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
|
use crate::ty::{self, Ty, TyCtxt, AdtSizedConstraint};
use crate::ty::util::NeedsDrop;
use syntax::symbol::Symbol;
pub(super) trait Value<'tcx>: Sized {
fn from_cycle_error<'a>(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> Self;
}
impl<'tcx, T> Value<'tcx> for T {
default fn from_cycle_error<'a>(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> T {
tcx.sess.abort_if_errors();
bug!("Value::from_cycle_error called without errors");
}
}
impl<'tcx, T: Default> Value<'tcx> for T {
default fn from_cycle_error<'a>(_: TyCtxt<'a, 'tcx, 'tcx>) -> T {
T::default()
}
}
impl<'tcx> Value<'tcx> for Ty<'tcx> {
fn from_cycle_error<'a>(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> Ty<'tcx> {
tcx.types.err
}
}
impl<'tcx> Value<'tcx> for ty::SymbolName {
fn from_cycle_error<'a>(_: TyCtxt<'a, 'tcx, 'tcx>) -> Self {
ty::SymbolName { name: Symbol::intern("<error>").as_interned_str() }
}
}
impl<'tcx> Value<'tcx> for NeedsDrop {
fn from_cycle_error(_: TyCtxt<'_, 'tcx, 'tcx>) -> Self {
NeedsDrop(false)
}
}
impl<'tcx> Value<'tcx> for AdtSizedConstraint<'tcx> {
fn from_cycle_error(tcx: TyCtxt<'_, 'tcx, 'tcx>) -> Self {
AdtSizedConstraint(tcx.intern_type_list(&[tcx.types.err]))
}
}
|
