style(policy): apply nightly fmt

Author: febyeji

src/policy/semantic.rs

@@ -498,8 +498,9 @@ impl<'a> MathParser<'a> {
                     parser.next();
                     let mut frame = frames.pop().unwrap();
                     let op = match frame.kind {
-                        Kind::Group(op) => op
-                            .ok_or_else(|| malformed_math("group with no operator"))?,
+                        Kind::Group(op) => {
+                            op.ok_or_else(|| malformed_math("group with no operator"))?
+                        }
                         Kind::Thresh => {
                             return Err(malformed_math("')' closing a '#{...}' threshold"))
                         }