From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Mon, 19 Jul 2021 23:44:04 +0000 (+0100)
Subject: lowering: Do not construct range iter for empty plan entries
X-Git-Tag: otter-0.7.2~25
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=9b0e2ae30a5e50ed7c61a3c289aac0c86c06f9db;p=otter.git

lowering: Do not construct range iter for empty plan entries

We are going to want to let these have malformed reanges.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/templates/script.ts b/templates/script.ts
index 1a898ce0..6f070409 100644
--- a/templates/script.ts
+++ b/templates/script.ts
@@ -798,7 +798,8 @@ function lower_pieces(targets_todo: LowerTodoList):
   for (const pe of plan) {
     let z_top = pe.z_top;
     let z_bot = pe.z_bot;
-    if (pe.content.length != 0 && z_bot == null) {
+    if (! pe.content.length) continue;
+    if (z_bot == null) {
       let first_z = pe.content[0].p.z;
       if (z_top >= first_z)
 	z_top = first_z;