From 12bf008ab12f87b2e6d4805681f5a389d9e2f425 Mon Sep 17 00:00:00 2001
From: Fedor Sakharov <fedor.sakharov@gmail.com>
Date: Thu, 14 May 2020 13:47:36 +0300
Subject: Adds a param_idx helper

---
 crates/ra_hir/src/code_model.rs | 4 ++--
 crates/ra_hir_ty/src/lib.rs     | 5 +++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/crates/ra_hir/src/code_model.rs b/crates/ra_hir/src/code_model.rs
index 3936f5aaa..cdbf475b3 100644
--- a/crates/ra_hir/src/code_model.rs
+++ b/crates/ra_hir/src/code_model.rs
@@ -992,8 +992,8 @@ impl TypeParam {
 
     pub fn default(self, db: &dyn HirDatabase) -> Option<Ty> {
         let params = db.generic_defaults(self.id.parent);
-        let local_idx: u32 = self.id.local_id.into_raw().into();
-        params.get(local_idx as usize).map(|d| d.clone())
+        let local_idx = hir_ty::param_idx(db, self.id)?;
+        params.get(local_idx).map(|d| d.clone())
     }
 }
 
diff --git a/crates/ra_hir_ty/src/lib.rs b/crates/ra_hir_ty/src/lib.rs
index e8f3482fe..ccc4348f4 100644
--- a/crates/ra_hir_ty/src/lib.rs
+++ b/crates/ra_hir_ty/src/lib.rs
@@ -427,6 +427,11 @@ impl Substs {
     }
 }
 
+/// Return an index of a parameter in the generic type parameter list by it's id.
+pub fn param_idx(db: &dyn HirDatabase, id: TypeParamId) -> Option<usize> {
+    generics(db.upcast(), id.parent).param_idx(id)
+}
+
 #[derive(Debug, Clone)]
 pub struct SubstsBuilder {
     vec: Vec<Ty>,
-- 
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