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iterable[T] (#17196)

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* fix failing test toSeq in manual which now works
* changelog
* reject proc fn(a: iterable)
* add iterable to spec
* remove MCS/UFCS limitation that now works
This commit is contained in:
Timothee Cour 2021-04-11 07:25:41 -05:00 • committed by GitHub
commit ceadf54d76
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18 changed files with 254 additions and 40 deletions
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9
compiler/semexprs.nim
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@ -853,7 +853,7 @@ proc semStaticExpr(c: PContext, n: PNode): PNode =
proc semOverloadedCallAnalyseEffects(c: PContext, n: PNode, nOrig: PNode,
flags: TExprFlags): PNode =
if flags*{efInTypeof, efWantIterator} != {}:
if flags*{efInTypeof, efWantIterator, efWantIterable} != {}:
# consider: 'for x in pReturningArray()' --> we don't want the restriction
# to 'skIterator' anymore; skIterator is preferred in sigmatch already
# for typeof support.
@ -877,6 +877,11 @@ proc semOverloadedCallAnalyseEffects(c: PContext, n: PNode, nOrig: PNode,
# error correction, prevents endless for loop elimination in transf.
# See bug #2051:
result[0] = newSymNode(errorSym(c, n))
elif callee.kind == skIterator:
if efWantIterable in flags:
let typ = newTypeS(tyIterable, c)
rawAddSon(typ, result.typ)
result.typ = typ
proc semObjConstr(c: PContext, n: PNode, flags: TExprFlags): PNode
@ -1364,7 +1369,7 @@ proc builtinFieldAccess(c: PContext, n: PNode, flags: TExprFlags): PNode =
onUse(n[1].info, s)
return
n[0] = semExprWithType(c, n[0], flags+{efDetermineType})
n[0] = semExprWithType(c, n[0], flags+{efDetermineType, efWantIterable})
#restoreOldStyleType(n[0])
var i = considerQuotedIdent(c, n[1], n)
var ty = n[0].typ