Add test of dot after eager statement boundary expr

Author: dtolnay

tests/ui-fulldeps/pprust-parenthesis-insertion.rs

@@ -108,6 +108,10 @@ static EXPRS: &[&str] = &[
     "{ (match 2 {})() - 1 }",
     "{ (match 2 {})[0] - 1 }",
     "{ (loop {}) - 1 }",
+    "match 2 { _ => (loop {}) - 1 }",
+    // No eager statement boundary if followed by `.` or `?`.
+    "{ (loop {}).to_string() - 1 }",  // FIXME: no parenthesis needed.
+    "match 2 { _ => (loop {}).to_string() - 1 }",  // FIXME: no parenthesis needed.
     // Angle bracket is eagerly parsed as a path's generic argument list.
     "(2 as T) < U",
     "(2 as T<U>) < V", // FIXME: no parentheses needed.