mformat 2: Insist that builtin libraries have an explicit version

We don't want to be setting the bad example of a missing `format`, and
of course we don't want to be using format=1 either.

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

diff --git a/src/shapelib.rs b/src/shapelib.rs
index 83d39f92b4b5c50b10d7fdabfb5535d7aa1dd71f..d853b3b2cdd18b1cd5a53191a827f920020f572d 100644 (file)
--- a/src/shapelib.rs
+++ b/src/shapelib.rs
@@ -910,7 +910,7 @@ impl LibrarySource for BuiltinLibrary<'_> {
 
   #[throws(materials_format::VersionError)]
   fn default_materials_format(&self) -> materials_format::Version {
-    1.try_into().unwrap() // TODO
+    throw!(MFVE::Other("builtin libraries must have explicit version now!"));
   }
 }