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TypingMode: merge intercrate, reveal, and defining_opaque_types #131856

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merged 4 commits into from
Oct 30, 2024
Merged

TypingMode: merge intercrate, reveal, and defining_opaque_types #131856

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f51ec11
TypingMode :thinking:
lcnr Oct 17, 2024
ce22ccb
remove outdated debug_assertion
lcnr Oct 24, 2024
4f3a73a
update tools
lcnr Oct 24, 2024
524a22e
rebase
lcnr Oct 29, 2024
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4 changes: 2 additions & 2 deletions compiler/rustc_borrowck/src/lib.rs
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Expand Up @@ -34,7 +34,7 @@ use rustc_infer::infer::{
use rustc_middle::mir::tcx::PlaceTy;
use rustc_middle::mir::*;
use rustc_middle::query::Providers;
use rustc_middle::ty::{self, ParamEnv, RegionVid, TyCtxt};
use rustc_middle::ty::{self, ParamEnv, RegionVid, TyCtxt, TypingMode};
use rustc_middle::{bug, span_bug};
use rustc_mir_dataflow::Analysis;
use rustc_mir_dataflow::impls::{
Expand Down Expand Up @@ -440,7 +440,7 @@ pub struct BorrowckInferCtxt<'tcx> {

impl<'tcx> BorrowckInferCtxt<'tcx> {
pub(crate) fn new(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> Self {
let infcx = tcx.infer_ctxt().with_opaque_type_inference(def_id).build();
let infcx = tcx.infer_ctxt().build(TypingMode::analysis_in_body(tcx, def_id));
BorrowckInferCtxt { infcx, reg_var_to_origin: RefCell::new(Default::default()) }
}

Expand Down
14 changes: 8 additions & 6 deletions compiler/rustc_borrowck/src/region_infer/opaque_types.rs
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Expand Up @@ -9,6 +9,7 @@ use rustc_macros::extension;
use rustc_middle::ty::visit::TypeVisitableExt;
use rustc_middle::ty::{
self, GenericArgKind, GenericArgs, OpaqueHiddenType, OpaqueTypeKey, Ty, TyCtxt, TypeFoldable,
TypingMode,
};
use rustc_span::Span;
use rustc_trait_selection::error_reporting::InferCtxtErrorExt;
Expand Down Expand Up @@ -340,14 +341,13 @@ fn check_opaque_type_well_formed<'tcx>(
parent_def_id = tcx.local_parent(parent_def_id);
}

// FIXME(-Znext-solver): We probably should use `&[]` instead of
// and prepopulate this `InferCtxt` with known opaque values, rather than
// allowing opaque types to be defined and checking them after the fact.
// FIXME(#132279): This should eventually use the already defined hidden types
// instead. Alternatively we'll entirely remove this function given we also check
// the opaque in `check_opaque_meets_bounds` later.
let infcx = tcx
.infer_ctxt()
.with_next_trait_solver(next_trait_solver)
.with_opaque_type_inference(parent_def_id)
.build();
.build(TypingMode::analysis_in_body(tcx, parent_def_id));
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let ocx = ObligationCtxt::new_with_diagnostics(&infcx);
let identity_args = GenericArgs::identity_for_item(tcx, def_id);

Expand Down Expand Up @@ -517,7 +517,9 @@ impl<'tcx> LazyOpaqueTyEnv<'tcx> {
},
);

let infcx = tcx.infer_ctxt().build();
// FIXME(#132279): It feels wrong to use `non_body_analysis` here given that we're
// in a body here.
let infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let ocx = ObligationCtxt::new(&infcx);

let wf_tys = ocx.assumed_wf_types(param_env, parent).unwrap_or_else(|_| {
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_codegen_ssa/src/base.rs
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Expand Up @@ -21,7 +21,7 @@ use rustc_middle::mir::BinOp;
use rustc_middle::mir::mono::{CodegenUnit, CodegenUnitNameBuilder, MonoItem};
use rustc_middle::query::Providers;
use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf, TyAndLayout};
use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
use rustc_middle::ty::{self, Instance, Ty, TyCtxt, TypingMode};
use rustc_session::Session;
use rustc_session::config::{self, CrateType, EntryFnType, OptLevel, OutputType};
use rustc_span::symbol::sym;
Expand Down Expand Up @@ -119,7 +119,7 @@ pub fn validate_trivial_unsize<'tcx>(
) -> bool {
match (source_data.principal(), target_data.principal()) {
(Some(hr_source_principal), Some(hr_target_principal)) => {
let infcx = tcx.infer_ctxt().build();
let infcx = tcx.infer_ctxt().build(TypingMode::PostAnalysis);
let universe = infcx.universe();
let ocx = ObligationCtxt::new(&infcx);
infcx.enter_forall(hr_target_principal, |target_principal| {
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_const_eval/src/check_consts/check.rs
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Expand Up @@ -16,7 +16,7 @@ use rustc_middle::mir::visit::Visitor;
use rustc_middle::mir::*;
use rustc_middle::span_bug;
use rustc_middle::ty::adjustment::PointerCoercion;
use rustc_middle::ty::{self, Instance, InstanceKind, Ty, TypeVisitableExt};
use rustc_middle::ty::{self, Instance, InstanceKind, Ty, TypeVisitableExt, TypingMode};
use rustc_mir_dataflow::Analysis;
use rustc_mir_dataflow::impls::MaybeStorageLive;
use rustc_mir_dataflow::storage::always_storage_live_locals;
Expand Down Expand Up @@ -593,7 +593,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
// Typeck only does a "non-const" check since it operates on HIR and cannot distinguish
// which path expressions are getting called on and which path expressions are only used
// as function pointers. This is required for correctness.
let infcx = tcx.infer_ctxt().build();
let infcx = tcx.infer_ctxt().build(TypingMode::from_param_env(param_env));
let ocx = ObligationCtxt::new_with_diagnostics(&infcx);

let predicates = tcx.predicates_of(callee).instantiate(tcx, fn_args);
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_const_eval/src/check_consts/ops.rs
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Expand Up @@ -12,7 +12,7 @@ use rustc_middle::mir::CallSource;
use rustc_middle::span_bug;
use rustc_middle::ty::print::{PrintTraitRefExt as _, with_no_trimmed_paths};
use rustc_middle::ty::{
self, Closure, FnDef, FnPtr, GenericArgKind, GenericArgsRef, Param, TraitRef, Ty,
self, Closure, FnDef, FnPtr, GenericArgKind, GenericArgsRef, Param, TraitRef, Ty, TypingMode,
suggest_constraining_type_param,
};
use rustc_middle::util::{CallDesugaringKind, CallKind, call_kind};
Expand Down Expand Up @@ -116,7 +116,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
let obligation =
Obligation::new(tcx, ObligationCause::dummy(), param_env, trait_ref);

let infcx = tcx.infer_ctxt().build();
let infcx = tcx.infer_ctxt().build(TypingMode::from_param_env(param_env));
let mut selcx = SelectionContext::new(&infcx);
let implsrc = selcx.select(&obligation);

Expand Down
10 changes: 5 additions & 5 deletions compiler/rustc_const_eval/src/check_consts/qualifs.rs
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Expand Up @@ -114,11 +114,11 @@ impl Qualif for HasMutInterior {
ty::TraitRef::new(cx.tcx, freeze_def_id, [ty::GenericArg::from(ty)]),
);

let infcx = cx
.tcx
.infer_ctxt()
.with_opaque_type_inference(cx.body.source.def_id().expect_local())
.build();
// FIXME(#132279): This should eventually use the already defined hidden types.
let infcx = cx.tcx.infer_ctxt().build(ty::TypingMode::analysis_in_body(
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cx.tcx,
cx.body.source.def_id().expect_local(),
));
let ocx = ObligationCtxt::new(&infcx);
ocx.register_obligation(obligation);
let errors = ocx.select_all_or_error();
Expand Down
6 changes: 4 additions & 2 deletions compiler/rustc_const_eval/src/interpret/eval_context.rs
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Expand Up @@ -9,7 +9,9 @@ use rustc_middle::query::TyCtxtAt;
use rustc_middle::ty::layout::{
self, FnAbiError, FnAbiOfHelpers, FnAbiRequest, LayoutError, LayoutOfHelpers, TyAndLayout,
};
use rustc_middle::ty::{self, GenericArgsRef, ParamEnv, Ty, TyCtxt, TypeFoldable, Variance};
use rustc_middle::ty::{
self, GenericArgsRef, ParamEnv, Ty, TyCtxt, TypeFoldable, TypingMode, Variance,
};
use rustc_middle::{mir, span_bug};
use rustc_session::Limit;
use rustc_span::Span;
Expand Down Expand Up @@ -325,7 +327,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
return true;
}
// Slow path: spin up an inference context to check if these traits are sufficiently equal.
let infcx = self.tcx.infer_ctxt().build();
let infcx = self.tcx.infer_ctxt().build(TypingMode::from_param_env(self.param_env));
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FIXME for: this could use a typing mode based off of the body of the root we're evaluating, idk if we have that info.

?? I guess that's morally equivalent to deriving it from the param-env tho.

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extended the comment for from_param_env

    /// FIXME(#132279): Using this function is questionable as the `param_env`
    /// does not track `defining_opaque_types` and whether we're in coherence mode.
    /// Many uses of this function should also use a not-yet implemented typing mode
    /// which reveals already defined opaque types in the future. This function will
    /// get completely removed at some point.

yeah, this should use the TypingMode::reveal_opaques_from_body or something once it exists.

let ocx = ObligationCtxt::new(&infcx);
let cause = ObligationCause::dummy_with_span(self.cur_span());
// equate the two trait refs after normalization
Expand Down
5 changes: 3 additions & 2 deletions compiler/rustc_const_eval/src/util/compare_types.rs
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Expand Up @@ -5,7 +5,7 @@

use rustc_infer::infer::TyCtxtInferExt;
use rustc_middle::traits::ObligationCause;
use rustc_middle::ty::{ParamEnv, Ty, TyCtxt, Variance};
use rustc_middle::ty::{ParamEnv, Ty, TyCtxt, TypingMode, Variance};
use rustc_trait_selection::traits::ObligationCtxt;

/// Returns whether the two types are equal up to subtyping.
Expand Down Expand Up @@ -45,7 +45,8 @@ pub fn relate_types<'tcx>(
}

let mut builder = tcx.infer_ctxt().ignoring_regions();
let infcx = builder.build();
// FIXME(#132279): This should eventually use the already defined hidden types.
let infcx = builder.build(TypingMode::from_param_env(param_env));
let ocx = ObligationCtxt::new(&infcx);
let cause = ObligationCause::dummy();
let src = ocx.normalize(&cause, param_env, src);
Expand Down
8 changes: 5 additions & 3 deletions compiler/rustc_hir_analysis/src/check/check.rs
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Expand Up @@ -30,6 +30,7 @@ use rustc_trait_selection::traits;
use rustc_trait_selection::traits::outlives_bounds::InferCtxtExt as _;
use rustc_type_ir::fold::TypeFoldable;
use tracing::{debug, instrument};
use ty::TypingMode;
use {rustc_attr as attr, rustc_hir as hir};

use super::compare_impl_item::{check_type_bounds, compare_impl_method, compare_impl_ty};
Expand Down Expand Up @@ -276,7 +277,8 @@ fn check_opaque_meets_bounds<'tcx>(
};
let param_env = tcx.param_env(defining_use_anchor);

let infcx = tcx.infer_ctxt().with_opaque_type_inference(defining_use_anchor).build();
// FIXME(#132279): This should eventually use the already defined hidden types.
let infcx = tcx.infer_ctxt().build(TypingMode::analysis_in_body(tcx, defining_use_anchor));
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let ocx = ObligationCtxt::new_with_diagnostics(&infcx);

let args = match *origin {
Expand Down Expand Up @@ -1675,8 +1677,8 @@ pub(super) fn check_coroutine_obligations(
// typeck writeback gives us predicates with their regions erased.
// As borrowck already has checked lifetimes, we do not need to do it again.
.ignoring_regions()
.with_opaque_type_inference(def_id)
.build();
// FIXME(#132279): This should eventually use the already defined hidden types.
.build(TypingMode::analysis_in_body(tcx, def_id));
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let ocx = ObligationCtxt::new_with_diagnostics(&infcx);
for (predicate, cause) in &typeck_results.coroutine_stalled_predicates {
Expand Down
14 changes: 7 additions & 7 deletions compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
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Expand Up @@ -17,7 +17,7 @@ use rustc_middle::ty::fold::BottomUpFolder;
use rustc_middle::ty::util::ExplicitSelf;
use rustc_middle::ty::{
self, GenericArgs, GenericParamDefKind, Ty, TyCtxt, TypeFoldable, TypeFolder,
TypeSuperFoldable, TypeVisitableExt, Upcast,
TypeSuperFoldable, TypeVisitableExt, TypingMode, Upcast,
};
use rustc_middle::{bug, span_bug};
use rustc_span::Span;
Expand Down Expand Up @@ -228,7 +228,7 @@ fn compare_method_predicate_entailment<'tcx>(
let param_env = traits::normalize_param_env_or_error(tcx, param_env, normalize_cause);
debug!(caller_bounds=?param_env.caller_bounds());

let infcx = &tcx.infer_ctxt().build();
let infcx = &tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let ocx = ObligationCtxt::new_with_diagnostics(infcx);

// Create obligations for each predicate declared by the impl
Expand Down Expand Up @@ -516,7 +516,7 @@ pub(super) fn collect_return_position_impl_trait_in_trait_tys<'tcx>(
ObligationCause::misc(tcx.def_span(impl_m_def_id), impl_m_def_id),
);

let infcx = &tcx.infer_ctxt().build();
let infcx = &tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let ocx = ObligationCtxt::new_with_diagnostics(infcx);

// Normalize the impl signature with fresh variables for lifetime inference.
Expand Down Expand Up @@ -1196,7 +1196,7 @@ fn compare_self_type<'tcx>(
let self_arg_ty = tcx.fn_sig(method.def_id).instantiate_identity().input(0);
let param_env = ty::ParamEnv::reveal_all();

let infcx = tcx.infer_ctxt().build();
let infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let self_arg_ty = tcx.liberate_late_bound_regions(method.def_id, self_arg_ty);
let can_eq_self = |ty| infcx.can_eq(param_env, untransformed_self_ty, ty);
match ExplicitSelf::determine(self_arg_ty, can_eq_self) {
Expand Down Expand Up @@ -1801,7 +1801,7 @@ fn compare_const_predicate_entailment<'tcx>(
ObligationCause::misc(impl_ct_span, impl_ct_def_id),
);

let infcx = tcx.infer_ctxt().build();
let infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let ocx = ObligationCtxt::new_with_diagnostics(&infcx);

let impl_ct_own_bounds = impl_ct_predicates.instantiate_own_identity();
Expand Down Expand Up @@ -1951,7 +1951,7 @@ fn compare_type_predicate_entailment<'tcx>(
let param_env = traits::normalize_param_env_or_error(tcx, param_env, normalize_cause);
debug!(caller_bounds=?param_env.caller_bounds());

let infcx = tcx.infer_ctxt().build();
let infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let ocx = ObligationCtxt::new_with_diagnostics(&infcx);

for (predicate, span) in impl_ty_own_bounds {
Expand Down Expand Up @@ -2036,7 +2036,7 @@ pub(super) fn check_type_bounds<'tcx>(
let impl_ty_args = GenericArgs::identity_for_item(tcx, impl_ty.def_id);
let rebased_args = impl_ty_args.rebase_onto(tcx, container_id, impl_trait_ref.args);

let infcx = tcx.infer_ctxt().build();
let infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let ocx = ObligationCtxt::new_with_diagnostics(&infcx);

// A synthetic impl Trait for RPITIT desugaring or assoc type for effects desugaring has no HIR,
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_hir_analysis/src/check/compare_impl_item/refine.rs
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Expand Up @@ -8,7 +8,7 @@ use rustc_middle::span_bug;
use rustc_middle::traits::{ObligationCause, Reveal};
use rustc_middle::ty::{
self, Ty, TyCtxt, TypeFoldable, TypeFolder, TypeSuperVisitable, TypeVisitable,
TypeVisitableExt, TypeVisitor,
TypeVisitableExt, TypeVisitor, TypingMode,
};
use rustc_span::Span;
use rustc_trait_selection::regions::InferCtxtRegionExt;
Expand Down Expand Up @@ -132,7 +132,7 @@ pub(super) fn check_refining_return_position_impl_trait_in_trait<'tcx>(
let param_env = ty::ParamEnv::new(tcx.mk_clauses_from_iter(hybrid_preds), Reveal::UserFacing);
let param_env = normalize_param_env_or_error(tcx, param_env, ObligationCause::dummy());

let ref infcx = tcx.infer_ctxt().build();
let ref infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let ocx = ObligationCtxt::new(infcx);

// Normalize the bounds. This has two purposes:
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_hir_analysis/src/check/dropck.rs
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Expand Up @@ -9,7 +9,7 @@ use rustc_infer::infer::outlives::env::OutlivesEnvironment;
use rustc_infer::infer::{RegionResolutionError, TyCtxtInferExt};
use rustc_infer::traits::{ObligationCause, ObligationCauseCode};
use rustc_middle::ty::util::CheckRegions;
use rustc_middle::ty::{self, GenericArgsRef, Ty, TyCtxt};
use rustc_middle::ty::{self, GenericArgsRef, Ty, TyCtxt, TypingMode};
use rustc_trait_selection::regions::InferCtxtRegionExt;
use rustc_trait_selection::traits::{self, ObligationCtxt};

Expand Down Expand Up @@ -124,7 +124,7 @@ fn ensure_drop_predicates_are_implied_by_item_defn<'tcx>(
adt_def_id: LocalDefId,
adt_to_impl_args: GenericArgsRef<'tcx>,
) -> Result<(), ErrorGuaranteed> {
let infcx = tcx.infer_ctxt().build();
let infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let ocx = ObligationCtxt::new_with_diagnostics(&infcx);

let impl_span = tcx.def_span(drop_impl_def_id.to_def_id());
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_hir_analysis/src/check/entry.rs
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Expand Up @@ -4,7 +4,7 @@ use rustc_hir as hir;
use rustc_hir::Node;
use rustc_infer::infer::TyCtxtInferExt;
use rustc_middle::span_bug;
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_middle::ty::{self, Ty, TyCtxt, TypingMode};
use rustc_session::config::EntryFnType;
use rustc_span::Span;
use rustc_span::def_id::{CRATE_DEF_ID, DefId, LocalDefId};
Expand Down Expand Up @@ -128,7 +128,7 @@ fn check_main_fn_ty(tcx: TyCtxt<'_>, main_def_id: DefId) {
tcx.dcx().emit_err(errors::MainFunctionReturnTypeGeneric { span: return_ty_span });
return;
};
let infcx = tcx.infer_ctxt().build();
let infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let cause = traits::ObligationCause::new(
return_ty_span,
main_diagnostics_def_id,
Expand Down
6 changes: 3 additions & 3 deletions compiler/rustc_hir_analysis/src/check/mod.rs
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Expand Up @@ -85,7 +85,7 @@ use rustc_infer::infer::{self, TyCtxtInferExt as _};
use rustc_infer::traits::ObligationCause;
use rustc_middle::query::Providers;
use rustc_middle::ty::error::{ExpectedFound, TypeError};
use rustc_middle::ty::{self, GenericArgs, GenericArgsRef, Ty, TyCtxt};
use rustc_middle::ty::{self, GenericArgs, GenericArgsRef, Ty, TyCtxt, TypingMode};
use rustc_middle::{bug, span_bug};
use rustc_session::parse::feature_err;
use rustc_span::def_id::CRATE_DEF_ID;
Expand Down Expand Up @@ -530,7 +530,7 @@ fn suggestion_signature<'tcx>(
let ty = tcx.type_of(assoc.def_id).instantiate_identity();
let val = tcx
.infer_ctxt()
.build()
.build(TypingMode::non_body_analysis())
.err_ctxt()
.ty_kind_suggestion(tcx.param_env(assoc.def_id), ty)
.unwrap_or_else(|| "value".to_string());
Expand Down Expand Up @@ -620,7 +620,7 @@ pub fn check_function_signature<'tcx>(

let param_env = ty::ParamEnv::empty();

let infcx = &tcx.infer_ctxt().build();
let infcx = &tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let ocx = ObligationCtxt::new_with_diagnostics(infcx);

let actual_sig = tcx.fn_sig(fn_id).instantiate_identity();
Expand Down
6 changes: 3 additions & 3 deletions compiler/rustc_hir_analysis/src/check/wfcheck.rs
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Expand Up @@ -17,7 +17,7 @@ use rustc_middle::ty::print::with_no_trimmed_paths;
use rustc_middle::ty::trait_def::TraitSpecializationKind;
use rustc_middle::ty::{
self, AdtKind, GenericArgKind, GenericArgs, GenericParamDefKind, Ty, TyCtxt, TypeFoldable,
TypeSuperVisitable, TypeVisitable, TypeVisitableExt, TypeVisitor, Upcast,
TypeSuperVisitable, TypeVisitable, TypeVisitableExt, TypeVisitor, TypingMode, Upcast,
};
use rustc_middle::{bug, span_bug};
use rustc_session::parse::feature_err;
Expand Down Expand Up @@ -106,7 +106,7 @@ where
F: for<'a> FnOnce(&WfCheckingCtxt<'a, 'tcx>) -> Result<(), ErrorGuaranteed>,
{
let param_env = tcx.param_env(body_def_id);
let infcx = &tcx.infer_ctxt().build();
let infcx = &tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let ocx = ObligationCtxt::new_with_diagnostics(infcx);

let mut wfcx = WfCheckingCtxt { ocx, span, body_def_id, param_env };
Expand Down Expand Up @@ -765,7 +765,7 @@ fn test_region_obligations<'tcx>(
// Unfortunately, we have to use a new `InferCtxt` each call, because
// region constraints get added and solved there and we need to test each
// call individually.
let infcx = tcx.infer_ctxt().build();
let infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis());

add_constraints(&infcx);

Expand Down
8 changes: 5 additions & 3 deletions compiler/rustc_hir_analysis/src/coherence/builtin.rs
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Expand Up @@ -15,7 +15,9 @@ use rustc_infer::infer::{self, RegionResolutionError, TyCtxtInferExt};
use rustc_infer::traits::Obligation;
use rustc_middle::ty::adjustment::CoerceUnsizedInfo;
use rustc_middle::ty::print::PrintTraitRefExt as _;
use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt, suggest_constraining_type_params};
use rustc_middle::ty::{
self, Ty, TyCtxt, TypeVisitableExt, TypingMode, suggest_constraining_type_params,
};
use rustc_span::{DUMMY_SP, Span};
use rustc_trait_selection::error_reporting::InferCtxtErrorExt;
use rustc_trait_selection::traits::misc::{
Expand Down Expand Up @@ -213,7 +215,7 @@ fn visit_implementation_of_dispatch_from_dyn(checker: &Checker<'_>) -> Result<()

let param_env = tcx.param_env(impl_did);

let infcx = tcx.infer_ctxt().build();
let infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let cause = ObligationCause::misc(span, impl_did);

// Later parts of the compiler rely on all DispatchFromDyn types to be ABI-compatible with raw
Expand Down Expand Up @@ -354,7 +356,7 @@ pub(crate) fn coerce_unsized_info<'tcx>(

debug!("visit_implementation_of_coerce_unsized: {:?} -> {:?} (free)", source, target);

let infcx = tcx.infer_ctxt().build();
let infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis());
let cause = ObligationCause::misc(span, impl_did);
let check_mutbl = |mt_a: ty::TypeAndMut<'tcx>,
mt_b: ty::TypeAndMut<'tcx>,
Expand Down
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