From a4d7bdf1c884a9f3dd415a882fa56422adae89bf Mon Sep 17 00:00:00 2001
From: Florian Diebold <flodiebold@gmail.com>
Date: Sun, 4 Apr 2021 13:07:06 +0200
Subject: Replace Substitution::bound_vars and ::type_params_for_generics

---
 crates/hir_ty/src/utils.rs | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

(limited to 'crates/hir_ty/src/utils.rs')

diff --git a/crates/hir_ty/src/utils.rs b/crates/hir_ty/src/utils.rs
index 42d7af146..b23e91b1b 100644
--- a/crates/hir_ty/src/utils.rs
+++ b/crates/hir_ty/src/utils.rs
@@ -2,7 +2,7 @@
 //! query, but can't be computed directly from `*Data` (ie, which need a `db`).
 use std::sync::Arc;
 
-use chalk_ir::DebruijnIndex;
+use chalk_ir::{BoundVar, DebruijnIndex};
 use hir_def::{
     adt::VariantData,
     db::DefDatabase,
@@ -16,7 +16,7 @@ use hir_def::{
 };
 use hir_expand::name::{name, Name};
 
-use crate::{db::HirDatabase, TraitRef, TypeWalk, WhereClause};
+use crate::{db::HirDatabase, Interner, Substitution, TraitRef, TyKind, TypeWalk, WhereClause};
 
 fn direct_super_traits(db: &dyn DefDatabase, trait_: TraitId) -> Vec<TraitId> {
     let resolver = trait_.resolver(db);
@@ -249,6 +249,26 @@ impl Generics {
             self.parent_generics.as_ref().and_then(|g| g.find_param(param))
         }
     }
+
+    /// Returns a Substitution that replaces each parameter by a bound variable.
+    pub(crate) fn bound_vars_subst(&self, debruijn: DebruijnIndex) -> Substitution {
+        Substitution::from_iter(
+            &Interner,
+            self.iter()
+                .enumerate()
+                .map(|(idx, _)| TyKind::BoundVar(BoundVar::new(debruijn, idx)).intern(&Interner)),
+        )
+    }
+
+    /// Returns a Substitution that replaces each parameter by itself (i.e. `Ty::Param`).
+    pub(crate) fn type_params_subst(&self, db: &dyn HirDatabase) -> Substitution {
+        Substitution::from_iter(
+            &Interner,
+            self.iter().map(|(id, _)| {
+                TyKind::Placeholder(crate::to_placeholder_idx(db, id)).intern(&Interner)
+            }),
+        )
+    }
 }
 
 fn parent_generic_def(db: &dyn DefDatabase, def: GenericDefId) -> Option<GenericDefId> {
-- 
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