From 703d50648d2379e75243cf945de7ad4faa814c50 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 11 Oct 2020 00:20:03 +0100
Subject: [PATCH] check start

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 zcoord/zcoord.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/zcoord/zcoord.rs b/zcoord/zcoord.rs
index 5b8fa636..0acdd07f 100644
--- a/zcoord/zcoord.rs
+++ b/zcoord/zcoord.rs
@@ -265,7 +265,7 @@ impl Serialize for ZCoord {
 //
 // We can panic if this code is buggy, but not compromise safety.
 
-const DEFAULT_TEXT  : &[u8] = b"gggggggggg";
+const DEFAULT_TEXT  : &[u8] = b"g000000000";
 
 impl Default for ZCoord {
   fn default() -> ZCoord {
@@ -511,6 +511,11 @@ mod test {
       fn tinc(self, exp: &str) -> Self { self.tincdec(exp, IncDecInc) }
       fn tdec(self, exp: &str) -> Self { self.tincdec(exp, IncDecDec) }
     }
+    let start : ZCoord = Default::default();
+    assert_eq!(format!("{}", &start), "g000000000");
+    start.clone_mut()
+      .tinc("g001000000");
+
     mk("000000000a")
       .tinc("000100000a")
       .tinc("000200000a")
-- 
2.30.2