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Nim/lib/system
ringabout 9e1d0d1513 fixes #4695; closure iterators support for JS backend (#23493)
fixes #4695

ref https://github.com/nim-lang/Nim/pull/15818

Since `nkState` is only for the main loop state labels and `nkGotoState`
is used only for dispatching the `:state` (since
https://github.com/nim-lang/Nim/pull/7770), it's feasible to rewrite the
loop body into a single case-based dispatcher, which enables support for
JS, VM backend. `nkState` Node is replaced by a label and Node pair and
`nkGotoState` is only used for intermediary processing. Backends only
need to implement `nkBreakState` and `closureIterSetupExc` to support
closure iterators.

pending https://github.com/nim-lang/Nim/pull/23484

<del> I also observed some performance boost for C backend in the
release mode (not in the danger mode though, I suppose the old
implementation is optimized into computed goto in the danger mode)
</del>

allPathsAsgnResult???
2024-04-18 18:52:30 +02:00
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