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.

3 files changed, 6 insertions, 0 deletions

diff --git a/crates/hir_def/src/data.rs b/crates/hir_def/src/data.rs
index 6190906da..ff1ef0df6 100644
--- a/crates/hir_def/src/data.rs
+++ b/crates/hir_def/src/data.rs
@@ -25,6 +25,7 @@ pub struct FunctionData {
     /// True if the first param is `self`. This is relevant to decide whether this
     /// can be called as a method.
     pub has_self_param: bool,
+    pub has_body: bool,
     pub is_unsafe: bool,
     pub is_varargs: bool,
     pub visibility: RawVisibility,
@@ -42,6 +43,7 @@ impl FunctionData {
             ret_type: func.ret_type.clone(),
             attrs: item_tree.attrs(ModItem::from(loc.id.value).into()).clone(),
             has_self_param: func.has_self_param,
+            has_body: func.has_body,
             is_unsafe: func.is_unsafe,
             is_varargs: func.is_varargs,
             visibility: item_tree[func.visibility].clone(),
diff --git a/crates/hir_def/src/item_tree.rs b/crates/hir_def/src/item_tree.rs
index 0fd91b9d0..8a1121bbd 100644
--- a/crates/hir_def/src/item_tree.rs
+++ b/crates/hir_def/src/item_tree.rs
@@ -505,6 +505,7 @@ pub struct Function {
     pub visibility: RawVisibilityId,
     pub generic_params: GenericParamsId,
     pub has_self_param: bool,
+    pub has_body: bool,
     pub is_unsafe: bool,
     pub params: Box<[TypeRef]>,
     pub is_varargs: bool,
diff --git a/crates/hir_def/src/item_tree/lower.rs b/crates/hir_def/src/item_tree/lower.rs
index 54814f141..3328639cf 100644
--- a/crates/hir_def/src/item_tree/lower.rs
+++ b/crates/hir_def/src/item_tree/lower.rs
@@ -330,12 +330,15 @@ impl Ctx {
             ret_type
         };
 
+        let has_body = func.body().is_some();
+
         let ast_id = self.source_ast_id_map.ast_id(func);
         let mut res = Function {
             name,
             visibility,
             generic_params: GenericParamsId::EMPTY,
             has_self_param,
+            has_body,
             is_unsafe: func.unsafe_token().is_some(),
             params: params.into_boxed_slice(),
             is_varargs,