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implements https://github.com/nim-lang/RFCs/issues/258 (#15503)

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* implements https://github.com/nim-lang/RFCs/issues/258

* don't be too strict with custom pragma blocks

* cast pragmas: documentation

* added most missing inference query procs to effecttraits.nim
This commit is contained in:
Andreas Rumpf 2020-10-06 16:47:15 +02:00 • committed by GitHub
commit 92163fa330
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16 changed files with 232 additions and 68 deletions
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25
compiler/parser.nim
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@ -485,17 +485,24 @@ proc setOrTableConstr(p: var Parser): PNode =
eat(p, tkCurlyRi) # skip '}'
proc parseCast(p: var Parser): PNode =
#| castExpr = 'cast' '[' optInd typeDesc optPar ']' '(' optInd expr optPar ')'
#| castExpr = 'cast' ('[' optInd typeDesc optPar ']' '(' optInd expr optPar ')') /
# ('(' optInd exprColonEqExpr optPar ')')
result = newNodeP(nkCast, p)
getTok(p)
eat(p, tkBracketLe)
optInd(p, result)
result.add(parseTypeDesc(p))
optPar(p)
eat(p, tkBracketRi)
eat(p, tkParLe)
optInd(p, result)
result.add(parseExpr(p))
if p.tok.tokType == tkBracketLe:
getTok(p)
optInd(p, result)
result.add(parseTypeDesc(p))
optPar(p)
eat(p, tkBracketRi)
eat(p, tkParLe)
optInd(p, result)
result.add(parseExpr(p))
else:
result.add p.emptyNode
eat(p, tkParLe)
optInd(p, result)
result.add(exprColonEqExpr(p))
optPar(p)
eat(p, tkParRi)