diff --git a/.build.yml b/.build.yml
index e8a682a..145b89a 100644
--- a/.build.yml
+++ b/.build.yml
@@ -6,7 +6,11 @@ sources:
   - https://git.sr.ht/~mzhang/e0
 secrets:
   - 0b26b413-7901-41c3-a4e2-3c752228ffcb
+environment:
+  CARGO_UNSTABLE_SPARSE_REGISTRY: "true"
 tasks:
+  - setup: |
+      rustup default nightly
   - test: |
       cd e0
       cargo test --all
diff --git a/ext/e0-vim/syntax/e0.vim b/ext/e0-vim/syntax/e0.vim
index a4dcac0..0b259c5 100644
--- a/ext/e0-vim/syntax/e0.vim
+++ b/ext/e0-vim/syntax/e0.vim
@@ -1,4 +1,7 @@
 syntax keyword e0Conditional if else
 syntax keyword e0PrimitiveType int
-syntax keyword e0Function fn
-syntax keyword e0Statement return
+syntax keyword e0Function fn return
+
+highlight default link e0Conditional Conditional
+highlight default link e0PrimitiveType Type
+highlight default link e0Function Keyword