Differentiate method/tymethod by determining 'defaultness'

Currently a method only has defaultness if it is a provided trait
method, but this will change when specialisation is available and may
need to become a concept known to hir.

I opted to go for a 'fewest changes' approach given specialisation is
still under development.

2 files changed, 10 insertions, 3 deletions

diff --git a/crates/hir/src/code_model.rs b/crates/hir/src/code_model.rs
index 1dd6d73f3..0b24f247c 100644
--- a/crates/hir/src/code_model.rs
+++ b/crates/hir/src/code_model.rs
@@ -772,7 +772,14 @@ impl Function {
         hir_ty::diagnostics::validate_body(db, self.id.into(), sink)
     }
 
-    pub fn parent_def(self, db: &dyn HirDatabase) -> Option<MethodOwner> {
+    /// Whether this function declaration has a definition.
+    ///
+    /// This is false in the case of required (not provided) trait methods.
+    pub fn has_body(self, db: &dyn HirDatabase) -> bool {
+        db.function_data(self.id).has_body
+    }
+
+    pub fn method_owner(self, db: &dyn HirDatabase) -> Option<MethodOwner> {
         match self.as_assoc_item(db).map(|assoc| assoc.container(db)) {
             Some(AssocItemContainer::Trait(t)) => Some(t.into()),
             Some(AssocItemContainer::ImplDef(imp)) => {
diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index 4094a76cb..687abe6ca 100644
--- a/crates/hir/src/lib.rs
+++ b/crates/hir/src/lib.rs
@@ -35,8 +35,8 @@ pub use crate::{
     code_model::{
         Access, Adt, AsAssocItem, AssocItem, AssocItemContainer, Callable, CallableKind, Const,
         Crate, CrateDependency, DefWithBody, Enum, EnumVariant, Field, FieldSource, Function,
-        GenericDef, HasVisibility, ImplDef, Local, MacroDef, Module, ModuleDef, ScopeDef, Static,
-        Struct, Trait, Type, TypeAlias, TypeParam, Union, VariantDef, Visibility,
+        GenericDef, HasVisibility, ImplDef, Local, MacroDef, MethodOwner, Module, ModuleDef,
+        ScopeDef, Static, Struct, Trait, Type, TypeAlias, TypeParam, Union, VariantDef, Visibility,
     },
     has_source::HasSource,
     semantics::{original_range, PathResolution, Semantics, SemanticsScope},