should compile with csources again

compiler/ast.nim

@@ -681,7 +681,6 @@ type
     heapRoot*: PRope          # keeps track of the enclosing heap object that
                               # owns this location (required by GC algorithms
                               # employing heap snapshots or sliding views)
-    #a*: int                   # location's "address", i.e. slot for temporaries
 
   # ---------------- end of backend information ------------------------------
 

todo.txt

@@ -15,9 +15,7 @@ Concurrency
 -----------
 
 - test 'deepCopy' for closures
-
 - implement 'foo[1..4] = spawn(f[4..7])'
-- document the new 'spawn' and 'parallel' statements
 
 Low priority:
 - support for exception propagation? (hard to implement)