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rustc: tweak comments on InstanceDef.

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Ana-Maria Mihalache 2020-03-11 15:20:31 +00:00 • committed by Eduard-Mihai Burtescu
parent 51ea260ee7
commit bc8ff3fe8e
1 changed files with 9 additions and 12 deletions
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21
src/librustc/ty/instance.rs
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@ -40,10 +40,9 @@ pub enum InstanceDef<'tcx> {
/// `<fn() as FnTrait>::call_*`
/// `DefId` is `FnTrait::call_*`.
///
/// NB: the (`fn` pointer) type must be monomorphic for MIR shims to work.
// FIXME(eddyb) support generating shims for a "shallow type",
// e.g. `fn(_, _) -> _` instead of requiring a fully monomorphic
// `fn(Foo, Bar) -> Baz` etc.
/// NB: the (`fn` pointer) type must currently be monomorphic to avoid double substitution
/// problems with the MIR shim bodies. `Instance::resolve` enforces this.
// FIXME(#69925) support polymorphic MIR shim bodies properly instead.
FnPtrShim(DefId, Ty<'tcx>),
/// `<dyn Trait as Trait>::fn`, "direct calls" of which are implicitly
@ -63,18 +62,16 @@ pub enum InstanceDef<'tcx> {
/// The `Option<Ty<'tcx>>` is either `Some(T)`, or `None` for empty drop
/// glue.
///
/// NB: the type must be monomorphic for MIR shims to work.
// FIXME(eddyb) support generating shims for a "shallow type",
// e.g. `Foo<_>` or `[_]` instead of requiring a fully monomorphic
// `Foo<Bar>` or `[String]` etc.
/// NB: the type must currently be monomorphic to avoid double substitution
/// problems with the MIR shim bodies. `Instance::resolve` enforces this.
// FIXME(#69925) support polymorphic MIR shim bodies properly instead.
DropGlue(DefId, Option<Ty<'tcx>>),
///`<T as Clone>::clone` shim.
///
/// NB: the type must be monomorphic for MIR shims to work.
// FIXME(eddyb) support generating shims for a "shallow type",
// e.g. `Foo<_>` or `[_]` instead of requiring a fully monomorphic
// `Foo<Bar>` or `[String]` etc.
/// NB: the type must currently be monomorphic to avoid double substitution
/// problems with the MIR shim bodies. `Instance::resolve` enforces this.
// FIXME(#69925) support polymorphic MIR shim bodies properly instead.
CloneShim(DefId, Ty<'tcx>),
}