1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
//@ revisions: rfail1 rfail2
//@ failure-status: 101
//@ error-pattern: not implemented
//@ needs-unwind -Cpanic=abort causes abort instead of exit(101)
pub trait Interner {
type InternedVariableKinds;
}
trait RustIrDatabase<I: Interner> {
fn associated_ty_data(&self) -> AssociatedTyDatum<I>;
fn impl_datum(&self) -> ImplDatum<I>;
}
trait Fold<I: Interner> {
type Result;
}
impl<T, I: Interner> Fold<I> for Binders<T>
where
T: HasInterner<Interner = I> + Fold<I>,
<T as Fold<I>>::Result: HasInterner<Interner = I>,
I: Interner,
{
type Result = Binders<T::Result>;
}
impl<I: Interner> Fold<I> for WhereClause<I> {
type Result = Binders<WhereClause<I>>;
}
trait HasInterner {
type Interner: Interner;
}
impl<T: HasInterner> HasInterner for Vec<T> {
type Interner = T::Interner;
}
impl<T: HasInterner + ?Sized> HasInterner for &T {
type Interner = T::Interner;
}
pub struct VariableKind<I: Interner> {
_marker: std::marker::PhantomData<I>,
}
struct VariableKinds<I: Interner> {
_interned: I::InternedVariableKinds,
}
struct WhereClause<I: Interner> {
_marker: std::marker::PhantomData<I>,
}
impl<I: Interner> HasInterner for WhereClause<I> {
type Interner = I;
}
struct Binders<T> {
_marker: std::marker::PhantomData<T>,
}
impl<T: HasInterner> HasInterner for Binders<T> {
type Interner = T::Interner;
}
impl<T> Binders<&T> {
fn cloned(self) -> Binders<T> {
unimplemented!()
}
}
impl<T: HasInterner> Binders<T> {
fn map_ref<'a, U, OP>(&'a self, _op: OP) -> Binders<U>
where
OP: FnOnce(&'a T) -> U,
U: HasInterner<Interner = T::Interner>,
{
unimplemented!()
}
}
impl<T, I: Interner> Binders<T>
where
T: Fold<I> + HasInterner<Interner = I>,
I: Interner,
{
fn substitute(self) -> T::Result {
unimplemented!()
}
}
impl<V, U> IntoIterator for Binders<V>
where
V: HasInterner + IntoIterator<Item = U>,
U: HasInterner<Interner = V::Interner>,
{
type Item = Binders<U>;
type IntoIter = BindersIntoIterator<V>;
fn into_iter(self) -> Self::IntoIter {
unimplemented!()
}
}
struct BindersIntoIterator<V: HasInterner> {
_binders: VariableKinds<V::Interner>,
}
impl<V> Iterator for BindersIntoIterator<V>
where
V: HasInterner + IntoIterator,
<V as IntoIterator>::Item: HasInterner<Interner = V::Interner>,
{
type Item = Binders<<V as IntoIterator>::Item>;
fn next(&mut self) -> Option<Self::Item> {
unimplemented!()
}
}
struct ImplDatum<I: Interner> {
binders: Binders<ImplDatumBound<I>>,
}
struct ImplDatumBound<I: Interner> {
where_clauses: Vec<Binders<WhereClause<I>>>,
}
impl<I: Interner> HasInterner for ImplDatumBound<I> {
type Interner = I;
}
struct AssociatedTyDatum<I: Interner> {
binders: Binders<AssociatedTyDatumBound<I>>,
}
struct AssociatedTyDatumBound<I: Interner> {
where_clauses: Vec<Binders<WhereClause<I>>>,
}
impl<I: Interner> HasInterner for AssociatedTyDatumBound<I> {
type Interner = I;
}
struct ClauseBuilder<'me, I: Interner> {
db: &'me dyn RustIrDatabase<I>,
}
impl<'me, I: Interner> ClauseBuilder<'me, I> {
fn new() -> Self {
unimplemented!()
}
fn push_clause(&mut self, _conditions: impl Iterator<Item = Binders<Binders<WhereClause<I>>>>) {
unimplemented!()
}
}
pub(crate) struct Forest<I: Interner> {
_marker: std::marker::PhantomData<I>,
}
impl<I: Interner> Forest<I> {
fn iter_answers<'f>(&'f self) {
let builder = &mut ClauseBuilder::<I>::new();
let impl_datum = builder.db.impl_datum();
let impl_where_clauses = impl_datum
.binders
.map_ref(|b| &b.where_clauses)
.into_iter()
.map(|wc| wc.cloned().substitute());
let associated_ty = builder.db.associated_ty_data();
let assoc_ty_where_clauses = associated_ty
.binders
.map_ref(|b| &b.where_clauses)
.into_iter()
.map(|wc| wc.cloned().substitute());
builder.push_clause(impl_where_clauses.chain(assoc_ty_where_clauses));
}
}
pub struct SLGSolver {
pub(crate) forest: Forest<ChalkIr>,
}
impl SLGSolver {
fn new() -> Self {
unimplemented!()
}
fn solve_multiple(&self) {
let _answers = self.forest.iter_answers();
}
}
pub struct ChalkIr;
impl Interner for ChalkIr {
type InternedVariableKinds = Vec<VariableKind<ChalkIr>>;
}
fn main() {
let solver = SLGSolver::new();
solver.solve_multiple();
}
|
