Correctly halts

orchid-host/src/sys_parser.rs

@@ -35,12 +35,11 @@ impl Parser {
 		comments: Vec<Comment>,
 		callback: &mut impl AsyncFnMut(ModPath<'_>, Vec<ParsTokTree>) -> OrcRes<Vec<Item>>,
 	) -> OrcRes<Vec<Item>> {
+		let mut temp_store = self.system.ext().exprs().derive(true);
 		let src_path = line.first().expect("cannot be empty").sr.path();
-		let line = join_all(
-			(line.into_iter())
-				.map(|t| async { tt_to_api(&mut self.system.ext().exprs().clone(), t).await }),
-		)
-		.await;
+		let line =
+			join_all((line.into_iter()).map(|t| async { tt_to_api(&mut temp_store.clone(), t).await }))
+				.await;
 		let mod_path = ctx.src_path().suffix(path.unreverse(), self.system.i()).await;
 		let comments = comments.iter().map(Comment::to_api).collect_vec();
 		let req = api::ParseLine {
@@ -53,18 +52,16 @@ impl Parser {
 			line,
 		};
 		match self.system.reqnot().request(req).await {
-			Ok(parsed_v) => {
-				let mut ext_exprs = self.system.ext().exprs().clone();
+			Ok(parsed_v) =>
 				conv(parsed_v, path, callback, &mut ConvCtx {
 					i: self.system.i(),
 					mod_path: &mod_path,
-					ext_exprs: &mut ext_exprs,
+					ext_exprs: &mut temp_store,
 					pctx: &mut ExprParseCtx { ctx: self.system.ctx(), exprs: self.system.ext().exprs() },
 					src_path: &src_path,
 					sys: &self.system,
 				})
-				.await
-			},
+				.await,
 			Err(e) => Err(OrcErrv::from_api(&e, &self.system.ctx().i).await),
 		}
 	}