diff --git a/hkmc2/shared/src/test/mlscript/ucs/patterns/RestTuple.mls b/hkmc2/shared/src/test/mlscript/ucs/patterns/RestTuple.mls
index e87ddce96..5a865cccc 100644
--- a/hkmc2/shared/src/test/mlscript/ucs/patterns/RestTuple.mls
+++ b/hkmc2/shared/src/test/mlscript/ucs/patterns/RestTuple.mls
@@ -1,8 +1,8 @@
 :js
 :ucs desugared
 
-fun tupleSlice(xs, i, j) = globalThis.Array.prototype.slice.call(xs, i, xs.length - j)
-fun tupleGet(xs, i) = globalThis.Array.prototype.at.call(xs, i)
+:import ../Prelude/Tuple.mls
+//│ Imported 2 member(s)
 
 // Drop the first and last elements.
 tupleSlice([1, 2, 3, 4], 1, -1)
@@ -23,7 +23,7 @@ fun stupid(xs) = if xs is
 //│ Desugared:
 //│ >  if
 //│ >    xs@59 is []>=0 and
-//│ >      let $rest@60 = globalThis:block#1#666.tupleSlice‹member:tupleSlice›(xs@59#2, 0, 0)
+//│ >      let $rest@60 = globalThis:import#Tuple#666.tupleSlice‹member:tupleSlice›(xs@59#2, 0, 0)
 //│ >      let ys@61 = $rest@60#0
 //│ >      else ys@61#666
 //│ >    xs@59 is []=0 then "empty"
@@ -58,8 +58,8 @@ fun foo(xs) = if xs is
 //│ >  if
 //│ >    xs@71 is []>=2 and
 //│ >      let $first0@74 = xs@71#2.0
-//│ >      let $rest@73 = globalThis:block#1#666.tupleSlice‹member:tupleSlice›(xs@71#3, 1, 1)
-//│ >      let $last0@72 = globalThis:block#1#666.tupleGet‹member:tupleGet›(xs@71#4, -1)
+//│ >      let $rest@73 = globalThis:import#Tuple#666.tupleSlice‹member:tupleSlice›(xs@71#3, 1, 1)
+//│ >      let $last0@72 = globalThis:import#Tuple#666.tupleGet‹member:tupleGet›(xs@71#4, -1)
 //│ >      let x@75 = $first0@74#0
 //│ >      let ys@76 = $rest@73#0
 //│ >      let y@77 = $last0@72#0
@@ -108,8 +108,8 @@ fun nested_tuple_patterns(xs) = if xs is
 //│ >  if
 //│ >    xs@96 is []>=2 and
 //│ >      let $first0@99 = xs@96#2.0
-//│ >      let $rest@98 = globalThis:block#1#666.tupleSlice‹member:tupleSlice›(xs@96#3, 1, 1)
-//│ >      let $last0@97 = globalThis:block#1#666.tupleGet‹member:tupleGet›(xs@96#4, -1)
+//│ >      let $rest@98 = globalThis:import#Tuple#666.tupleSlice‹member:tupleSlice›(xs@96#3, 1, 1)
+//│ >      let $last0@97 = globalThis:import#Tuple#666.tupleGet‹member:tupleGet›(xs@96#4, -1)
 //│ >      let x@100 = $first0@99#0
 //│ >      $rest@98 is []=2 and
 //│ >        let $first0@102 = $rest@98#1.0
diff --git a/hkmc2/shared/src/test/mlscript/ucs/prelude/Tuple.mls b/hkmc2/shared/src/test/mlscript/ucs/prelude/Tuple.mls
new file mode 100644
index 000000000..c0052ed86
--- /dev/null
+++ b/hkmc2/shared/src/test/mlscript/ucs/prelude/Tuple.mls
@@ -0,0 +1,2 @@
+fun tupleSlice(xs, i, j) = globalThis.Array.prototype.slice.call(xs, i, xs.length - j)
+fun tupleGet(xs, i) = globalThis.Array.prototype.at.call(xs, i)