add ui tests

Author: mark-i-m

src/test/ui/macros/issue-61033-1.rs

@@ -0,0 +1,9 @@
+// Regression test for issue #61033.
+
+macro_rules! test1 {
+    ($x:ident, $($tt:tt)*) => { $($tt)+ } //~ERROR this must repeat at least once
+}
+
+fn main() {
+    test1!(x,);
+}

src/test/ui/macros/issue-61033-1.stderr

@@ -0,0 +1,8 @@
+error: this must repeat at least once
+  --> $DIR/issue-61033-1.rs:4:34
+   |
+LL |     ($x:ident, $($tt:tt)*) => { $($tt)+ }
+   |                                  ^^^^^
+
+error: aborting due to previous error
+

src/test/ui/macros/issue-61033-2.rs

@@ -0,0 +1,19 @@
+// Regression test for issue #61033.
+
+macro_rules! test2 {
+    (
+        $(* $id1:ident)*
+        $(+ $id2:ident)*
+    ) => {
+        $( //~ERROR meta-variable `id1` repeats 2 times
+            $id1 + $id2 // $id1 and $id2 may repeat different numbers of times
+        )*
+    }
+}
+
+fn main() {
+    test2! {
+        * a * b
+        + a + b + c
+    }
+}

src/test/ui/macros/issue-61033-2.stderr

@@ -0,0 +1,11 @@
+error: meta-variable `id1` repeats 2 times, but `id2` repeats 3 times
+  --> $DIR/issue-61033-2.rs:8:10
+   |
+LL |           $(
+   |  __________^
+LL | |             $id1 + $id2 // $id1 and $id2 may repeat different numbers of times
+LL | |         )*
+   | |_________^
+
+error: aborting due to previous error
+