diff options
Diffstat (limited to 'compiler/rustc_const_eval/src/transform')
4 files changed, 35 insertions, 3 deletions
diff --git a/compiler/rustc_const_eval/src/transform/check_consts/check.rs b/compiler/rustc_const_eval/src/transform/check_consts/check.rs index c26d6012412..8c2346c4efd 100644 --- a/compiler/rustc_const_eval/src/transform/check_consts/check.rs +++ b/compiler/rustc_const_eval/src/transform/check_consts/check.rs @@ -664,6 +664,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> { | ProjectionElem::Downcast(..) | ProjectionElem::OpaqueCast(..) | ProjectionElem::Subslice { .. } + | ProjectionElem::Subtype(..) | ProjectionElem::Field(..) | ProjectionElem::Index(_) => {} } diff --git a/compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs b/compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs index 34e9b76c484..de3186a53c1 100644 --- a/compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs +++ b/compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs @@ -306,6 +306,7 @@ where ProjectionElem::Index(index) if in_local(index) => return true, ProjectionElem::Deref + | ProjectionElem::Subtype(_) | ProjectionElem::Field(_, _) | ProjectionElem::OpaqueCast(_) | ProjectionElem::ConstantIndex { .. } diff --git a/compiler/rustc_const_eval/src/transform/promote_consts.rs b/compiler/rustc_const_eval/src/transform/promote_consts.rs index b1a79a93826..5d8b1956afb 100644 --- a/compiler/rustc_const_eval/src/transform/promote_consts.rs +++ b/compiler/rustc_const_eval/src/transform/promote_consts.rs @@ -357,7 +357,9 @@ impl<'tcx> Validator<'_, 'tcx> { return Err(Unpromotable); } - ProjectionElem::ConstantIndex { .. } | ProjectionElem::Subslice { .. } => {} + ProjectionElem::ConstantIndex { .. } + | ProjectionElem::Subtype(_) + | ProjectionElem::Subslice { .. } => {} ProjectionElem::Index(local) => { let mut promotable = false; diff --git a/compiler/rustc_const_eval/src/transform/validate.rs b/compiler/rustc_const_eval/src/transform/validate.rs index 5289557c01b..ec1bc20ed7a 100644 --- a/compiler/rustc_const_eval/src/transform/validate.rs +++ b/compiler/rustc_const_eval/src/transform/validate.rs @@ -7,7 +7,7 @@ use rustc_infer::traits::Reveal; use rustc_middle::mir::interpret::Scalar; use rustc_middle::mir::visit::{NonUseContext, PlaceContext, Visitor}; use rustc_middle::mir::*; -use rustc_middle::ty::{self, InstanceDef, ParamEnv, Ty, TyCtxt, TypeVisitableExt}; +use rustc_middle::ty::{self, InstanceDef, ParamEnv, Ty, TyCtxt, TypeVisitableExt, Variance}; use rustc_mir_dataflow::impls::MaybeStorageLive; use rustc_mir_dataflow::storage::always_storage_live_locals; use rustc_mir_dataflow::{Analysis, ResultsCursor}; @@ -16,6 +16,8 @@ use rustc_target::spec::abi::Abi; use crate::util::is_within_packed; +use crate::util::relate_types; + #[derive(Copy, Clone, Debug, PartialEq, Eq)] enum EdgeKind { Unwind, @@ -602,7 +604,15 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> { return true; } - crate::util::is_subtype(self.tcx, self.param_env, src, dest) + // After borrowck subtyping should be fully explicit via + // `Subtype` projections. + let variance = if self.mir_phase >= MirPhase::Runtime(RuntimePhase::Initial) { + Variance::Invariant + } else { + Variance::Covariant + }; + + crate::util::relate_types(self.tcx, self.param_env, variance, src, dest) } } @@ -753,6 +763,23 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> { } } } + ProjectionElem::Subtype(ty) => { + if !relate_types( + self.tcx, + self.param_env, + Variance::Covariant, + ty, + place_ref.ty(&self.body.local_decls, self.tcx).ty, + ) { + self.fail( + location, + format!( + "Failed subtyping {ty:#?} and {:#?}", + place_ref.ty(&self.body.local_decls, self.tcx).ty + ), + ) + } + } _ => {} } self.super_projection_elem(place_ref, elem, context, location); @@ -1088,6 +1115,7 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> { // LHS and RHS of the assignment must have the same type. let left_ty = dest.ty(&self.body.local_decls, self.tcx).ty; let right_ty = rvalue.ty(&self.body.local_decls, self.tcx); + if !self.mir_assign_valid_types(right_ty, left_ty) { self.fail( location, |