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-rw-r--r--tvix/eval/src/builtins/impure.rs111
-rw-r--r--tvix/eval/src/builtins/mod.rs130
-rw-r--r--tvix/eval/src/compiler/import.rs105
-rw-r--r--tvix/eval/src/compiler/mod.rs103
-rw-r--r--tvix/eval/src/lib.rs35
-rw-r--r--tvix/eval/src/tests/mod.rs3
6 files changed, 269 insertions, 218 deletions
diff --git a/tvix/eval/src/builtins/impure.rs b/tvix/eval/src/builtins/impure.rs
index d371d877977d..e8c032cc77e6 100644
--- a/tvix/eval/src/builtins/impure.rs
+++ b/tvix/eval/src/builtins/impure.rs
@@ -2,20 +2,17 @@ use builtin_macros::builtins;
 use smol_str::SmolStr;
 
 use std::{
-    collections::BTreeMap,
     env,
-    rc::{Rc, Weak},
+    rc::Rc,
     time::{SystemTime, UNIX_EPOCH},
 };
 
 use crate::{
-    compiler::GlobalsMap,
     errors::ErrorKind,
     io::FileType,
-    observer::NoOpObserver,
-    value::{Builtin, BuiltinArgument, NixAttrs, Thunk},
+    value::{NixAttrs, Thunk},
     vm::VM,
-    SourceCode, Value,
+    Value,
 };
 
 #[builtins]
@@ -67,13 +64,13 @@ mod impure_builtins {
 
 /// Return all impure builtins, that is all builtins which may perform I/O
 /// outside of the VM and so cannot be used in all contexts (e.g. WASM).
-pub(super) fn builtins() -> BTreeMap<&'static str, Value> {
-    let mut map: BTreeMap<&'static str, Value> = impure_builtins::builtins()
+pub fn impure_builtins() -> Vec<(&'static str, Value)> {
+    let mut result = impure_builtins::builtins()
         .into_iter()
-        .map(|b| (b.name(), Value::Builtin(b)))
-        .collect();
+        .map(super::builtin_tuple)
+        .collect::<Vec<_>>();
 
-    map.insert(
+    result.push((
         "storeDir",
         Value::Thunk(Thunk::new_suspended_native(Rc::new(Box::new(
             |vm: &mut VM| match vm.io().store_dir() {
@@ -81,7 +78,7 @@ pub(super) fn builtins() -> BTreeMap<&'static str, Value> {
                 Some(dir) => Ok(Value::String(dir.into())),
             },
         )))),
-    );
+    ));
 
     // currentTime pins the time at which evaluation was started
     {
@@ -92,94 +89,8 @@ pub(super) fn builtins() -> BTreeMap<&'static str, Value> {
             Err(err) => -(err.duration().as_secs() as i64),
         };
 
-        map.insert("currentTime", Value::Integer(seconds));
+        result.push(("currentTime", Value::Integer(seconds)));
     }
 
-    map
-}
-
-/// Constructs and inserts the `import` builtin. This builtin is special in that
-/// it needs to capture the [crate::SourceCode] structure to correctly track
-/// source code locations while invoking a compiler.
-// TODO: need to be able to pass through a CompilationObserver, too.
-pub fn builtins_import(globals: &Weak<GlobalsMap>, source: SourceCode) -> Builtin {
-    // This (very cheap, once-per-compiler-startup) clone exists
-    // solely in order to keep the borrow checker happy.  It
-    // resolves the tension between the requirements of
-    // Rc::new_cyclic() and Builtin::new()
-    let globals = globals.clone();
-
-    Builtin::new(
-        "import",
-        &[BuiltinArgument {
-            strict: true,
-            name: "path",
-        }],
-        None,
-        move |mut args: Vec<Value>, vm: &mut VM| {
-            let mut path = super::coerce_value_to_path(&args.pop().unwrap(), vm)?;
-            if path.is_dir() {
-                path.push("default.nix");
-            }
-
-            let current_span = vm.current_light_span();
-
-            if let Some(cached) = vm.import_cache.get(&path) {
-                return Ok(cached.clone());
-            }
-
-            let contents = vm.io().read_to_string(path.clone())?;
-
-            let parsed = rnix::ast::Root::parse(&contents);
-            let errors = parsed.errors();
-
-            let file = source.add_file(path.to_string_lossy().to_string(), contents);
-
-            if !errors.is_empty() {
-                return Err(ErrorKind::ImportParseError {
-                    path,
-                    file,
-                    errors: errors.to_vec(),
-                });
-            }
-
-            let result = crate::compiler::compile(
-                &parsed.tree().expr().unwrap(),
-                Some(path.clone()),
-                file,
-                // The VM must ensure that a strong reference to the
-                // globals outlives any self-references (which are
-                // weak) embedded within the globals.  If the
-                // expect() below panics, it means that did not
-                // happen.
-                globals
-                    .upgrade()
-                    .expect("globals dropped while still in use"),
-                &mut NoOpObserver::default(),
-            )
-            .map_err(|err| ErrorKind::ImportCompilerError {
-                path: path.clone(),
-                errors: vec![err],
-            })?;
-
-            if !result.errors.is_empty() {
-                return Err(ErrorKind::ImportCompilerError {
-                    path,
-                    errors: result.errors,
-                });
-            }
-
-            // Compilation succeeded, we can construct a thunk from whatever it spat
-            // out and return that.
-            let res = Value::Thunk(Thunk::new_suspended(result.lambda, current_span));
-
-            vm.import_cache.insert(path, res.clone());
-
-            for warning in result.warnings {
-                vm.push_warning(warning);
-            }
-
-            Ok(res)
-        },
-    )
+    result
 }
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs
index 2e043a1b104f..01ef1678c7ee 100644
--- a/tvix/eval/src/builtins/mod.rs
+++ b/tvix/eval/src/builtins/mod.rs
@@ -3,17 +3,15 @@
 //! See //tvix/eval/docs/builtins.md for a some context on the
 //! available builtins in Nix.
 
-use crate::compiler::{GlobalsMap, GlobalsMapFunc};
-use crate::source::SourceCode;
-use crate::value::BuiltinArgument;
 use std::cmp::{self, Ordering};
-use std::collections::{BTreeMap, HashMap, HashSet};
+use std::collections::{BTreeMap, HashSet};
 use std::path::PathBuf;
-use std::rc::Rc;
 
 use builtin_macros::builtins;
 use regex::Regex;
 
+use crate::arithmetic_op;
+use crate::value::BuiltinArgument;
 use crate::warnings::WarningKind;
 use crate::{
     errors::{ErrorKind, EvalResult},
@@ -21,13 +19,18 @@ use crate::{
     vm::VM,
 };
 
-use crate::arithmetic_op;
-
 use self::versions::{VersionPart, VersionPartsIter};
 
+mod versions;
+
 #[cfg(feature = "impure")]
-pub mod impure;
-pub mod versions;
+mod impure;
+
+#[cfg(feature = "impure")]
+pub use impure::impure_builtins;
+
+// we set TVIX_CURRENT_SYSTEM in build.rs
+pub const CURRENT_PLATFORM: &str = env!("TVIX_CURRENT_SYSTEM");
 
 /// Coerce a Nix Value to a plain path, e.g. in order to access the
 /// file it points to via either `builtins.toPath` or an impure
@@ -942,15 +945,37 @@ mod pure_builtins {
     }
 }
 
-pub use pure_builtins::builtins as pure_builtins;
+fn builtin_tuple(builtin: Builtin) -> (&'static str, Value) {
+    (builtin.name(), Value::Builtin(builtin))
+}
+
+/// The set of standard pure builtins in Nix, mostly concerned with
+/// data structure manipulation (string, attrs, list, etc. functions).
+pub fn pure_builtins() -> Vec<(&'static str, Value)> {
+    let mut result = pure_builtins::builtins()
+        .into_iter()
+        .map(builtin_tuple)
+        .collect::<Vec<_>>();
+
+    // Pure-value builtins
+    result.push(("nixVersion", Value::String("2.3-compat-tvix-0.1".into())));
+    result.push(("langVersion", Value::Integer(6)));
+
+    result.push((
+        "currentSystem",
+        crate::systems::llvm_triple_to_nix_double(CURRENT_PLATFORM).into(),
+    ));
+
+    result
+}
 
 /// Placeholder builtins that technically have a function which we do
 /// not yet implement, but which is also not easily observable from
 /// within a pure evaluation context.
 ///
 /// These are used as a crutch to make progress on nixpkgs evaluation.
-fn placeholders() -> Vec<Builtin> {
-    vec![
+pub fn placeholders() -> Vec<(&'static str, Value)> {
+    let ph = vec![
         Builtin::new(
             "addErrorContext",
             &[
@@ -1041,84 +1066,7 @@ fn placeholders() -> Vec<Builtin> {
                 Ok(Value::Attrs(Box::new(attrs)))
             },
         ),
-    ]
-}
-// we set TVIX_CURRENT_SYSTEM in build.rs
-pub const CURRENT_PLATFORM: &str = env!("TVIX_CURRENT_SYSTEM");
-
-/// Set of Nix builtins that are globally available.
-pub fn global_builtins(source: SourceCode) -> GlobalsMapFunc {
-    Box::new(move |globals: &std::rc::Weak<GlobalsMap>| {
-        let mut map: BTreeMap<&'static str, Value> = BTreeMap::new();
-
-        // Pure-value builtins
-        map.insert("nixVersion", Value::String("2.3-compat-tvix-0.1".into()));
-
-        map.insert("langVersion", Value::Integer(6));
-
-        map.insert(
-            "currentSystem",
-            crate::systems::llvm_triple_to_nix_double(CURRENT_PLATFORM).into(),
-        );
-
-        let mut add_builtins = |builtins: Vec<Builtin>| {
-            for builtin in builtins {
-                map.insert(builtin.name(), Value::Builtin(builtin));
-            }
-        };
-
-        add_builtins(pure_builtins());
-        add_builtins(placeholders());
-
-        #[cfg(feature = "impure")]
-        {
-            map.extend(impure::builtins());
-
-            // We need to insert import into the builtins, but the
-            // builtins passed to import must have import *in it*.
-            let import = Value::Builtin(crate::builtins::impure::builtins_import(globals, source));
-
-            map.insert("import", import);
-        };
-
-        let mut globals: GlobalsMap = HashMap::new();
-
-        let builtins = Rc::new(NixAttrs::from_iter(map.into_iter()));
-
-        // known global builtins from the builtins set.
-        for global in &[
-            "abort",
-            "baseNameOf",
-            "derivation",
-            "derivationStrict",
-            "dirOf",
-            "fetchGit",
-            "fetchMercurial",
-            "fetchTarball",
-            "fromTOML",
-            "import",
-            "isNull",
-            "map",
-            "placeholder",
-            "removeAttrs",
-            "scopedImport",
-            "throw",
-            "toString",
-        ] {
-            if let Some(builtin) = builtins.select(global) {
-                let builtin = builtin.clone();
-                globals.insert(
-                    global,
-                    Rc::new(move |c, s| c.emit_constant(builtin.clone(), &s)),
-                );
-            }
-        }
-
-        globals.insert(
-            "builtins",
-            Rc::new(move |c, s| c.emit_constant(Value::attrs(builtins.as_ref().clone()), &s)),
-        );
+    ];
 
-        globals
-    })
+    ph.into_iter().map(builtin_tuple).collect()
 }
diff --git a/tvix/eval/src/compiler/import.rs b/tvix/eval/src/compiler/import.rs
new file mode 100644
index 000000000000..3a8847f2cbb4
--- /dev/null
+++ b/tvix/eval/src/compiler/import.rs
@@ -0,0 +1,105 @@
+//! This module implements the Nix language's `import` feature, which
+//! is exposed as a builtin in the Nix language.
+//!
+//! This is not a typical builtin, as it needs access to internal
+//! compiler and VM state (such as the [`crate::SourceCode`]
+//! instance, or observers).
+
+use std::rc::Weak;
+
+use crate::{
+    observer::NoOpObserver,
+    value::{Builtin, BuiltinArgument, Thunk},
+    vm::VM,
+    ErrorKind, SourceCode, Value,
+};
+
+use super::GlobalsMap;
+use crate::builtins::coerce_value_to_path;
+
+/// Constructs and inserts the `import` builtin. This builtin is special in that
+/// it needs to capture the [crate::SourceCode] structure to correctly track
+/// source code locations while invoking a compiler.
+// TODO: need to be able to pass through a CompilationObserver, too.
+// TODO: can the `SourceCode` come from the compiler?
+pub(super) fn builtins_import(globals: &Weak<GlobalsMap>, source: SourceCode) -> Builtin {
+    // This (very cheap, once-per-compiler-startup) clone exists
+    // solely in order to keep the borrow checker happy.  It
+    // resolves the tension between the requirements of
+    // Rc::new_cyclic() and Builtin::new()
+    let globals = globals.clone();
+
+    Builtin::new(
+        "import",
+        &[BuiltinArgument {
+            strict: true,
+            name: "path",
+        }],
+        None,
+        move |mut args: Vec<Value>, vm: &mut VM| {
+            let mut path = coerce_value_to_path(&args.pop().unwrap(), vm)?;
+            if path.is_dir() {
+                path.push("default.nix");
+            }
+
+            let current_span = vm.current_light_span();
+
+            if let Some(cached) = vm.import_cache.get(&path) {
+                return Ok(cached.clone());
+            }
+
+            let contents = vm.io().read_to_string(path.clone())?;
+
+            let parsed = rnix::ast::Root::parse(&contents);
+            let errors = parsed.errors();
+
+            let file = source.add_file(path.to_string_lossy().to_string(), contents);
+
+            if !errors.is_empty() {
+                return Err(ErrorKind::ImportParseError {
+                    path,
+                    file,
+                    errors: errors.to_vec(),
+                });
+            }
+
+            let result = crate::compiler::compile(
+                &parsed.tree().expr().unwrap(),
+                Some(path.clone()),
+                file,
+                // The VM must ensure that a strong reference to the
+                // globals outlives any self-references (which are
+                // weak) embedded within the globals.  If the
+                // expect() below panics, it means that did not
+                // happen.
+                globals
+                    .upgrade()
+                    .expect("globals dropped while still in use"),
+                &mut NoOpObserver::default(),
+            )
+            .map_err(|err| ErrorKind::ImportCompilerError {
+                path: path.clone(),
+                errors: vec![err],
+            })?;
+
+            if !result.errors.is_empty() {
+                return Err(ErrorKind::ImportCompilerError {
+                    path,
+                    errors: result.errors,
+                });
+            }
+
+            // Compilation succeeded, we can construct a thunk from whatever it spat
+            // out and return that.
+            let res = Value::Thunk(Thunk::new_suspended(result.lambda, current_span));
+
+            vm.import_cache.insert(path, res.clone());
+
+            for warning in result.warnings {
+                vm.push_warning(warning);
+            }
+
+            Ok(res)
+        },
+    )
+}
diff --git a/tvix/eval/src/compiler/mod.rs b/tvix/eval/src/compiler/mod.rs
index 12fd269c2f9b..4a44f95691c0 100644
--- a/tvix/eval/src/compiler/mod.rs
+++ b/tvix/eval/src/compiler/mod.rs
@@ -14,6 +14,7 @@
 //! mistakes early during development.
 
 mod bindings;
+mod import;
 mod scope;
 
 use codemap::Span;
@@ -30,8 +31,9 @@ use crate::observer::CompilerObserver;
 use crate::opcode::{CodeIdx, Count, JumpOffset, OpCode, UpvalueIdx};
 use crate::spans::LightSpan;
 use crate::spans::ToSpan;
-use crate::value::{Closure, Formals, Lambda, Thunk, Value};
+use crate::value::{Closure, Formals, Lambda, NixAttrs, Thunk, Value};
 use crate::warnings::{EvalWarning, WarningKind};
+use crate::SourceCode;
 
 use self::scope::{LocalIdx, LocalPosition, Scope, Upvalue, UpvalueKind};
 
@@ -73,17 +75,38 @@ impl LambdaCtx {
     }
 }
 
+/// The type of a global as used inside of the compiler. Differs from
+/// Nix's own notion of "builtins" in that it can emit arbitrary code.
+/// Nix's builtins are wrapped inside of this type.
+pub type Global = Rc<dyn Fn(&mut Compiler, Span)>;
+
 /// The map of globally available functions that should implicitly
 /// be resolvable in the global scope.
-pub type GlobalsMap = HashMap<&'static str, Rc<dyn Fn(&mut Compiler, Span)>>;
-
-/// Functions with this type are used to construct a
-/// self-referential `builtins` object; it takes a weak reference to
-/// its own result, similar to how nixpkgs' overlays work.
-/// Rc::new_cyclic() is what "ties the knot".  The heap allocation
-/// (Box) and vtable (dyn) do not impair runtime or compile-time
-/// performance; they exist only during compiler startup.
-pub type GlobalsMapFunc = Box<dyn FnOnce(&Weak<GlobalsMap>) -> GlobalsMap>;
+type GlobalsMap = HashMap<&'static str, Rc<dyn Fn(&mut Compiler, Span)>>;
+
+/// Set of builtins that (if they exist) should be made available in
+/// the global scope, meaning that they can be accessed not just
+/// through `builtins.<name>`, but directly as `<name>`. This is not
+/// configurable, it is based on what Nix 2.3 exposed.
+const GLOBAL_BUILTINS: &'static [&'static str] = &[
+    "abort",
+    "baseNameOf",
+    "derivation",
+    "derivationStrict",
+    "dirOf",
+    "fetchGit",
+    "fetchMercurial",
+    "fetchTarball",
+    "fromTOML",
+    "import",
+    "isNull",
+    "map",
+    "placeholder",
+    "removeAttrs",
+    "scopedImport",
+    "throw",
+    "toString",
+];
 
 pub struct Compiler<'observer> {
     contexts: Vec<LambdaCtx>,
@@ -1183,19 +1206,57 @@ fn optimise_tail_call(chunk: &mut Chunk) {
     }
 }
 
-/// Prepare the full set of globals from additional globals supplied
-/// by the caller of the compiler, as well as the built-in globals
-/// that are always part of the language.  This also "ties the knot"
-/// required in order for import to have a reference cycle back to
-/// the globals.
+/// Prepare the full set of globals available in evaluated code. These
+/// are constructed from the set of builtins supplied by the caller,
+/// which are made available globally under the `builtins` identifier.
+///
+/// A subset of builtins (specified by [`GLOBAL_BUILTINS`]) is
+/// available globally *iff* they are set.
 ///
-/// Note that all builtin functions are *not* considered part of the
-/// language in this sense and MUST be supplied as additional global
-/// values, including the `builtins` set itself.
-pub fn prepare_globals(additional: GlobalsMapFunc) -> Rc<GlobalsMap> {
-    Rc::new_cyclic(Box::new(|weak: &Weak<GlobalsMap>| {
-        let mut globals = additional(weak);
+/// Optionally adds the `import` feature if desired by the caller.
+pub fn prepare_globals(
+    builtins: Vec<(&'static str, Value)>,
+    source: SourceCode,
+    enable_import: bool,
+) -> Rc<GlobalsMap> {
+    Rc::new_cyclic(Box::new(move |weak: &Weak<GlobalsMap>| {
+        // First step is to construct the builtins themselves as
+        // `NixAttrs`.
+        let mut builtins_under_construction: HashMap<&'static str, Value> =
+            HashMap::from_iter(builtins.into_iter());
+
+        // At this point, optionally insert `import` if enabled. To
+        // "tie the knot" of `import` needing the full set of globals
+        // to instantiate its compiler, the `Weak` reference is passed
+        // here.
+        if enable_import {
+            let import = Value::Builtin(import::builtins_import(weak, source));
+            builtins_under_construction.insert("import", import);
+        }
+
+        // Next, the actual map of globals is constructed and
+        // populated with (copies) of the values that should be
+        // available in the global scope (see [`GLOBAL_BUILTINS`]).
+        let mut globals: GlobalsMap = HashMap::new();
+
+        for global in GLOBAL_BUILTINS {
+            if let Some(builtin) = builtins_under_construction.get(global).cloned() {
+                let global_builtin: Global =
+                    Rc::new(move |c, s| c.emit_constant(builtin.clone(), &s));
+                globals.insert(global, global_builtin);
+            }
+        }
+
+        // This is followed by the actual `builtins` attribute set
+        // being constructed and inserted in the global scope.
+        let builtins_set =
+            Value::attrs(NixAttrs::from_iter(builtins_under_construction.into_iter()));
+        globals.insert(
+            "builtins",
+            Rc::new(move |c, s| c.emit_constant(builtins_set.clone(), &s)),
+        );
 
+        // Finally insert the compiler-internal "magic" builtins for top-level values.
         globals.insert(
             "true",
             Rc::new(|compiler, span| {
diff --git a/tvix/eval/src/lib.rs b/tvix/eval/src/lib.rs
index a467a1884c41..fa76aca56ba7 100644
--- a/tvix/eval/src/lib.rs
+++ b/tvix/eval/src/lib.rs
@@ -12,7 +12,7 @@
 //! These features are optional and the API of this crate exposes functionality
 //! for controlling how they work.
 
-mod builtins;
+pub mod builtins;
 mod chunk;
 mod compiler;
 mod errors;
@@ -41,7 +41,6 @@ use std::str::FromStr;
 use std::sync::Arc;
 
 // Re-export the public interface used by other crates.
-pub use crate::builtins::global_builtins;
 pub use crate::compiler::{compile, prepare_globals};
 pub use crate::errors::{Error, ErrorKind, EvalResult};
 pub use crate::io::{DummyIO, EvalIO, FileType};
@@ -83,12 +82,24 @@ pub struct Evaluation<'code, 'co, 'ro> {
     /// Top-level file reference for this code inside the source map.
     file: Arc<codemap::File>,
 
+    /// Set of all builtins that should be available during the
+    /// evaluation.
+    ///
+    /// This defaults to all pure builtins. Users might want to add
+    /// the set of impure builtins, or other custom builtins.
+    pub builtins: Vec<(&'static str, Value)>,
+
     /// Implementation of file-IO to use during evaluation, e.g. for
     /// impure builtins.
     ///
     /// Defaults to [`DummyIO`] if not set explicitly.
     pub io_handle: Box<dyn EvalIO>,
 
+    /// Determines whether the `import` builtin should be made
+    /// available. Note that this depends on the `io_handle` being
+    /// able to read the files specified as arguments to `import`.
+    pub enable_import: bool,
+
     /// (optional) Nix search path, e.g. the value of `NIX_PATH` used
     /// for resolving items on the search path (such as `<nixpkgs>`).
     pub nix_path: Option<String>,
@@ -134,18 +145,34 @@ impl<'code, 'co, 'ro> Evaluation<'code, 'co, 'ro> {
 
         let file = source_map.add_file(location_str, code.into());
 
+        let mut builtins = builtins::pure_builtins();
+        builtins.extend(builtins::placeholders()); // these are temporary
+
         Evaluation {
             code,
             location,
             source_map,
             file,
+            builtins,
             io_handle: Box::new(DummyIO {}),
+            enable_import: false,
             nix_path: None,
             compiler_observer: None,
             runtime_observer: None,
         }
     }
 
+    #[cfg(feature = "impure")]
+    /// Initialise an `Evaluation` for the given snippet, with all
+    /// impure features turned on by default.
+    pub fn new_impure(code: &'code str, location: Option<PathBuf>) -> Self {
+        let mut eval = Self::new(code, location);
+        eval.enable_import = true;
+        eval.builtins.extend(builtins::impure_builtins());
+        eval.io_handle = Box::new(StdIO);
+        eval
+    }
+
     /// Clone the reference to the contained source code map. This is used after
     /// an evaluation for pretty error printing.
     pub fn source_map(&self) -> SourceCode {
@@ -173,8 +200,8 @@ impl<'code, 'co, 'ro> Evaluation<'code, 'co, 'ro> {
         // access to the parsed expression.
         result.expr = parsed.tree().expr();
 
-        let builtins =
-            crate::compiler::prepare_globals(Box::new(global_builtins(self.source_map())));
+        let source = self.source_map();
+        let builtins = crate::compiler::prepare_globals(self.builtins, source, self.enable_import);
 
         let mut noop_observer = observer::NoOpObserver::default();
         let compiler_observer = self.compiler_observer.take().unwrap_or(&mut noop_observer);
diff --git a/tvix/eval/src/tests/mod.rs b/tvix/eval/src/tests/mod.rs
index bb46cf2b79b0..b9bb6d8cf311 100644
--- a/tvix/eval/src/tests/mod.rs
+++ b/tvix/eval/src/tests/mod.rs
@@ -17,8 +17,7 @@ fn eval_test(code_path: &str, expect_success: bool) {
         return;
     }
 
-    let mut eval = crate::Evaluation::new(&code, Some(code_path.into()));
-    eval.io_handle = Box::new(crate::StdIO);
+    let eval = crate::Evaluation::new_impure(&code, Some(code_path.into()));
 
     let result = eval.evaluate();