Module changes, found Type_Incomplete error

modules/Arena.core

@@ -16,7 +16,14 @@ Init :: (a: *Arena)
   a.memory    = OS.Reserve(DEFAULT_RESERVE_SIZE)
   a.alignment = DEFAULT_ALIGNMENT
   a.di        = ArenaDI++
-  // a.allocator.proc = arena_allocator_proc
+
+FromBuffer :: (buffer: []U8): Arena
+  a: Arena
+  a.memory.reserve = Len(buffer)->U64
+  a.memory.commit  = Len(buffer)->U64
+  a.alignment      = DEFAULT_ALIGNMENT
+  a.di             = ArenaDI++
+  return a
 
 PushSize :: (a: *Arena, size: Base.SizeU): *void
   generous_size := size + a.alignment
@@ -31,15 +38,5 @@ PushSize :: (a: *Arena, size: Base.SizeU): *void
   a.len += size
   return result
 
-// @todo: Make this compile time thing!!!
-// This probably will wait till polymorphism stuff
-// something like this:
-// PushType :: (a: *Arena, type: $T): *T
-//
-PushType :: (a: *Arena, type: Type): *void
-  type_info := get_type_info(type)
-  Assert(type_info != 0)
-  return PushSize(a, type_info.size->Base.SizeU)
-
 Release :: (a: *Arena)
   OS.Release(&a.memory)