diff --git a/examples/src/Builder.jetl b/examples/src/Builder.jetl
new file mode 100644
index 00000000000..6bd3bf4aa5c
--- /dev/null
+++ b/examples/src/Builder.jetl
@@ -0,0 +1,43 @@
+object AntBuilder() {
+
+  lazy val groovy = library {
+    classpath("$libs/groovy-...")
+  }
+
+  lazy val gant = library {
+    new File("$gantHome/lib").files.each {
+      classpath(it)
+    }
+  }
+
+  lazy val JPS = module {
+    targetLevel = "1.5"
+    classpath(antLayout, gant, groovy)
+    src("$projectHome/antLayout/src")
+  }
+
+}.build()
+
+class AntBuilder {
+  abstract class ClassPathEntry {}
+
+  class Module : ClassPathEntry {
+    fun classpath(entries : ClassPathEntry...) { ... }
+    var targetLevel : String
+    fun src(src : String) { ... }
+  }
+
+  class Library : ClassPathEntry {
+    fun classpath(entries : ClassPathEntry...) { ... }
+  }
+
+  fun library(initializer : Library.{ => Library}) {
+    val lib = new Library()
+    initializer(lib)
+    return lib
+  }
+
+  fun classpath
+
+  fun module
+}
\ No newline at end of file
diff --git a/grammar/src/class_members.grm b/grammar/src/class_members.grm
index 30b0e2499e5..baec24de919 100644
--- a/grammar/src/class_members.grm
+++ b/grammar/src/class_members.grm
@@ -1,3 +1,4 @@
+/*
 class Example(a : Foo, i : Int) : Bar(i), Some {
   // constrtuctors:
   public this(a : Foo) : this(a, 0)
@@ -25,7 +26,7 @@ class Example(a : Foo, i : Int) : Bar(i), Some {
     private set(s : String) { $z = s } // TODO: allow to omit the type here?
   }
 }
-
+*/
 
 // h5. Grammar
 
diff --git a/grammar/src/extension.grm b/grammar/src/extension.grm
index fa5449b95ee..2e623f7ab15 100644
--- a/grammar/src/extension.grm
+++ b/grammar/src/extension.grm
@@ -9,9 +9,9 @@ completeExtension
   ;
 
 extensionMethod
-  : accessModifier? "extension" "fun" type "." functionRest
+  : accessModifier? "fun" type "." functionRest
   ;
 
 extensionProperty
-  : accessModifier? "extension" propertyRest
+  : accessModifier? propertyModifier? ("val" | "var") type "." propertyRest
   ;
diff --git a/grammar/src/types.grm b/grammar/src/types.grm
index eaadb9bc7f6..918ed6a0635 100644
--- a/grammar/src/types.grm
+++ b/grammar/src/types.grm
@@ -25,7 +25,7 @@ projectionSpecifier
   ;
 
 functionType
-  : "{" functionTypeContents "}"
+  : (type ".")? "{" functionTypeContents "}"
   ;
 
 functionTypeContents