Abstract no-partialeq check

Fixes rust-lang#965

Author: alexeyzab

src/ir/analysis/derive_partial_eq.rs

@@ -7,7 +7,6 @@ use ir::comp::FieldMethods;
 use ir::context::{BindgenContext, ItemId};
 use ir::derive::CanTriviallyDerivePartialEq;
 use ir::item::IsOpaque;
-use ir::item::ItemCanonicalName;
 use ir::traversal::EdgeKind;
 use ir::ty::RUST_DERIVE_IN_ARRAY_LIMIT;
 use ir::ty::TypeKind;
@@ -145,8 +144,7 @@ impl<'ctx> MonotoneFramework for CannotDerivePartialEq<'ctx> {
             };
         }
 
-        let name = item.canonical_name(self.ctx);
-        if self.ctx.options().no_partialeq_types.matches(&name) {
+        if self.ctx.no_partialeq_by_name(&item) {
             return self.insert(id)
         }
 

src/ir/context.rs

@@ -10,6 +10,7 @@ use super::derive::{CanDeriveCopy, CanDeriveDebug, CanDeriveDefault,
 use super::int::IntKind;
 use super::item::{HasTypeParamInArray, IsOpaque, Item, ItemAncestors,
                   ItemCanonicalPath, ItemSet};
+use ir::item::ItemCanonicalName;
 use super::item_kind::ItemKind;
 use super::module::{Module, ModuleKind};
 use super::template::{TemplateInstantiation, TemplateParameters};
@@ -2198,6 +2199,12 @@ impl BindgenContext {
         // float or not.
         self.has_float.as_ref().unwrap().contains(id)
     }
+
+    /// Check if `--no-partialeq` flag is enabled for this item.
+    pub fn no_partialeq_by_name(&self, item: &Item) -> bool {
+        let name = item.canonical_name(self);
+        self.options().no_partialeq_types.matches(&name)
+    }
 }
 
 /// A builder struct for configuring item resolution options.