feat: stash

src/ty/internal/attrset.rs

@@ -1,15 +1,15 @@
 use std::cell::RefCell;
 use std::sync::Arc;
 
-use anyhow::Result;
 use derive_more::Constructor;
 use rpds::HashTrieMapSync;
 
+use crate::error::Result;
+use crate::vm::VM;
+
 use super::super::common::Symbol;
 use super::super::public as p;
-
 use super::{ToPublic, Value};
-use crate::vm::VM;
 
 #[derive(Debug, Constructor, Clone, PartialEq)]
 pub struct AttrSet {
@@ -28,7 +28,7 @@ impl AttrSet {
     }
 
     pub fn push_attr(&mut self, sym: Symbol, val: Value) {
-        if self.data.get(&sym).is_some() {
+        if let Some(_) = self.data.get_mut(&sym) {
             todo!()
         }
         self.data.insert_mut(sym, val);

src/ty/internal/cnst.rs

@@ -1,6 +1,4 @@
-use anyhow::Error;
 use derive_more::{IsVariant, Unwrap};
-
 use ecow::EcoString;
 
 #[derive(Debug, Clone, IsVariant, Unwrap)]
@@ -47,49 +45,6 @@ impl From<&str> for Const {
     }
 }
 
-impl<'a> TryFrom<&'a Const> for &'a bool {
-    type Error = Error;
-
-    fn try_from(value: &'a Const) -> Result<Self, Self::Error> {
-        match value {
-            Const::Bool(b) => Ok(b),
-            _ => panic!(),
-        }
-    }
-}
-impl<'a> TryFrom<&'a Const> for &'a i64 {
-    type Error = Error;
-
-    fn try_from(value: &'a Const) -> Result<Self, Self::Error> {
-        match value {
-            Const::Int(int) => Ok(int),
-            _ => panic!(),
-        }
-    }
-}
-
-impl<'a> TryFrom<&'a Const> for &'a f64 {
-    type Error = Error;
-
-    fn try_from(value: &'a Const) -> Result<Self, Self::Error> {
-        match value {
-            Const::Float(float) => Ok(float),
-            _ => panic!(),
-        }
-    }
-}
-
-impl<'a> TryFrom<&'a Const> for &'a str {
-    type Error = Error;
-
-    fn try_from(value: &'a Const) -> Result<Self, Self::Error> {
-        match value {
-            Const::String(string) => Ok(string),
-            _ => panic!(),
-        }
-    }
-}
-
 impl PartialEq for Const {
     fn eq(&self, other: &Self) -> bool {
         use Const::*;

src/ty/internal/func.rs

@@ -3,8 +3,8 @@ use itertools::Itertools;
 use rpds::HashTrieMap;
 
 use crate::bytecode::OpCodes;
+use crate::error::Result;
 use crate::ty::internal::{Thunk, Value};
-
 use crate::vm::{CapturedEnv, VM};
 
 #[derive(Debug, Clone)]
@@ -33,7 +33,7 @@ impl Func {
         }
     }
 
-    pub fn call(self, vm: &VM, arg: Value) -> Value {
+    pub fn call(self, vm: &VM, arg: Value) -> Result<Value> {
         use Param::*;
 
         let env = self.env.released();
@@ -71,7 +71,7 @@ impl Func {
             }
         }
 
-        vm.eval(self.opcodes, env).unwrap()
+        vm.eval(self.opcodes, env)
     }
 
     pub fn push_ident_param(&mut self, param: EcoString) {

src/ty/internal/list.rs

@@ -1,11 +1,11 @@
-use anyhow::Result;
 use derive_more::Constructor;
 use rpds::VectorSync;
 
+use crate::error::Result;
 use crate::ty::public as p;
+use crate::vm::VM;
 
 use super::{ToPublic, Value};
-use crate::vm::VM;
 
 #[derive(Debug, Constructor, Clone, PartialEq)]
 pub struct List {

src/ty/internal/mod.rs

@@ -1,7 +1,6 @@
 use std::cell::RefCell;
 use std::sync::Arc;
 
-use anyhow::{Result, anyhow};
 use derive_more::{IsVariant, Unwrap};
 
 use super::common as c;
@@ -11,6 +10,7 @@ use super::public as p;
 use c::Symbol;
 
 use crate::bytecode::OpCodes;
+use crate::error::*;
 use crate::vm::{Env, VM};
 
 mod attrset;
@@ -65,9 +65,10 @@ impl Thunk {
             match &*self.thunk.borrow() {
                 _Thunk::Value(value) => return Ok(value.as_ref().clone()),
                 _Thunk::SuspendedFrom(from) => {
-                    return Err(anyhow!(
-                        "already suspended from {from:p} (infinite recursion encountered)"
-                    ));
+                    return Err(Error::EvalError(format!(
+                        "thunk {:p} already suspended from {from:p} (infinite recursion encountered)",
+                        self as *const Thunk
+                    )));
                 }
                 _Thunk::Code(_) => (),
             }
@@ -77,9 +78,7 @@ impl Thunk {
             _Thunk::SuspendedFrom(self as *const Thunk),
         )
         .unwrap_code();
-        let value = vm
-            .eval(opcodes, self.env.borrow().clone().unwrap())
-            .unwrap();
+        let value = vm.eval(opcodes, self.env.borrow().clone().unwrap())?;
         let _ = std::mem::replace(
             &mut *self.thunk.borrow_mut(),
             _Thunk::Value(value.clone().into()),
@@ -199,9 +198,9 @@ impl Value {
         }
     }
 
-    pub fn call(self, vm: &VM, args: Vec<Value>) -> Value {
+    pub fn call(self, vm: &VM, args: Vec<Value>) -> Result<Value> {
         use Value::*;
-        match self {
+        Ok(match self {
             PrimOp(func) => func.call(vm, args),
             PartialPrimOp(func) => func.call(vm, args),
             mut func @ Value::Func(_) => {
@@ -209,12 +208,12 @@ impl Value {
                 while let Some(arg) = iter.next() {
                     func = match func {
                         PrimOp(func) => {
-                            return func.call(vm, [arg].into_iter().chain(iter).collect());
+                            return Ok(func.call(vm, [arg].into_iter().chain(iter).collect()));
                         }
                         PartialPrimOp(func) => {
-                            return func.call(vm, [arg].into_iter().chain(iter).collect());
+                            return Ok(func.call(vm, [arg].into_iter().chain(iter).collect()));
                         }
-                        Func(func) => func.call(vm, arg),
+                        Func(func) => func.call(vm, arg)?,
                         _ => todo!(),
                     }
                 }
@@ -222,7 +221,7 @@ impl Value {
             }
             x @ Catchable(_) => x,
             _ => todo!(),
-        }
+        })
     }
 
     pub fn not(self) -> Value {