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.cursor implementation (#12637)

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* cursors: first implementation
* added currently failing test
* .cursor works for doubly linked lists
* make -d:useMalloc work again
* added code to nil out refs in a destructor
* it's now called --gc:arc
* renderer.nim: render nkBreakState properly
* make simple closure iterators work without leaking
This commit is contained in:
Andreas Rumpf 2019-11-12 15:05:36 +01:00 • committed by GitHub
commit dfb020b174
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12 changed files with 106 additions and 36 deletions
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lib/core/runtime_v2.nim
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@ -47,7 +47,7 @@ proc nimNewObj(size: int): pointer {.compilerRtl.} =
when defined(nimscript):
discard
elif defined(useMalloc):
var orig = c_malloc(s)
var orig = c_malloc(cuint s)
nimZeroMem(orig, s)
result = orig +! sizeof(RefHeader)
else: