TypingMode :thinking:

13 files changed, 47 insertions, 39 deletions

diff --git a/compiler/rustc_hir_analysis/src/check/check.rs b/compiler/rustc_hir_analysis/src/check/check.rs
index 6d04bdf7e48..f830108a02f 100644
--- a/compiler/rustc_hir_analysis/src/check/check.rs
+++ b/compiler/rustc_hir_analysis/src/check/check.rs
@@ -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};
@@ -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));
     let ocx = ObligationCtxt::new_with_diagnostics(&infcx);
 
     let args = match *origin {
@@ -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));
 
     let ocx = ObligationCtxt::new_with_diagnostics(&infcx);
     for (predicate, cause) in &typeck_results.coroutine_stalled_predicates {
diff --git a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
index 9de96b7ba77..db2c44fd29d 100644
--- a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
+++ b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
@@ -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;
@@ -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
@@ -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.
@@ -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) {
@@ -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();
@@ -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 {
@@ -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,
diff --git a/compiler/rustc_hir_analysis/src/check/compare_impl_item/refine.rs b/compiler/rustc_hir_analysis/src/check/compare_impl_item/refine.rs
index 2d6b9813271..646c104f1f5 100644
--- a/compiler/rustc_hir_analysis/src/check/compare_impl_item/refine.rs
+++ b/compiler/rustc_hir_analysis/src/check/compare_impl_item/refine.rs
@@ -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;
@@ -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:
diff --git a/compiler/rustc_hir_analysis/src/check/dropck.rs b/compiler/rustc_hir_analysis/src/check/dropck.rs
index 97a29b32c01..1c9bbe627fb 100644
--- a/compiler/rustc_hir_analysis/src/check/dropck.rs
+++ b/compiler/rustc_hir_analysis/src/check/dropck.rs
@@ -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};
 
@@ -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());
diff --git a/compiler/rustc_hir_analysis/src/check/entry.rs b/compiler/rustc_hir_analysis/src/check/entry.rs
index 7da2cd93d4e..0beb1f98d56 100644
--- a/compiler/rustc_hir_analysis/src/check/entry.rs
+++ b/compiler/rustc_hir_analysis/src/check/entry.rs
@@ -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};
@@ -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,
diff --git a/compiler/rustc_hir_analysis/src/check/mod.rs b/compiler/rustc_hir_analysis/src/check/mod.rs
index ec5a89ec9d9..e9eea36a0e6 100644
--- a/compiler/rustc_hir_analysis/src/check/mod.rs
+++ b/compiler/rustc_hir_analysis/src/check/mod.rs
@@ -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;
@@ -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());
@@ -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();
diff --git a/compiler/rustc_hir_analysis/src/check/wfcheck.rs b/compiler/rustc_hir_analysis/src/check/wfcheck.rs
index 499e42d31c9..12ed7b89f68 100644
--- a/compiler/rustc_hir_analysis/src/check/wfcheck.rs
+++ b/compiler/rustc_hir_analysis/src/check/wfcheck.rs
@@ -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;
@@ -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 };
@@ -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);
 
diff --git a/compiler/rustc_hir_analysis/src/coherence/builtin.rs b/compiler/rustc_hir_analysis/src/coherence/builtin.rs
index b4f6b5a9dd2..5ff52376837 100644
--- a/compiler/rustc_hir_analysis/src/coherence/builtin.rs
+++ b/compiler/rustc_hir_analysis/src/coherence/builtin.rs
@@ -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::{
@@ -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
@@ -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>,
diff --git a/compiler/rustc_hir_analysis/src/coherence/orphan.rs b/compiler/rustc_hir_analysis/src/coherence/orphan.rs
index 04770469132..8a1a887766c 100644
--- a/compiler/rustc_hir_analysis/src/coherence/orphan.rs
+++ b/compiler/rustc_hir_analysis/src/coherence/orphan.rs
@@ -7,7 +7,7 @@ use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
 use rustc_lint_defs::builtin::UNCOVERED_PARAM_IN_PROJECTION;
 use rustc_middle::ty::{
     self, Ty, TyCtxt, TypeFoldable, TypeFolder, TypeSuperFoldable, TypeSuperVisitable,
-    TypeVisitable, TypeVisitableExt, TypeVisitor,
+    TypeVisitable, TypeVisitableExt, TypeVisitor, TypingMode,
 };
 use rustc_middle::{bug, span_bug};
 use rustc_span::def_id::{DefId, LocalDefId};
@@ -302,7 +302,7 @@ fn orphan_check<'tcx>(
     }
 
     // (1)  Instantiate all generic params with fresh inference vars.
-    let infcx = tcx.infer_ctxt().intercrate(true).build();
+    let infcx = tcx.infer_ctxt().build(TypingMode::Coherence);
     let cause = traits::ObligationCause::dummy();
     let args = infcx.fresh_args_for_item(cause.span, impl_def_id.to_def_id());
     let trait_ref = trait_ref.instantiate(tcx, args);
diff --git a/compiler/rustc_hir_analysis/src/collect.rs b/compiler/rustc_hir_analysis/src/collect.rs
index 3add801cf56..cca52c5142c 100644
--- a/compiler/rustc_hir_analysis/src/collect.rs
+++ b/compiler/rustc_hir_analysis/src/collect.rs
@@ -34,7 +34,7 @@ use rustc_infer::traits::ObligationCause;
 use rustc_middle::hir::nested_filter;
 use rustc_middle::query::Providers;
 use rustc_middle::ty::util::{Discr, IntTypeExt};
-use rustc_middle::ty::{self, AdtKind, Const, IsSuggestable, Ty, TyCtxt};
+use rustc_middle::ty::{self, AdtKind, Const, IsSuggestable, Ty, TyCtxt, TypingMode};
 use rustc_middle::{bug, span_bug};
 use rustc_span::symbol::{Ident, Symbol, kw, sym};
 use rustc_span::{DUMMY_SP, Span};
@@ -1438,9 +1438,11 @@ fn infer_return_ty_for_fn_sig<'tcx>(
                     Applicability::MachineApplicable,
                 );
                 recovered_ret_ty = Some(suggestable_ret_ty);
-            } else if let Some(sugg) =
-                suggest_impl_trait(&tcx.infer_ctxt().build(), tcx.param_env(def_id), ret_ty)
-            {
+            } else if let Some(sugg) = suggest_impl_trait(
+                &tcx.infer_ctxt().build(TypingMode::non_body_analysis()),
+                tcx.param_env(def_id),
+                ret_ty,
+            ) {
                 diag.span_suggestion(
                     ty.span,
                     "replace with an appropriate return type",
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
index 0891642f2c8..2d0c3ec28c3 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
@@ -39,7 +39,7 @@ use rustc_middle::mir::interpret::{LitToConstError, LitToConstInput};
 use rustc_middle::ty::print::PrintPolyTraitRefExt as _;
 use rustc_middle::ty::{
     self, Const, GenericArgKind, GenericArgsRef, GenericParamDefKind, ParamEnv, Ty, TyCtxt,
-    TypeVisitableExt,
+    TypeVisitableExt, TypingMode,
 };
 use rustc_middle::{bug, span_bug};
 use rustc_session::lint::builtin::AMBIGUOUS_ASSOCIATED_ITEMS;
@@ -1300,7 +1300,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             Some(infcx) => infcx,
             None => {
                 assert!(!self_ty.has_infer());
-                infcx_ = tcx.infer_ctxt().ignoring_regions().build();
+                infcx_ = tcx.infer_ctxt().ignoring_regions().build(TypingMode::non_body_analysis());
                 &infcx_
             }
         };
@@ -1492,7 +1492,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             infcx
         } else {
             assert!(!qself_ty.has_infer());
-            infcx_ = tcx.infer_ctxt().build();
+            infcx_ = tcx.infer_ctxt().build(TypingMode::non_body_analysis());
             &infcx_
         };
 
diff --git a/compiler/rustc_hir_analysis/src/hir_wf_check.rs b/compiler/rustc_hir_analysis/src/hir_wf_check.rs
index 2fa4ca68073..5b0165bf993 100644
--- a/compiler/rustc_hir_analysis/src/hir_wf_check.rs
+++ b/compiler/rustc_hir_analysis/src/hir_wf_check.rs
@@ -5,7 +5,7 @@ use rustc_infer::infer::TyCtxtInferExt;
 use rustc_infer::traits::{ObligationCause, WellFormedLoc};
 use rustc_middle::bug;
 use rustc_middle::query::Providers;
-use rustc_middle::ty::{self, TyCtxt};
+use rustc_middle::ty::{self, TyCtxt, TypingMode};
 use rustc_span::def_id::LocalDefId;
 use rustc_trait_selection::traits::{self, ObligationCtxt};
 use tracing::debug;
@@ -68,7 +68,7 @@ fn diagnostic_hir_wf_check<'tcx>(
 
     impl<'tcx> Visitor<'tcx> for HirWfCheck<'tcx> {
         fn visit_ty(&mut self, ty: &'tcx hir::Ty<'tcx>) {
-            let infcx = self.tcx.infer_ctxt().build();
+            let infcx = self.tcx.infer_ctxt().build(TypingMode::non_body_analysis());
             let ocx = ObligationCtxt::new_with_diagnostics(&infcx);
 
             let tcx_ty = self.icx.lower_ty(ty);
diff --git a/compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs b/compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs
index a394fc2fbb1..b0c9aed5d85 100644
--- a/compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs
+++ b/compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs
@@ -72,7 +72,9 @@ use rustc_infer::infer::TyCtxtInferExt;
 use rustc_infer::infer::outlives::env::OutlivesEnvironment;
 use rustc_infer::traits::specialization_graph::Node;
 use rustc_middle::ty::trait_def::TraitSpecializationKind;
-use rustc_middle::ty::{self, GenericArg, GenericArgs, GenericArgsRef, TyCtxt, TypeVisitableExt};
+use rustc_middle::ty::{
+    self, GenericArg, GenericArgs, GenericArgsRef, TyCtxt, TypeVisitableExt, TypingMode,
+};
 use rustc_span::{ErrorGuaranteed, Span};
 use rustc_trait_selection::error_reporting::InferCtxtErrorExt;
 use rustc_trait_selection::traits::outlives_bounds::InferCtxtExt as _;
@@ -195,7 +197,7 @@ fn get_impl_args(
     impl1_def_id: LocalDefId,
     impl2_node: Node,
 ) -> Result<(GenericArgsRef<'_>, GenericArgsRef<'_>), 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 param_env = tcx.param_env(impl1_def_id);
     let impl1_span = tcx.def_span(impl1_def_id);
@@ -409,7 +411,7 @@ fn check_predicates<'tcx>(
 
     // Include the well-formed predicates of the type parameters of the impl.
     for arg in tcx.impl_trait_ref(impl1_def_id).unwrap().instantiate_identity().args {
-        let infcx = &tcx.infer_ctxt().build();
+        let infcx = &tcx.infer_ctxt().build(TypingMode::non_body_analysis());
         let obligations =
             wf::obligations(infcx, tcx.param_env(impl1_def_id), impl1_def_id, 0, arg, span)
                 .unwrap();