always enable TypingMode::Borrowck

Author: lcnr

compiler/rustc_borrowck/src/lib.rs

@@ -647,12 +647,7 @@ pub(crate) struct BorrowckInferCtxt<'tcx> {
 
 impl<'tcx> BorrowckInferCtxt<'tcx> {
     pub(crate) fn new(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> Self {
-        let typing_mode = if tcx.use_typing_mode_borrowck() {
-            TypingMode::borrowck(tcx, def_id)
-        } else {
-            TypingMode::analysis_in_body(tcx, def_id)
-        };
-        let infcx = tcx.infer_ctxt().build(typing_mode);
+        let infcx = tcx.infer_ctxt().build(TypingMode::borrowck(tcx, def_id));
         let param_env = tcx.param_env(def_id);
         BorrowckInferCtxt { infcx, reg_var_to_origin: RefCell::new(Default::default()), param_env }
     }

compiler/rustc_borrowck/src/region_infer/opaque_types.rs

@@ -212,30 +212,13 @@ pub(crate) fn handle_opaque_type_uses<'tcx>(
                 )
             });
 
-        if !tcx.use_typing_mode_borrowck() {
-            if let ty::Alias(ty::Opaque, alias_ty) = ty.kind()
-                && alias_ty.def_id == opaque_type_key.def_id.to_def_id()
-                && alias_ty.args == opaque_type_key.args
-            {
-                continue 'entry;
-            }
-        }
         root_cx.add_concrete_opaque_type(
             opaque_type_key.def_id,
             OpaqueHiddenType { span: hidden_type.span, ty },
         );
     }
 
     for &(key, hidden_type) in &opaque_types {
-        if !tcx.use_typing_mode_borrowck() {
-            if let ty::Alias(ty::Opaque, alias_ty) = hidden_type.ty.kind()
-                && alias_ty.def_id == key.def_id.to_def_id()
-                && alias_ty.args == key.args
-            {
-                continue;
-            }
-        }
-
         let Some(expected) = root_cx.get_concrete_opaque_type(key.def_id) else {
             let guar =
                 tcx.dcx().span_err(hidden_type.span, "non-defining use in the defining scope");

compiler/rustc_middle/src/ty/context.rs

@@ -3283,11 +3283,6 @@ impl<'tcx> TyCtxt<'tcx> {
         self.sess.opts.unstable_opts.next_solver.coherence
     }
 
-    #[allow(rustc::bad_opt_access)]
-    pub fn use_typing_mode_borrowck(self) -> bool {
-        self.next_trait_solver_globally() || self.sess.opts.unstable_opts.typing_mode_borrowck
-    }
-
     pub fn is_impl_trait_in_trait(self, def_id: DefId) -> bool {
         self.opt_rpitit_info(def_id).is_some()
     }

compiler/rustc_session/src/options.rs

@@ -2559,9 +2559,6 @@ written to standard error output)"),
         "in diagnostics, use heuristics to shorten paths referring to items"),
     tune_cpu: Option<String> = (None, parse_opt_string, [TRACKED],
         "select processor to schedule for (`rustc --print target-cpus` for details)"),
-    #[rustc_lint_opt_deny_field_access("use `TyCtxt::use_typing_mode_borrowck` instead of this field")]
-    typing_mode_borrowck: bool = (false, parse_bool, [TRACKED],
-        "enable `TypingMode::Borrowck`, changing the way opaque types are handled during MIR borrowck"),
     #[rustc_lint_opt_deny_field_access("use `Session::ub_checks` instead of this field")]
     ub_checks: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "emit runtime checks for Undefined Behavior (default: -Cdebug-assertions)"),