Reduce usage of unstable features

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/valid.rs b/tests/valid.rs
index 42cc9f4..5693492 100644
--- a/tests/valid.rs
+++ b/tests/valid.rs
@@ -43,7 +43,7 @@ fn run(toml: &str, json: &str) {
     let table = p.parse();
     assert!(p.errors.len() == 0, "had_errors: {:?}",
             p.errors.iter().map(|e| {
-                (e.desc.clone(), toml.slice(e.lo - 5, e.hi + 5))
+                (e.desc.clone(), &toml[e.lo - 5..e.hi + 5])
             }).collect::<Vec<(String, &str)>>());
     assert!(table.is_some());
     let toml = Table(table.unwrap());