3 files changed, 10 insertions, 12 deletions

diff --git a/tvix/serde/examples/nixpkgs.rs b/tvix/serde/examples/nixpkgs.rs
index ad8c4160b5d0..e3c589dba118 100644
--- a/tvix/serde/examples/nixpkgs.rs
+++ b/tvix/serde/examples/nixpkgs.rs
@@ -23,8 +23,8 @@ fn main() {
     }
     "#;
 
-    let result = tvix_serde::from_str_with_config::<Config, _>(code, |eval| {
-        eval.enable_impure(None);
+    let result = tvix_serde::from_str_with_config::<Config, _>(code, |eval_builder| {
+        eval_builder.enable_impure(None)
     });
 
     match result {
diff --git a/tvix/serde/src/de.rs b/tvix/serde/src/de.rs
index 428b9e2e8114..88cb46d618ce 100644
--- a/tvix/serde/src/de.rs
+++ b/tvix/serde/src/de.rs
@@ -3,8 +3,7 @@
 use bstr::ByteSlice;
 use serde::de::value::{MapDeserializer, SeqDeserializer};
 use serde::de::{self, EnumAccess, VariantAccess};
-pub use tvix_eval::Evaluation;
-use tvix_eval::{EvalIO, Value};
+use tvix_eval::{EvalIO, EvaluationBuilder, Value};
 
 use crate::error::Error;
 
@@ -36,7 +35,7 @@ pub fn from_str<'code, T>(src: &'code str) -> Result<T, Error>
 where
     T: serde::Deserialize<'code>,
 {
-    from_str_with_config(src, |_| /* no extra config */ ())
+    from_str_with_config(src, |b| /* no extra config */ b)
 }
 
 /// Evaluate the Nix code in `src`, with extra configuration for the
@@ -44,13 +43,12 @@ where
 pub fn from_str_with_config<'code, T, F>(src: &'code str, config: F) -> Result<T, Error>
 where
     T: serde::Deserialize<'code>,
-    F: FnOnce(&mut Evaluation<Box<dyn EvalIO>>),
+    F: for<'co, 'ro, 'env> FnOnce(
+        EvaluationBuilder<'co, 'ro, 'env, Box<dyn EvalIO>>,
+    ) -> EvaluationBuilder<'co, 'ro, 'env, Box<dyn EvalIO>>,
 {
     // First step is to evaluate the Nix code ...
-    let mut eval = Evaluation::new_pure();
-    config(&mut eval);
-
-    eval.strict = true;
+    let eval = config(EvaluationBuilder::new_pure().strict()).build();
     let result = eval.evaluate(src, None);
 
     if !result.errors.is_empty() {
diff --git a/tvix/serde/src/de_tests.rs b/tvix/serde/src/de_tests.rs
index 1c3acd1c2f52..fea7c8290bd7 100644
--- a/tvix/serde/src/de_tests.rs
+++ b/tvix/serde/src/de_tests.rs
@@ -204,7 +204,7 @@ fn deserialize_enum_all() {
 fn deserialize_with_config() {
     let result: String = from_str_with_config("builtins.testWithConfig", |eval| {
         // Add a literal string builtin that just returns `"ok"`.
-        eval.src_builtins.push(("testWithConfig", "\"ok\""));
+        eval.add_src_builtin("testWithConfig", "\"ok\"")
     })
     .expect("should deserialize");
 
@@ -237,7 +237,7 @@ fn deserialize_with_extra_builtin() {
     let code = "builtins.prependHello \"world\"";
 
     let result: String = from_str_with_config(code, |eval| {
-        eval.builtins.append(&mut test_builtins::builtins());
+        eval.add_builtins(test_builtins::builtins())
     })
     .expect("should deserialize");