refactor: reorganize crate hierarchy
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@@ -0,0 +1,237 @@
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use fix_bytecode::PrimOpPhase;
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use fix_runtime::{
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AttrSet, BytecodeReader, CallFrame, List, Machine, MachineExt, NixNum, Null, Path, Step,
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StrictValue, Value, VmRuntimeCtx, VmRuntimeCtxExt,
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};
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use gc_arena::{Gc, Mutation};
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use smallvec::SmallVec;
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pub fn start_eq<'gc, M: Machine<'gc>>(
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m: &mut M,
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ctx: &impl VmRuntimeCtx,
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reader: &mut BytecodeReader<'_>,
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mc: &Mutation<'gc>,
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lhs: StrictValue<'gc>,
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rhs: StrictValue<'gc>,
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negate: bool,
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) -> Step {
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match shallow_eq(ctx, lhs, rhs) {
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ShallowEq::True => {
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m.push(Value::new_inline(!negate));
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Step::Continue(())
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}
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ShallowEq::False => {
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m.push(Value::new_inline(negate));
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Step::Continue(())
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}
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ShallowEq::RecurseList(la, lb) => {
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let lhs_init: SmallVec<[Value<'gc>; 4]> = la.inner.borrow().iter().copied().collect();
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let rhs_init: SmallVec<[Value<'gc>; 4]> = lb.inner.borrow().iter().copied().collect();
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enter_eq_machine(m, reader, mc, negate, lhs_init, rhs_init)
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}
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ShallowEq::RecurseAttrs(a, b) => {
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let lhs_init: SmallVec<[Value<'gc>; 4]> = a.entries.iter().map(|&(_, v)| v).collect();
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let rhs_init: SmallVec<[Value<'gc>; 4]> = b.entries.iter().map(|&(_, v)| v).collect();
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enter_eq_machine(m, reader, mc, negate, lhs_init, rhs_init)
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}
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}
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}
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pub fn eq_step<'gc, M: Machine<'gc>>(
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m: &mut M,
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reader: &mut BytecodeReader<'_>,
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mc: &Mutation<'gc>,
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) -> Step {
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let rhs_q = m
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.peek(0)
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.as_gc::<List<'gc>>()
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.expect("eq state corrupted: rhs_queue");
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let lhs_q = m
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.peek(1)
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.as_gc::<List<'gc>>()
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.expect("eq state corrupted: lhs_queue");
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let result = m
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.peek(2)
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.as_inline::<bool>()
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.expect("eq state corrupted: result");
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if !result || lhs_q.inner.borrow().is_empty() {
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return finalize(m, reader);
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}
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let lhs = lhs_q
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.unlock(mc)
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.borrow_mut()
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.pop()
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.expect("non-empty lhs queue");
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let rhs = rhs_q
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.unlock(mc)
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.borrow_mut()
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.pop()
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.expect("non-empty rhs queue");
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m.push(lhs);
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m.push(rhs);
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reader.set_pc(PrimOpPhase::EqForce.ip() as usize);
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Step::Continue(())
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}
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pub fn eq_force<'gc, M: Machine<'gc>>(
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m: &mut M,
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ctx: &mut impl VmRuntimeCtx,
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reader: &mut BytecodeReader<'_>,
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mc: &Mutation<'gc>,
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) -> Step {
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let (lhs, rhs) = m.force_and_retry::<(StrictValue, StrictValue)>(reader, mc)?;
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apply_pair(m, ctx, mc, lhs, rhs);
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reader.set_pc(PrimOpPhase::EqStep.ip() as usize);
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Step::Continue(())
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}
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fn finalize<'gc, M: Machine<'gc>>(m: &mut M, reader: &mut BytecodeReader<'_>) -> Step {
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let _ = m.pop();
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let _ = m.pop();
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let result = m
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.pop()
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.as_inline::<bool>()
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.expect("eq state corrupted: result");
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let negate = m
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.pop()
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.as_inline::<bool>()
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.expect("eq state corrupted: negate");
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m.return_from_primop(Value::new_inline(result ^ negate), reader)
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}
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fn apply_pair<'gc, M: Machine<'gc>>(
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m: &mut M,
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ctx: &impl VmRuntimeCtx,
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mc: &Mutation<'gc>,
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lhs: StrictValue<'gc>,
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rhs: StrictValue<'gc>,
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) {
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match shallow_eq(ctx, lhs, rhs) {
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ShallowEq::True => {}
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ShallowEq::False => {
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m.replace(2, Value::new_inline(false));
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}
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ShallowEq::RecurseList(la, lb) => {
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extend_queues(
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m,
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mc,
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la.inner.borrow().iter().copied(),
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lb.inner.borrow().iter().copied(),
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);
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}
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ShallowEq::RecurseAttrs(a, b) => {
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extend_queues(
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m,
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mc,
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a.entries.iter().map(|&(_, v)| v),
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b.entries.iter().map(|&(_, v)| v),
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);
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}
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}
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}
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fn extend_queues<'gc, M, L, R>(m: &mut M, mc: &Mutation<'gc>, lhs_iter: L, rhs_iter: R)
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where
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M: Machine<'gc>,
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L: IntoIterator<Item = Value<'gc>>,
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R: IntoIterator<Item = Value<'gc>>,
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{
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let rhs_q = m
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.peek(0)
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.as_gc::<List<'gc>>()
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.expect("eq state corrupted: rhs_queue");
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let lhs_q = m
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.peek(1)
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.as_gc::<List<'gc>>()
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.expect("eq state corrupted: lhs_queue");
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let mut lq = lhs_q.unlock(mc).borrow_mut();
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let mut rq = rhs_q.unlock(mc).borrow_mut();
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for (x, y) in lhs_iter.into_iter().zip(rhs_iter) {
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lq.push(x);
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rq.push(y);
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}
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}
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fn enter_eq_machine<'gc, M: Machine<'gc>>(
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m: &mut M,
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reader: &mut BytecodeReader<'_>,
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mc: &Mutation<'gc>,
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negate: bool,
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lhs_init: SmallVec<[Value<'gc>; 4]>,
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rhs_init: SmallVec<[Value<'gc>; 4]>,
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) -> Step {
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let resume_pc = reader.pc();
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m.push_call_frame(CallFrame {
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pc: resume_pc,
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thunk: None,
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env: m.env(),
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});
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m.inc_call_depth();
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m.push(Value::new_inline(negate));
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m.push(Value::new_inline(true));
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m.push(Value::new_gc(List::new(mc, lhs_init)));
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m.push(Value::new_gc(List::new(mc, rhs_init)));
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reader.set_pc(PrimOpPhase::EqStep.ip() as usize);
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Step::Continue(())
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}
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enum ShallowEq<'gc> {
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True,
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False,
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RecurseList(Gc<'gc, List<'gc>>, Gc<'gc, List<'gc>>),
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RecurseAttrs(Gc<'gc, AttrSet<'gc>>, Gc<'gc, AttrSet<'gc>>),
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}
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fn shallow_eq<'gc>(
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ctx: &impl VmRuntimeCtx,
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lhs: StrictValue<'gc>,
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rhs: StrictValue<'gc>,
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) -> ShallowEq<'gc> {
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if let (Some(a), Some(b)) = (lhs.as_num(), rhs.as_num()) {
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let eq = match (a, b) {
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(NixNum::Int(a), NixNum::Int(b)) => a == b,
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(NixNum::Float(a), NixNum::Float(b)) => a == b,
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(NixNum::Int(a), NixNum::Float(b)) => a as f64 == b,
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(NixNum::Float(a), NixNum::Int(b)) => a == b as f64,
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};
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return bool_outcome(eq);
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}
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if let (Some(a), Some(b)) = (lhs.as_inline::<bool>(), rhs.as_inline::<bool>()) {
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return bool_outcome(a == b);
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}
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if lhs.is::<Null>() && rhs.is::<Null>() {
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return ShallowEq::True;
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}
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if let (Some(a), Some(b)) = (lhs.as_inline::<Path>(), rhs.as_inline::<Path>()) {
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return bool_outcome(a.0 == b.0);
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}
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if let (Some(a), Some(b)) = (ctx.get_string(lhs), ctx.get_string(rhs)) {
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return bool_outcome(a == b);
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}
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if let (Some(a), Some(b)) = (lhs.as_gc::<List<'gc>>(), rhs.as_gc::<List<'gc>>()) {
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if a.inner.borrow().len() != b.inner.borrow().len() {
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return ShallowEq::False;
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}
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return ShallowEq::RecurseList(a, b);
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}
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if let (Some(a), Some(b)) = (lhs.as_gc::<AttrSet<'gc>>(), rhs.as_gc::<AttrSet<'gc>>()) {
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let ae = &a.entries;
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let be = &b.entries;
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if ae.len() != be.len() {
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return ShallowEq::False;
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}
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for (l, r) in ae.iter().zip(be.iter()) {
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if l.0 != r.0 {
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return ShallowEq::False;
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}
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}
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return ShallowEq::RecurseAttrs(a, b);
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}
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ShallowEq::False
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}
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fn bool_outcome<'gc>(b: bool) -> ShallowEq<'gc> {
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if b { ShallowEq::True } else { ShallowEq::False }
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}
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