On Monday, 16 April 2018 at 16:36:48 UTC, Matthias Klumpp wrote:
#2 0x00007ffff51341c8 in _D2rt4util9container5treap__T5TreapTS2gc11gcinterface5RangeZQBf7opApplyMFNbMDFNbKQBtZiZ9__lambda2MFNbKxSQCpQCpQCfZi (e=...) at treap.d:47 dg = {context = 0x7fffffffc140 "\320\065\206", funcptr = 0x7ffff5121d10 <_D2gc4impl12conservativeQw3Gcx7markAllMFNbbZ14__foreachbody3MFNbKSQCm11gcinterface5RangeZi>} #3 0x00007ffff5134238 in _D2rt4util9container5treap__T5TreapTS2gc11gcinterface5RangeZQBf13opApplyHelperFNbxPSQDeQDeQDcQCv__TQCsTQCpZQDa4NodeMDFNbKxSQDiQDiQCyZiZi (node=0x7568700, dg=...) at treap.d:221
Indeed, this is iteration over Treap!Range used to store ranges added with addRange method.
https://github.com/ldc-developers/druntime/blob/ldc/src/gc/impl/conservative/gc.d#L2182
