exec working up to halt

clean shutdown doesn't for some reason

orchid-std/src/macros/mactree.rs

@@ -6,14 +6,13 @@ use futures::FutureExt;
 use futures::future::join_all;
 use hashbrown::HashSet;
 use itertools::Itertools;
-use orchid_api::Paren;
 use orchid_base::error::{OrcErrv, Reporter, mk_errv};
 use orchid_base::format::{FmtCtx, FmtUnit, Format, Variants, fmt};
 use orchid_base::interner::Tok;
 use orchid_base::location::Pos;
 use orchid_base::name::Sym;
 use orchid_base::tl_cache;
-use orchid_base::tree::indent;
+use orchid_base::tree::{Paren, indent};
 use orchid_extension::atom::Atomic;
 use orchid_extension::atom_owned::{OwnedAtom, OwnedVariant};
 use orchid_extension::conv::ToExpr;