feat: error handling

evaluator/nixjit_value/src/lib.rs

@@ -15,26 +15,6 @@ use std::sync::LazyLock;
 use derive_more::{Constructor, IsVariant, Unwrap};
 use regex::Regex;
 
-/// Represents errors thrown by `assert` and `throw` expressions in Nix.
-/// These errors can potentially be caught and handled by `builtins.tryEval`.
-#[derive(Clone, Debug, PartialEq, Constructor, Hash)]
-pub struct Catchable {
-    /// The error message.
-    msg: String,
-}
-
-impl<T: Into<String>> From<T> for Catchable {
-    fn from(value: T) -> Self {
-        Catchable { msg: value.into() }
-    }
-}
-
-impl Display for Catchable {
-    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
-        write!(f, "<error: {}>", self.msg)
-    }
-}
-
 /// Represents a constant, primitive value in Nix.
 #[derive(Debug, Clone, Copy, PartialEq, IsVariant, Unwrap)]
 pub enum Const {
@@ -206,8 +186,6 @@ pub enum Value {
     AttrSet(AttrSet),
     /// A list.
     List(List),
-    /// A catchable error.
-    Catchable(Catchable),
     /// A thunk, representing a delayed computation.
     Thunk,
     /// A function (lambda).
@@ -229,7 +207,6 @@ impl Display for Value {
             String(x) => write!(f, r#""{x}""#),
             AttrSet(x) => write!(f, "{x}"),
             List(x) => write!(f, "{x}"),
-            Catchable(x) => write!(f, "{x}"),
             Thunk => write!(f, "<CODE>"),
             Func => write!(f, "<LAMBDA>"),
             PrimOp(x) => write!(f, "<PRIMOP {x}>"),