diff --git a/tests/WebSharper.Tests/ASTTests.fsx b/tests/WebSharper.Tests/ASTTests.fsx
index 17b9424f..91da5153 100644
--- a/tests/WebSharper.Tests/ASTTests.fsx
+++ b/tests/WebSharper.Tests/ASTTests.fsx
@@ -28,8 +28,6 @@
 #r "../../build/Release/netstandard2.0/WebSharper.Core.dll"
 #r "../../build/Release/netstandard2.0/WebSharper.JavaScript.dll"
 #r "../../build/Release/netstandard2.0/WebSharper.Main.dll"
-#r "../../build/Release/netstandard2.0/WebSharper.MathJS.dll"
-#r "../../build/Release/netstandard2.0/WebSharper.MathJS.Extensions.dll"
 #r "../../build/Release/netstandard2.0/WebSharper.Collections.dll"
 #r "../../build/Release/netstandard2.0/WebSharper.Control.dll"
 #r "../../build/Release/netstandard2.0/WebSharper.Web.dll"
@@ -288,8 +286,6 @@ let wsRefs =
         "WebSharper.Collections"
         "WebSharper.Control"
         "WebSharper.Web"
-        "WebSharper.MathJS"
-        "WebSharper.MathJS.Extensions"
         "WebSharper.Testing"
         //"WebSharper.Sitelets"
         //"WebSharper.Tests"
@@ -440,11 +436,14 @@ let translate isBundle source =
     
         //printfn "trimmedMeta: %A" trimmedMeta
 
-        let pkg = WebSharper.Compiler.JavaScriptPackager.bundleAssembly WebSharper.Core.JavaScript.JavaScript trimmedMeta trimmedMeta "TestProject" comp.EntryPoint WebSharper.Compiler.JavaScriptPackager.OnLoadIfExists
+        let pkg = 
+            WebSharper.Compiler.JavaScriptPackager.bundleAssembly WebSharper.Core.JavaScript.JavaScript trimmedMeta trimmedMeta "TestProject" comp.EntryPoint WebSharper.Compiler.JavaScriptPackager.OnLoadIfExists
+        let pkg, _ =
+            pkg |> WebSharper.Compiler.JavaScriptWriter.transformProgram WebSharper.Core.JavaScript.JavaScript WebSharper.Core.JavaScript.Readable
     
         //printfn "packaged: %s" (WebSharper.Core.AST.Debug.PrintStatement (WebSharper.Core.AST.Block pkg))
 
-        let js, _, _ = WebSharper.Compiler.JavaScriptPackager.programToString WebSharper.Core.JavaScript.JavaScript WebSharper.Core.JavaScript.Readable WebSharper.Core.JavaScript.Writer.CodeWriter pkg
+        let js, _, _ = WebSharper.Compiler.JavaScriptPackager.programToString WebSharper.Core.JavaScript.Readable WebSharper.Core.JavaScript.Writer.CodeWriter pkg false
         printfn "%s" js
     
     else
@@ -457,7 +456,8 @@ let translate isBundle source =
         let jsFiles = 
             pkg 
             |> Array.map (fun (file, p) ->
-                let js, _, _ = WebSharper.Compiler.JavaScriptPackager.programToString WebSharper.Core.JavaScript.JavaScript WebSharper.Core.JavaScript.Readable WebSharper.Core.JavaScript.Writer.CodeWriter p
+                let p, _ = p |> WebSharper.Compiler.JavaScriptWriter.transformProgram WebSharper.Core.JavaScript.JavaScript WebSharper.Core.JavaScript.Readable
+                let js, _, _ = WebSharper.Compiler.JavaScriptPackager.programToString WebSharper.Core.JavaScript.Readable WebSharper.Core.JavaScript.Writer.CodeWriter p false
                 file, js
             )
 
@@ -509,14 +509,22 @@ open WebSharper
 open WebSharper.JavaScript
 open System.Collections.Generic
 
-[<JavaScript>]
-module MyTest =
+[<JavaScript; Struct>]
+type Position =
+    {
+        pos_fname: string
+        pos_lnum: int
+        pos_orig_lnum: int
+    }
+
+    member pos.Line = pos.pos_lnum
+
+    member pos.NextLine =
+        let pos = pos
+        { pos with
+            pos_lnum = pos.Line + 1
+        }
 
-    let Main() =
-        let f x y = x + y
-        let g() =
-            f 1 2 + f 2 3
-        g() + g()
 """
 
 //translate """
diff --git a/tests/WebSharper.Tests/Basis.fs b/tests/WebSharper.Tests/Basis.fs
index 0533a17d..82cd0618 100644
--- a/tests/WebSharper.Tests/Basis.fs
+++ b/tests/WebSharper.Tests/Basis.fs
@@ -631,20 +631,19 @@ let Tests =
             )
         }
 
-        Skip "Anonymous records" {
-            //let x = IM.AnonRecord({| A = 42 |})
-            //equal x.B 42
-            //equal {| x with C = 3|} (New ["B" => 42; "C" => 3])
-            //let a, b = 
-            //    match IM.AnonRecordInUnion() with
-            //    | IM.AnonRecordTest r -> r.A, r.B
-            //equal a 3
-            //equal b "hi"
-            //equal {| A = 1; B = ValueNone; C = ValueSome 3 |} (New ["A" => 1; "C" => 3])
-            //equal {| A = 1; B = None; C = Some 3 |} (New ["A" => 1; "C" => 3])
-            //let s = struct {| A = 5 |}
-            //equal s.A 5
-            expect 0
+        Test "Anonymous records" {
+            let x = IM.AnonRecord({| A = 42 |})
+            equal x.B 42
+            equal {| x with C = 3|} (New ["B" => 42; "C" => 3])
+            let a, b = 
+                match IM.AnonRecordInUnion() with
+                | IM.AnonRecordTest r -> r.A, r.B
+            equal a 3
+            equal b "hi"
+            equal {| A = 1; B = ValueNone; C = ValueSome 3 |} (New ["A" => 1; "C" => 3])
+            equal {| A = 1; B = None; C = Some 3 |} (New ["A" => 1; "C" => 3])
+            let s = struct {| A = 5 |}
+            equal s.A 5
         }
 
         Test "Implicit yield" {
diff --git a/tests/WebSharper.Tests/Object.fs b/tests/WebSharper.Tests/Object.fs
index 0003575b..49754372 100644
--- a/tests/WebSharper.Tests/Object.fs
+++ b/tests/WebSharper.Tests/Object.fs
@@ -137,6 +137,22 @@ type StructRecord =
 type StructRecord2 =
     { SR2 : int; SR2b : string }
 
+[<JavaScript; Struct>]
+type Position =
+    {
+        pos_fname: string
+        pos_lnum: int
+        pos_orig_lnum: int
+    }
+
+    member pos.Line = pos.pos_lnum
+
+    member pos.NextLine =
+        let pos = pos
+        { pos with
+            pos_lnum = pos.Line + 1
+        }
+
 [<CompilationRepresentation (CompilationRepresentationFlags.UseNullAsTrueValue)>]
 type U =
     | U0