Implement basic inherent method resolution

crates/ra_hir/src/code_model_api.rs

@@ -113,6 +113,11 @@ impl Module {
         self.child_impl(db, name)
     }
 
+    /// Iterates over all child modules.
+    pub fn children(&self, db: &impl HirDatabase) -> Cancelable<impl Iterator<Item = Module>> {
+        self.children_impl(db)
+    }
+
     /// Finds a parent module.
     pub fn parent(&self, db: &impl HirDatabase) -> Cancelable<Option<Module>> {
         self.parent_impl(db)
@@ -270,6 +275,9 @@ pub struct FnSignature {
     pub(crate) name: Name,
     pub(crate) args: Vec<TypeRef>,
     pub(crate) ret_type: TypeRef,
+    /// True if the first arg is `self`. This is relevant to decide whether this
+    /// can be called as a method.
+    pub(crate) has_self_arg: bool,
 }
 
 impl FnSignature {
@@ -284,6 +292,12 @@ impl FnSignature {
     pub fn ret_type(&self) -> &TypeRef {
         &self.ret_type
     }
+
+    /// True if the first arg is `self`. This is relevant to decide whether this
+    /// can be called as a method.
+    pub fn has_self_arg(&self) -> bool {
+        self.has_self_arg
+    }
 }
 
 impl Function {