max / quasi

Let a panel splice another panel in `extend` already meant this on a region; a panel refused it because a panel is not a container and had nothing to set. goingson's Sharing section is the screen: eight panels under one heading, and the outer one had no way to say so. It means in a panel what it means on a region, which is why it is the same word rather than a new one, and it takes a guard like every other item.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MptwXZ8k65v19rFmdGAyki

Author: Max Johnson <me@maxj.phd> · 2026-09-04 19:40 UTC

Signed with PGP, not checked

Commit: c8e69971d59818d2f1e95fff520165046f3d5804

Parent: 1f1765a

1 file changed, +16 insertions, -1 deletion

M crates/quasi-declare/src/emit.rs +16 -1

			@@ -1207,9 +1207,24 @@
1207	1207		let value = panel_member(emission)?;
1208	1208		Ok(quote!(#nodes.push(#value);))
1209	1209		}
	1210	+	// The one attribute a panel takes, and it means in a panel what it
	1211	+	// means on a region: splice another shape's nodes in here. A panel
	1212	+	// built out of panels had no spelling until goingson's Sharing
	1213	+	// section, which is eight of them under one heading.
	1214	+	Item::Attribute { name, args, guard } if name == "extend" => {
	1215	+	let spliced = args.iter().map(arg).collect::<Result<Vec<_>>>()?;
	1216	+	let extending = quote!(#(#nodes.extend(#spliced);)*);
	1217	+	guard.as_ref().map_or_else(
	1218	+	\|\| Ok(extending.clone()),
	1219	+	\|guard\| {
	1220	+	let test = predicate(guard)?;
	1221	+	Ok(quote!(if #test { #extending }))
	1222	+	},
	1223	+	)
	1224	+	}
1210	1225		Item::Attribute { name, .. } => Err(syn::Error::new(
1211	1226		name.span(),
1212		-	"a panel has nothing to set: say it on the member it belongs to",
	1227	+	"a panel sets nothing but `extend`: say it on the member it belongs to",
1213	1228		)),
1214	1229		})
1215	1230		.collect()