exec working up to halt

clean shutdown doesn't for some reason

orchid-std/src/macros/let_line.rs

@@ -3,13 +3,13 @@ use std::pin::pin;
 use futures::{FutureExt, StreamExt, stream};
 use hashbrown::HashMap;
 use itertools::Itertools;
-use orchid_api::Paren;
 use orchid_base::error::{OrcRes, Reporter};
 use orchid_base::name::Sym;
 use orchid_base::parse::{
 	Comment, ParseCtx, Parsed, Snippet, expect_tok, token_errv, try_pop_no_fluff,
 };
 use orchid_base::sym;
+use orchid_base::tree::Paren;
 use orchid_extension::gen_expr::{atom, call, sym_ref};
 use orchid_extension::parser::{ConstCtx, PSnippet, PTok, PTokTree, ParsCtx, ParsedLine, Parser};