refactor(tvix/eval): Box Value::String r/7467

NixString is *quite* large - like 80 bytes - because of the extra
capacity value for BString and because of the context. We want to keep
Value small since we're passing it around a lot, so let's box the
NixString inside Value::String to save on some memory, and make cloning
ostensibly a little cheaper

Change-Id: I343c8b4e7f61dc3dcbbaba4382efb3b3e5bbabb2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10729
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/tvix/glue/src/tvix_store_io.rs b/tvix/glue/src/tvix_store_io.rs
index fea336e235..4146ededb4 100644
--- a/tvix/glue/src/tvix_store_io.rs
+++ b/tvix/glue/src/tvix_store_io.rs
@@ -356,7 +356,7 @@ mod tests {
 
         let value = result.value.expect("must be some");
         match value {
-            tvix_eval::Value::String(s) => Some((**s).clone().into_string_lossy()),
+            tvix_eval::Value::String(s) => Some((***s).clone().into_string_lossy()),
             _ => panic!("unexpected value type: {:?}", value),
         }
     }
@@ -422,7 +422,7 @@ mod tests {
 
         match value {
             tvix_eval::Value::String(s) => {
-                assert_eq!(s, "/deep/thought");
+                assert_eq!(*s, "/deep/thought");
             }
             _ => panic!("unexpected value type: {:?}", value),
         }