nimrod pretty crash

gistfile1.txt

# echo > bar.nim
# nimrod pretty bar.nim
config/nimrod.cfg(38, 2) Hint: added path: '/home/def/.babel/pkgs/' [Path]
Hint: used config file '/home/def/nimrod/config/nimrod.cfg' [Conf]
Hint: system [Processing]
lib/system.nim(53, 9) Error: name should be: Ptr
lib/system.nim(54, 9) Error: name should be: Ref
lib/system.nim(53, 2) Error: name should be: Ptr
lib/system.nim(54, 2) Error: name should be: Ref
lib/system.nim(129, 10) Error: name should be: t
Traceback (most recent call last)
nimrod.nim(91)           nimrod
nimrod.nim(55)           handleCmdLine
main.nim(345)            mainCommand
main.nim(177)            commandPretty
modules.nim(193)         compileProject
modules.nim(186)         compileSystemModule
modules.nim(152)         compileModule
passes.nim(193)          processModule
passes.nim(137)          processTopLevelStmt
sem.nim(415)             myProcess
sem.nim(384)             semStmtAndGenerateGenerics
semstmts.nim(1376)       semStmt
semexprs.nim(867)        semExprNoType
semexprs.nim(2125)       semExpr
semstmts.nim(1201)       semProc
semstmts.nim(1068)       semProcAux
semstmts.nim(837)        semParamList
semtypes.nim(877)        semProcTypeNode
semtypes.nim(844)        semParamType
semtypes.nim(1215)       semTypeNode
semtypes.nim(1056)       semProcTypeWithScope
semtypes.nim(897)        semProcTypeNode
semtypes.nim(764)        liftParamType
semtypes.nim(830)        liftParamType
suggest.nim(334)         markUsed
pretty.nim(153)          checkUse
SIGSEGV: Illegal storage access. (Attempt to read from nil?)