fix new clippy warnings

Cargo.toml

@@ -10,7 +10,7 @@ homepage = "https://laze-build.org"
 license = "Apache-2.0"
 readme = "README.md"
 include = ["src/**/*", "LICENSE", "README.md", "CHANGELOG.md", "!**/tests/**/*", "assets/**/*"]
-rust-version = "1.64.0"  # MSRV (clap needs recent Rust)
+rust-version = "1.70.0"
 
 [dependencies]
 anyhow = "1.0.86"

src/data/import.rs

@@ -33,7 +33,7 @@ pub trait Import: std::hash::Hash {
         let mut res = Utf8PathBuf::from(build_dir.as_ref());
         res.push("imports");
         if let Some(dldir) = self.get_dldir() {
-            res.push(format!("{dldir}"));
+            res.push(dldir);
         } else if let Some(name) = self.get_name() {
             res.push(format!("{name}-{source_hash}"));
         } else {

src/nested_env/expand.rs

@@ -68,14 +68,14 @@ where
         .map_err(ExpandError::Expr))?
 }
 
-fn expand_recursive<'a, SI: 'a, H>(
+fn expand_recursive<'a, SI, H>(
     f: SI,
     r: &HashMap<&String, String, H>,
     seen: Vec<&'a str>,
     if_missing: IfMissing,
 ) -> Result<String, ExpandError>
 where
-    SI: AsRef<str>,
+    SI: 'a + AsRef<str>,
     H: std::hash::BuildHasher,
 {
     let f = f.as_ref();