diff --git a/nix-js/runtime-ts/src/builtins/attrs.ts b/nix-js/runtime-ts/src/builtins/attrs.ts
index e0be552..4484b45 100644
--- a/nix-js/runtime-ts/src/builtins/attrs.ts
+++ b/nix-js/runtime-ts/src/builtins/attrs.ts
@@ -31,6 +31,7 @@ export const hasAttr =
   (set: NixValue): boolean =>
     Object.hasOwn(forceAttrs(set), forceStringValue(s));
 
+let counter = 0;
 export const mapAttrs =
   (f: NixValue) =>
   (attrs: NixValue): NixAttrs => {
@@ -38,7 +39,8 @@ export const mapAttrs =
     const forcedF = forceFunction(f);
     const newAttrs: NixAttrs = {};
     for (const key in forcedAttrs) {
-      newAttrs[key] = createThunk(() => forceFunction(forcedF(key))(forcedAttrs[key]));
+      newAttrs[key] = createThunk(() => forceFunction(forcedF(key))(forcedAttrs[key]), `created by mapAttrs (${counter})`);
+      counter += 1;
     }
     return newAttrs;
   };
diff --git a/nix-js/runtime-ts/src/builtins/index.ts b/nix-js/runtime-ts/src/builtins/index.ts
index f369d43..3da9bb9 100644
--- a/nix-js/runtime-ts/src/builtins/index.ts
+++ b/nix-js/runtime-ts/src/builtins/index.ts
@@ -249,11 +249,11 @@ export const builtins: any = {
   tryEval: mkPrimop(misc.tryEval, "tryEval", 1),
   zipAttrsWith: mkPrimop(misc.zipAttrsWith, "zipAttrsWith", 2),
 
-  builtins: createThunk(() => builtins),
+  builtins: createThunk(() => builtins, "builtins"),
   currentSystem: createThunk(() => {
     return "x86_64-linux";
-  }),
-  currentTime: createThunk(() => Date.now()),
+  }, "currentSystem"),
+  currentTime: createThunk(() => Date.now(), "currentTime"),
 
   false: false,
   true: true,
diff --git a/nix-js/runtime-ts/src/builtins/misc.ts b/nix-js/runtime-ts/src/builtins/misc.ts
index 2e92601..adda38d 100644
--- a/nix-js/runtime-ts/src/builtins/misc.ts
+++ b/nix-js/runtime-ts/src/builtins/misc.ts
@@ -7,7 +7,7 @@ import { CatchableError } from "../types";
 import type { NixAttrs, NixBool, NixStrictValue, NixValue } from "../types";
 import { forceList, forceAttrs, forceFunction, forceStringValue, forceString } from "../type-assert";
 import * as context from "./context";
-import { compareValues, op } from "../operators";
+import { compareValues } from "../operators";
 import { isBool, isFloat, isInt, isList, isString, typeOf } from "./type-check";
 import { OrderedSet } from "js-sdsl";
 import {
@@ -15,13 +15,13 @@ import {
   getStringValue,
   getStringContext,
   mkStringWithContext,
-  mergeContexts,
 } from "../string-context";
 
 export const addErrorContext =
   (e1: NixValue) =>
-  (e2: NixValue): never => {
-    throw new Error("Not implemented: addErrorContext");
+  (e2: NixValue): NixValue => {
+    console.log("[WARNING]: addErrorContext not implemented");
+    return e2;
   };
 
 export const appendContext = context.appendContext;
diff --git a/nix-js/runtime-ts/src/types.ts b/nix-js/runtime-ts/src/types.ts
index b6bf0ec..6537288 100644
--- a/nix-js/runtime-ts/src/types.ts
+++ b/nix-js/runtime-ts/src/types.ts
@@ -62,11 +62,16 @@ export class NixArgs {
     }
   }
 }
-export const mkFunction = (f: (arg: NixValue) => NixValue, required: string[], optional: string[], ellipsis: boolean): NixFunction => {
+export const mkFunction = (
+  f: (arg: NixValue) => NixValue,
+  required: string[],
+  optional: string[],
+  ellipsis: boolean,
+): NixFunction => {
   const func = f as NixFunction;
   func.args = new NixArgs(required, optional, ellipsis);
-  return func
-}
+  return func;
+};
 
 /**
  * Interface for lazy thunk values
diff --git a/nix-js/src/context.rs b/nix-js/src/context.rs
index 0bba013..f00d4eb 100644
--- a/nix-js/src/context.rs
+++ b/nix-js/src/context.rs
@@ -47,9 +47,6 @@ mod private {
         fn compile_code(&mut self, source: Source) -> Result<String> {
             self.as_mut().compile_code(source)
         }
-        fn get_current_source(&self) -> Source {
-            self.as_ref().get_current_source()
-        }
         fn get_source(&self, id: usize) -> Source {
             self.as_ref().get_source(id)
         }
diff --git a/nix-js/src/error.rs b/nix-js/src/error.rs
index 0060705..2f36a3a 100644
--- a/nix-js/src/error.rs
+++ b/nix-js/src/error.rs
@@ -1,11 +1,12 @@
+#![allow(unused_assignments)]
+
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+
 use miette::{Diagnostic, NamedSource, SourceSpan};
-use std::{
-    path::{Path, PathBuf},
-    sync::Arc,
-};
 use thiserror::Error;
 
-use crate::{context::Ctx, runtime::RuntimeContext};
+use crate::runtime::RuntimeContext;
 
 pub type Result<T> = core::result::Result<T, Box<Error>>;
 
diff --git a/nix-js/src/fetcher/metadata_cache.rs b/nix-js/src/fetcher/metadata_cache.rs
index 9eb70ad..39180aa 100644
--- a/nix-js/src/fetcher/metadata_cache.rs
+++ b/nix-js/src/fetcher/metadata_cache.rs
@@ -1,3 +1,5 @@
+#![allow(dead_code)]
+
 use rusqlite::{Connection, OptionalExtension, params};
 use serde::{Deserialize, Serialize};
 use std::path::PathBuf;
diff --git a/nix-js/src/ir.rs b/nix-js/src/ir.rs
index 9f021b2..a0f8645 100644
--- a/nix-js/src/ir.rs
+++ b/nix-js/src/ir.rs
@@ -1,5 +1,5 @@
 use derive_more::{IsVariant, TryUnwrap, Unwrap};
-use hashbrown::{HashMap, HashSet};
+use hashbrown::HashMap;
 use rnix::{TextRange, ast};
 use string_interner::symbol::SymbolU32;
 
diff --git a/nix-js/src/ir/downgrade.rs b/nix-js/src/ir/downgrade.rs
index 160c4ad..f0542c4 100644
--- a/nix-js/src/ir/downgrade.rs
+++ b/nix-js/src/ir/downgrade.rs
@@ -401,7 +401,6 @@ impl<Ctx: DowngradeContext> Downgrade<Ctx> for ast::Lambda {
                     pat_entries,
                     alias,
                     arg,
-                    ellipsis,
                     ctx,
                     |ctx, _| self.body().unwrap().downgrade(ctx),
                 )?;
diff --git a/nix-js/src/ir/span_utils.rs b/nix-js/src/ir/span_utils.rs
index bcf1c67..4442faa 100644
--- a/nix-js/src/ir/span_utils.rs
+++ b/nix-js/src/ir/span_utils.rs
@@ -1,3 +1,5 @@
+#![allow(unused)]
+
 use rnix::TextRange;
 
 pub fn merge_spans(spans: impl IntoIterator<Item = TextRange>) -> TextRange {
@@ -11,10 +13,6 @@ pub fn merge_spans(spans: impl IntoIterator<Item = TextRange>) -> TextRange {
     })
 }
 
-pub fn point_span() -> TextRange {
-    TextRange::new(0.into(), 0.into())
-}
-
 pub fn synthetic_span() -> TextRange {
     TextRange::new(0.into(), 0.into())
 }
diff --git a/nix-js/src/ir/utils.rs b/nix-js/src/ir/utils.rs
index 5d9e150..f0e6c51 100644
--- a/nix-js/src/ir/utils.rs
+++ b/nix-js/src/ir/utils.rs
@@ -225,7 +225,6 @@ pub fn downgrade_pattern_bindings<Ctx>(
     pat_entries: impl Iterator<Item = ast::PatEntry>,
     alias: Option<SymId>,
     arg: ExprId,
-    has_ellipsis: bool,
     ctx: &mut Ctx,
     body_fn: impl FnOnce(&mut Ctx, &[SymId]) -> Result<ExprId>,
 ) -> Result<PatternBindings>
diff --git a/nix-js/src/runtime.rs b/nix-js/src/runtime.rs
index 6b39bb1..eb367d4 100644
--- a/nix-js/src/runtime.rs
+++ b/nix-js/src/runtime.rs
@@ -18,7 +18,6 @@ pub(crate) trait RuntimeContext: 'static {
     fn get_current_dir(&self) -> &Path;
     fn add_source(&mut self, path: Source);
     fn compile_code(&mut self, source: Source) -> Result<String>;
-    fn get_current_source(&self) -> Source;
     fn get_source(&self, id: usize) -> Source;
 }
 
diff --git a/nix-js/src/store.rs b/nix-js/src/store.rs
index 4e78f7f..3b90899 100644
--- a/nix-js/src/store.rs
+++ b/nix-js/src/store.rs
@@ -1,3 +1,5 @@
+#![allow(dead_code)]
+
 mod config;
 mod error;
 mod validation;