diff --git a/Cargo.lock b/Cargo.lock
index e3e474e830..0826b056a2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1101,6 +1101,7 @@ dependencies = [
  "rowan 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hash 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_lexer 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smol_str 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "test_utils 0.1.0",
  "walkdir 2.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]