From d0c6c06ca1d077656d95c8526a07a4e7c32d9aa7 Mon Sep 17 00:00:00 2001
From: Ayaz Hafiz <ayaz@rwx.com>
Date: Wed, 11 May 2022 09:06:25 -0400
Subject: [PATCH] Remove KnownSizeIterator

---
 compiler/constrain/src/expr.rs | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/compiler/constrain/src/expr.rs b/compiler/constrain/src/expr.rs
index 62d12a5038..e50d73eb85 100644
--- a/compiler/constrain/src/expr.rs
+++ b/compiler/constrain/src/expr.rs
@@ -12,7 +12,6 @@ use roc_can::expr::Expr::{self, *};
 use roc_can::expr::{AccessorData, AnnotatedMark, ClosureData, Field, WhenBranch};
 use roc_can::pattern::Pattern;
 use roc_collections::all::{HumanIndex, MutMap, SendMap};
-use roc_collections::KnownSizeIterator;
 use roc_module::ident::{Lowercase, TagName};
 use roc_module::symbol::{ModuleId, Symbol};
 use roc_region::all::{Loc, Region};
@@ -1684,10 +1683,10 @@ fn attach_resolution_constraints(
     constraint: Constraint,
 ) -> Constraint {
     let resolution_constrs = env.resolutions_to_make.drain(..).map(Constraint::Resolve);
-    constraints.and_constraint(KnownSizeIterator::from_2(
-        std::iter::once(constraint),
-        resolution_constrs,
-    ))
+    let all_constrs: Vec<_> = std::iter::once(constraint)
+        .chain(resolution_constrs)
+        .collect();
+    constraints.and_constraint(all_constrs)
 }
 
 fn constrain_def(