diff --git a/packages/squiggle-lang/__tests__/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn_test.res b/packages/squiggle-lang/__tests__/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn_test.res
index a4cc15b3..f3c92f78 100644
--- a/packages/squiggle-lang/__tests__/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn_test.res
+++ b/packages/squiggle-lang/__tests__/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn_test.res
@@ -17,14 +17,6 @@ describe("builtin", () => {
   testEval("1-1", "Ok(0)")
   testEval("2>1", "Ok(true)")
   testEval("concat('a','b')", "Ok('ab')")
-  testEval(
-    "addOne(t)=t+1; toList(Sampleset.map(fromSamples([1,2,3,4,5,6]), addOne))",
-    "Ok([2,3,4,5,6,7])",
-  )
-  testEval(
-    "toList(mapSamplesN([fromSamples([1,2,3,4,5,6]), fromSamples([6, 5, 4, 3, 2, 1])], {|x| x[0] > x[1] ? x[0] : x[1]}))",
-    "Ok([6,5,4,4,5,6])",
-  )
 })
 
 describe("builtin exception", () => {
diff --git a/packages/squiggle-lang/__tests__/SquiggleLibrary/SquiggleLibrary_FunctionRegistryLibrary_test.res b/packages/squiggle-lang/__tests__/SquiggleLibrary/SquiggleLibrary_FunctionRegistryLibrary_test.res
index 1dcf0471..7a1564f7 100644
--- a/packages/squiggle-lang/__tests__/SquiggleLibrary/SquiggleLibrary_FunctionRegistryLibrary_test.res
+++ b/packages/squiggle-lang/__tests__/SquiggleLibrary/SquiggleLibrary_FunctionRegistryLibrary_test.res
@@ -17,6 +17,7 @@ describe("FunctionRegistry Library", () => {
     testEvalToBe("List.last([3,5,8])", "Ok(8)")
     testEvalToBe("List.reverse([3,5,8])", "Ok([8,5,3])")
     testEvalToBe("double(x)=2*x; arr=[1,2,3]; List.map(arr, double)", "Ok([2,4,6])")
+    testEvalToBe("double(x)=2*x; arr=[1,2,3]; map(arr, double)", "Ok([2,4,6])")
     testEvalToBe("myadd(acc,x)=acc+x; arr=[1,2,3]; List.reduce(arr, 0, myadd)", "Ok(6)")
     testEvalToBe("change(acc,x)=acc*x+x; arr=[1,2,3]; List.reduce(arr, 0, change)", "Ok(15)")
     testEvalToBe("change(acc,x)=acc*x+x; arr=[1,2,3]; List.reduceReverse(arr, 0, change)", "Ok(9)")
@@ -60,6 +61,15 @@ describe("FunctionRegistry Library", () => {
     testEvalToBe("Dist.logScore({estimate: normal(5,2), answer: 4.5})", "Ok(1.6433360626394853)")
     testEvalToBe("Dist.klDivergence(normal(5,2), normal(5,1.5))", "Ok(0.06874342818671068)")
     testEvalToBe("Sampleset.fromList([3,5,2,3,5,2,3,5,2,3,3,5])", "Ok(Sample Set Distribution)")
+    testEvalToBe("Sampleset.fromList([3,5,2,3,5,2,3,5,2,3,3,5])", "Ok(Sample Set Distribution)")
+    testEvalToBe(
+      "addOne(t)=t+1; Sampleset.toList(Sampleset.map(Sampleset.fromList([1,2,3,4,5,6]), addOne))",
+      "Ok([2,3,4,5,6,7])",
+    )
+    testEvalToBe(
+      "toList(Sampleset.mapN([Sampleset.fromList([1,2,3,4,5,6]), Sampleset.fromList([6, 5, 4, 3, 2, 1])], {|x| x[0] > x[1] ? x[0] : x[1]}))",
+      "Ok([6,5,4,4,5,6])",
+    )
   })
 
   describe("Fn auto-testing", () => {
diff --git a/packages/squiggle-lang/package.json b/packages/squiggle-lang/package.json
index 3dd90839..52c9f07c 100644
--- a/packages/squiggle-lang/package.json
+++ b/packages/squiggle-lang/package.json
@@ -15,9 +15,9 @@
     "start": "rescript build -w -with-deps",
     "clean": "rescript clean && rm -rf dist",
     "test:reducer": "jest __tests__/Reducer*/",
-    "test:current": "jest __tests__/SquiggleLibrary/SquiggleLibrary_FunctionRegistryLibrary_test.bs.js",
     "benchmark": "ts-node benchmark/conversion_tests.ts",
     "test": "jest",
+    "test:lib": "jest __tests__/SquiggleLibrary/SquiggleLibrary_FunctionRegistryLibrary_test.bs.js",
     "test:ts": "jest __tests__/TS/",
     "test:rescript": "jest --modulePathIgnorePatterns=__tests__/TS/*",
     "test:watch": "jest --watchAll",
diff --git a/packages/squiggle-lang/src/rescript/FunctionRegistry/FunctionRegistry_Core.res b/packages/squiggle-lang/src/rescript/FunctionRegistry/FunctionRegistry_Core.res
index f1dde98b..f4864531 100644
--- a/packages/squiggle-lang/src/rescript/FunctionRegistry/FunctionRegistry_Core.res
+++ b/packages/squiggle-lang/src/rescript/FunctionRegistry/FunctionRegistry_Core.res
@@ -280,11 +280,11 @@ module Matcher = {
 
   module RegistryMatch = {
     type match = {
-      namespace: option<string>,
+      namespace: string,
       fnName: string,
       inputIndex: int,
     }
-    let makeMatch = (namespace: option<string>, fnName: string, inputIndex: int) => {
+    let makeMatch = (namespace: string, fnName: string, inputIndex: int) => {
       namespace: namespace,
       fnName: fnName,
       inputIndex: inputIndex,
@@ -303,7 +303,7 @@ module Matcher = {
       let fullMatch = functionMatchPairs->E.A.getBy(((_, match)) => Match.isFullMatch(match))
       fullMatch->E.O.bind(((fn, match)) =>
         switch match {
-        | FullMatch(index) => Some(RegistryMatch.makeMatch(namespace, fn.name, index))
+        | FullMatch(index) => Some(RegistryMatch.makeMatch(fn.nameSpace, fn.name, index))
         | _ => None
         }
       )
@@ -326,7 +326,7 @@ module Matcher = {
         ->E.A2.fmap(((fn, match)) =>
           switch match {
           | SameNameDifferentArguments(indexes) =>
-            indexes->E.A2.fmap(index => RegistryMatch.makeMatch(namespace, fn.name, index))
+            indexes->E.A2.fmap(index => RegistryMatch.makeMatch(fn.nameSpace, fn.name, index))
           | _ => []
           }
         )
@@ -355,10 +355,7 @@ module Matcher = {
     ): option<fnDefinition> =>
       registry.functions
       ->E.A.getBy(fn => {
-        switch namespace {
-        | Some(ns) => ns === fn.nameSpace && fnName === fn.name
-        | _ => fnName === fn.name
-        }
+        namespace === fn.nameSpace && fnName === fn.name
       })
       ->E.O.bind(fn => E.A.get(fn.definitions, inputIndex))
   }
@@ -511,7 +508,7 @@ module Registry = {
       `There are function matches for ${fnName}(), but with different arguments: ${defs}`
     }
 
-    let match = Matcher.Registry.findMatches(modified, fnName, args)
+    // let match = Matcher.Registry.findMatches(modified, fnName, args); Js.log2("Match", match)
 
     switch Matcher.Registry.findMatches(modified, fnName, args) {
     | Matcher.Match.FullMatch(match) =>