Linker error

[Namespace]

What's wrong?

Core.lib(object)  Offset 01118H Record Type 0091
  Error 1: Previous Definition Different : 
_D60D:\D\dmd2\windows\bin\..\..\src\druntime\import\object.di.6312__ModuleInfoZ

Core.lib(object)  Offset 011A7H Record Type 00C3
  Error 1: Previous Definition Different : 
_D60D:\D\dmd2\windows\bin\..\..\src\druntime\import\object.di.637__arrayZ

Core.lib(object)  Offset 011D1H Record Type 00C3
  Error 1: Previous Definition Different : 
_D60D:\D\dmd2\windows\bin\..\..\src\druntime\import\object.di.638__assertFiZv

Core.lib(object)  Offset 011FBH Record Type 00C3
  Error 1: Previous Definition Different : 
_D60D:\D\dmd2\windows\bin\..\..\src\druntime\import\object.di.6315__unittest_failFiZv