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Use count! macro in tuple length computation

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This commit is contained in:
Mark Rousskov 2022-02-09 17:32:01 -05:00
parent 19288951e1
commit 6f711a37e3
1 changed files with 2 additions and 3 deletions
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5
compiler/rustc_serialize/src/serialize.rs
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@ -591,9 +591,8 @@ macro_rules! tuple {
#[allow(non_snake_case)]
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
let ($(ref $name,)+) = *self;
let mut n = 0;
$(let $name = $name; n += 1;)+
s.emit_tuple(n, |s| {
let len: usize = count!($($name)+);
s.emit_tuple(len, |s| {
let mut i = 0;
$(s.emit_tuple_arg({ i+=1; i-1 }, |s| $name.encode(s))?;)+
Ok(())