Add test for braced-macro followed by . or ?.

Author: m-ou-se

src/test/ui/parser/macro-braces-dot-question.rs

@@ -0,0 +1,9 @@
+// check-pass
+
+use std::io::Write;
+
+fn main() -> Result<(), std::io::Error> {
+    vec! { 1, 2, 3 }.len();
+    write! { vec![], "" }?;
+    Ok(())
+}