From dc0b5817366f9b7b99a1a1f6e69ca7ac63e9ed0f Mon Sep 17 00:00:00 2001
From: Florian Diebold <flodiebold@gmail.com>
Date: Wed, 7 Apr 2021 21:17:51 +0200
Subject: Fix subst_prefix

---
 crates/hir_ty/src/lib.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/crates/hir_ty/src/lib.rs b/crates/hir_ty/src/lib.rs
index 0954d495c..78ae3545a 100644
--- a/crates/hir_ty/src/lib.rs
+++ b/crates/hir_ty/src/lib.rs
@@ -110,7 +110,10 @@ pub type WhereClause = chalk_ir::WhereClause<Interner>;
 
 // FIXME: get rid of this
 pub fn subst_prefix(s: &Substitution, n: usize) -> Substitution {
-    Substitution::intern(s.interned()[..std::cmp::min(s.len(&Interner), n)].into())
+    Substitution::from_iter(
+        &Interner,
+        s.interned()[..std::cmp::min(s.len(&Interner), n)].iter().cloned(),
+    )
 }
 
 /// Return an index of a parameter in the generic type parameter list by it's id.
-- 
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