clippy

core/src/eval/operation.rs

@@ -1149,7 +1149,7 @@ impl<R: ImportResolver, C: Cache> VirtualMachine<R, C> {
                 if let Term::Str(s) = &*t {
                     let json = nix_ffi::eval_to_json(&String::from(s)).map_err(|e| {
                         EvalError::Other(
-                            format!("nix code failed to evaluate:\n {}", e.what().to_string()),
+                            format!("nix code failed to evaluate:\n {}", e.what()),
                             pos,
                         )
                     })?;

core/src/nix_ffi/mod.rs

@@ -1,10 +1,10 @@
 #![cfg(feature = "nix-experimental")]
 #[cxx::bridge]
-mod nix_ffi {
+mod internal {
     unsafe extern "C++" {
         include!("nickel-lang-core/src/nix_ffi/cpp/nix.hh");
         fn eval_to_json(nix_code: &str) -> Result<String>;
     }
 }
 
-pub use nix_ffi::*;
+pub use internal::*;

flake.nix

@@ -171,6 +171,7 @@
           txtFilter = mkFilter ".*txt$";
           snapFilter = mkFilter ".*snap$";
           scmFilter = mkFilter ".*scm$";
+          cxxFilter = mkFilter ".*(cc|hh)$";
           importsFilter = mkFilter ".*/core/tests/integration/imports/imported/.*$"; # include all files that are imported in tests
         in
         pkgs.lib.cleanSourceWith {
@@ -185,6 +186,7 @@
               txtFilter
               snapFilter
               scmFilter
+              cxxFilter
               filterCargoSources
               importsFilter
             ];