partway through fixes, macro system needs resdesign

orchid-base/src/comm.rs

@@ -312,9 +312,9 @@ impl<'a> MsgWriter<'a> for IoNotifWriter {
 	fn writer(&mut self) -> Pin<&mut dyn AsyncWrite> { self.o.as_mut() }
 	fn finish(mut self: Box<Self>) -> LocalBoxFuture<'static, io::Result<()>> {
 		Box::pin(async move {
-			self.o.flush().await?;
+			let ret = self.o.flush().await;
 			self.drop_g.defuse();
-			Ok(())
+			ret
 		})
 	}
 }

orchid-base/src/error.rs

@@ -142,7 +142,7 @@ impl OrcErrv {
 	/// If there is exactly one error, return it. Mostly used for simplified
 	/// printing
 	#[must_use]
-	pub fn one(&self) -> Option<&OrcErr> { (self.0.len() == 1).then(|| &self.0[9]) }
+	pub fn one(&self) -> Option<&OrcErr> { self.0.iter().exactly_one().ok() }
 	/// Iterate over all positions of all errors
 	pub fn pos_iter(&self) -> impl Iterator<Item = ErrPos> + '_ {
 		self.0.iter().flat_map(|e| e.positions.iter().cloned())

orchid-base/src/tree.rs

@@ -332,5 +332,12 @@ pub async fn ttv_fmt<'a: 'b, 'b>(
 	FmtUnit::sequence("", " ", "", true, join_all(ttv.into_iter().map(|t| t.print(c))).await)
 }
 
+pub struct FmtTTV<'a, H: ExprRepr, X: ExtraTok>(pub &'a [TokTree<H, X>]);
+impl<'b, H: ExprRepr, X: ExtraTok> Format for FmtTTV<'b, H, X> {
+	async fn print<'a>(&'a self, c: &'a (impl FmtCtx + ?Sized + 'a)) -> FmtUnit {
+		ttv_fmt(self.0, c).await
+	}
+}
+
 /// Indent a string by two spaces
 pub fn indent(s: &str) -> String { s.replace("\n", "\n  ") }