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support cstring in case (#20130)

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* implement case for cstring

for now just converts to string on C backend

* custom implementation for cstring

* remove leftover

* revert even more

* add nil + fix packages weird variant literal bug

* update docs
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metagn 2022-09-01 19:10:00 +03:00 • committed by GitHub
commit a95b6391fd
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13 changed files with 126 additions and 18 deletions
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compiler/sempass2.nim
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@ -684,7 +684,7 @@ proc trackCase(tracked: PEffects, n: PNode) =
let oldState = tracked.init.len
let oldFacts = tracked.guards.s.len
let stringCase = n[0].typ != nil and skipTypes(n[0].typ,
abstractVarRange-{tyTypeDesc}).kind in {tyFloat..tyFloat128, tyString}
abstractVarRange-{tyTypeDesc}).kind in {tyFloat..tyFloat128, tyString, tyCstring}
let interesting = not stringCase and interestingCaseExpr(n[0]) and
tracked.config.hasWarn(warnProveField)
var inter: TIntersection = @[]