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use ty::{self, Ty, TyCtxt};
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() }
}
}
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