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mitigates #19364 [backport]; we make this bug more unlikely to appear by producing better code to begin with; real fix will come later (#19647)

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Andreas Rumpf 2022-03-26 06:37:04 +01:00 • committed by GitHub
commit 12a0f88a52
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1 changed files with 12 additions and 6 deletions
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18
compiler/lowerings.nim
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@ -74,14 +74,20 @@ proc lowerTupleUnpacking*(g: ModuleGraph; n: PNode; idgen: IdGenerator; owner: P
let value = n.lastSon let value = n.lastSon
result = newNodeI(nkStmtList, n.info) result = newNodeI(nkStmtList, n.info)
var temp = newSym(skTemp, getIdent(g.cache, genPrefix), nextSymId(idgen), var tempAsNode: PNode
owner, value.info, g.config.options) let avoidTemp = value.kind == nkSym
temp.typ = skipTypes(value.typ, abstractInst) if avoidTemp:
incl(temp.flags, sfFromGeneric) tempAsNode = value
else:
var temp = newSym(skTemp, getIdent(g.cache, genPrefix), nextSymId(idgen),
owner, value.info, g.config.options)
temp.typ = skipTypes(value.typ, abstractInst)
incl(temp.flags, sfFromGeneric)
tempAsNode = newSymNode(temp)
var v = newNodeI(nkVarSection, value.info) var v = newNodeI(nkVarSection, value.info)
let tempAsNode = newSymNode(temp) if not avoidTemp:
v.addVar(tempAsNode, value) v.addVar(tempAsNode, value)
result.add(v) result.add(v)
for i in 0..<n.len-2: for i in 0..<n.len-2: