.cursor implementation (#12637)

* 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
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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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@ -101,3 +101,4 @@ proc initDefines*(symbols: StringTableRef) =
defineSymbol("nimFixedForwardGeneric")
defineSymbol("nimnomagic64")
defineSymbol("nimNewShiftOps")
defineSymbol("nimHasCursor")