elastic-arm-c3833f78: building 7qmjjdyzlp8mdf8yay5cfvm123cnprn8-iets-fmt-0.2.0.drv
cargoVendorDir not set, will not automatically configure vendored sources
cargoArtifacts not set, will not reuse any cargo artifacts
Running phase: unpackPhase
unpacking source archive /nix/store/a28krxxy5hjz7mk3q4v1rdbk4n3dyd9k-source
source root is source
Running phase: patchPhase
Executing configureCargoCommonVars
Running phase: updateAutotoolsGnuConfigScriptsPhase
Running phase: configurePhase
default configurePhase, nothing to do
Running phase: buildPhase
+++ command cargo --version
cargo 1.99.0 (5f94df478 2026-08-27)
+++ command cargo fmt -- --check
Diff in /build/source/src/compile/mod.rs:73:
 /// Intermediate attrpath-merged binding tree, mirroring Nix's `addAttr`.
 /// Every variable reference is a `Var` or an `inherit` name.
 fn var_uses(ast: &Ast) -> FxHashMap<Sym, Vec<u32>> {
-    let vars = ast.exprs.iter().zip(&ast.spans).filter_map(|(e, s)| match e {
-        Expr::Var(v) => Some((*v, s)),
-        _ => None,
-    });
+    let vars = ast
+        .exprs
+        .iter()
+        .zip(&ast.spans)
+        .filter_map(|(e, s)| match e {
+            Expr::Var(v) => Some((*v, s)),
+            _ => None,
+        });
     let inherits = ast.names.iter().map(|(v, s)| (*v, s));
     let mut m: FxHashMap<Sym, Vec<u32>> = FxHashMap::default();
     for (v, s) in vars.chain(inherits) {