0);
+
+    let sum = Foo { foo: 3 } + ..4;
+    assert_eq!(sum, 7);
+
+    macro_rules! expr {
+        ($e:expr) => {};
+    }
+    expr!(!..0);
+    expr!(-..0);
+    expr!(*..0);
 }