fix: format msrv
@@ -168,7 +168,7 @@ pub(crate) fn merge_env(
.iter()
.chain(scc.first())
.map(ToString::to_string)
- .reduce(|acc, name| format!("{acc} -> {name}"));
+ .reduce(|acc, name| format!("{} -> {}", acc, name));
if let Some(render) = render {
err.push_str(&format!(" Cycle: {}.", render));
