[beta] rustdoc: disable blanket impl collection

Author: QuietMisdreavus

src/librustdoc/clean/auto_trait.rs

@@ -9,15 +9,11 @@
 // except according to those terms.
 
 use rustc::hir;
-use rustc::traits::{self, auto_trait as auto};
-use rustc::ty::{self, ToPredicate, TypeFoldable};
-use rustc::ty::subst::Subst;
-use rustc::infer::InferOk;
+use rustc::traits::auto_trait as auto;
+use rustc::ty::{self, TypeFoldable};
 use std::fmt::Debug;
 use syntax_pos::DUMMY_SP;
 
-use core::DocAccessLevels;
-
 use super::*;
 
 pub struct AutoTraitFinder<'a, 'tcx: 'a, 'rcx: 'a> {
@@ -111,110 +107,6 @@ impl<'a, 'tcx, 'rcx> AutoTraitFinder<'a, 'tcx, 'rcx> {
         }
     }
 
-    pub fn get_blanket_impls<F>(
-        &self,
-        def_id: DefId,
-        def_ctor: &F,
-        name: Option<String>,
-        generics: &ty::Generics,
-    ) -> Vec<Item>
-    where F: Fn(DefId) -> Def {
-        let ty = self.cx.tcx.type_of(def_id);
-        let mut traits = Vec::new();
-        if self.cx.access_levels.borrow().is_doc_reachable(def_id) {
-            let real_name = name.clone().map(|name| Ident::from_str(&name));
-            let param_env = self.cx.tcx.param_env(def_id);
-            for &trait_def_id in self.cx.all_traits.iter() {
-                if !self.cx.access_levels.borrow().is_doc_reachable(trait_def_id) ||
-                   self.cx.generated_synthetics
-                          .borrow_mut()
-                          .get(&(def_id, trait_def_id))
-                          .is_some() {
-                    continue
-                }
-                self.cx.tcx.for_each_relevant_impl(trait_def_id, ty, |impl_def_id| {
-                    self.cx.tcx.infer_ctxt().enter(|infcx| {
-                        let t_generics = infcx.tcx.generics_of(impl_def_id);
-                        let trait_ref = infcx.tcx.impl_trait_ref(impl_def_id).unwrap();
-
-                        match infcx.tcx.type_of(impl_def_id).sty {
-                            ::rustc::ty::TypeVariants::TyParam(_) => {},
-                            _ => return,
-                        }
-
-                        let substs = infcx.fresh_substs_for_item(DUMMY_SP, def_id);
-                        let ty = ty.subst(infcx.tcx, substs);
-                        let param_env = param_env.subst(infcx.tcx, substs);
-
-                        let impl_substs = infcx.fresh_substs_for_item(DUMMY_SP, impl_def_id);
-                        let trait_ref = trait_ref.subst(infcx.tcx, impl_substs);
-
-                        // Require the type the impl is implemented on to match
-                        // our type, and ignore the impl if there was a mismatch.
-                        let cause = traits::ObligationCause::dummy();
-                        let eq_result = infcx.at(&cause, param_env)
-                                             .eq(trait_ref.self_ty(), ty);
-                        if let Ok(InferOk { value: (), obligations }) = eq_result {
-                            // FIXME(eddyb) ignoring `obligations` might cause false positives.
-                            drop(obligations);
-
-                            let may_apply = infcx.predicate_may_hold(&traits::Obligation::new(
-                                cause.clone(),
-                                param_env,
-                                trait_ref.to_predicate(),
-                            ));
-                            if !may_apply {
-                                return
-                            }
-                            self.cx.generated_synthetics.borrow_mut()
-                                                        .insert((def_id, trait_def_id));
-                            let trait_ = hir::TraitRef {
-                                path: get_path_for_type(infcx.tcx,
-                                                        trait_def_id,
-                                                        hir::def::Def::Trait),
-                                ref_id: ast::DUMMY_NODE_ID,
-                            };
-                            let provided_trait_methods =
-                                infcx.tcx.provided_trait_methods(trait_def_id)
-                                         .into_iter()
-                                         .map(|meth| meth.ident.to_string())
-                                         .collect();
-
-                            let ty = self.get_real_ty(def_id, def_ctor, &real_name, generics);
-                            let predicates = infcx.tcx.predicates_of(impl_def_id);
-
-                            traits.push(Item {
-                                source: infcx.tcx.def_span(impl_def_id).clean(self.cx),
-                                name: None,
-                                attrs: Default::default(),
-                                visibility: None,
-                                def_id: self.next_def_id(impl_def_id.krate),
-                                stability: None,
-                                deprecation: None,
-                                inner: ImplItem(Impl {
-                                    unsafety: hir::Unsafety::Normal,
-                                    generics: (t_generics, &predicates).clean(self.cx),
-                                    provided_trait_methods,
-                                    trait_: Some(trait_.clean(self.cx)),
-                                    for_: ty.clean(self.cx),
-                                    items: infcx.tcx.associated_items(impl_def_id)
-                                                    .collect::<Vec<_>>()
-                                                    .clean(self.cx),
-                                    polarity: None,
-                                    synthetic: false,
-                                    blanket_impl: Some(infcx.tcx.type_of(impl_def_id)
-                                                                .clean(self.cx)),
-                                }),
-                            });
-                            debug!("{:?} => {}", trait_ref, may_apply);
-                        }
-                    });
-                });
-            }
-        }
-        traits
-    }
-
     pub fn get_auto_trait_impls<F>(
         &self,
         def_id: DefId,
@@ -262,7 +154,6 @@ impl<'a, 'tcx, 'rcx> AutoTraitFinder<'a, 'tcx, 'rcx> {
                 def_ctor,
                 tcx.require_lang_item(lang_items::SyncTraitLangItem),
             ).into_iter())
-            .chain(self.get_blanket_impls(def_id, def_ctor, name, &generics).into_iter())
             .collect();
 
         debug!(