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DAA and 'out' parameters (#20506)

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* DAA and 'out' parameters

* progress

* documented strictDefs and out parameters

* docs, tests and a bugfix

* fixes silly regression
This commit is contained in:
Andreas Rumpf 2022-10-06 17:08:41 +02:00 • committed by GitHub
commit 0d23419e68
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17 changed files with 289 additions and 53 deletions
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10
compiler/semtypes.nim
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@ -195,9 +195,10 @@ proc semVarargs(c: PContext, n: PNode, prev: PType): PType =
localError(c.config, n.info, errXExpectsOneTypeParam % "varargs")
addSonSkipIntLit(result, errorType(c), c.idgen)
proc semVarOutType(c: PContext, n: PNode, prev: PType; kind: TTypeKind): PType =
proc semVarOutType(c: PContext, n: PNode, prev: PType; flags: TTypeFlags): PType =
if n.len == 1:
result = newOrPrevType(kind, prev, c)
result = newOrPrevType(tyVar, prev, c)
result.flags = flags
var base = semTypeNode(c, n[0], nil)
if base.kind == tyTypeDesc and not isSelf(base):
base = base[0]
@ -206,7 +207,7 @@ proc semVarOutType(c: PContext, n: PNode, prev: PType; kind: TTypeKind): PType =
base = base[0]
addSonSkipIntLit(result, base, c.idgen)
else:
result = newConstraint(c, kind)
result = newConstraint(c, tyVar)
proc isRecursiveType(t: PType, cycleDetector: var IntSet): bool =
if t == nil:
@ -2015,7 +2016,8 @@ proc semTypeNode(c: PContext, n: PNode, prev: PType): PType =
of nkTypeClassTy: result = semTypeClass(c, n, prev)
of nkRefTy: result = semAnyRef(c, n, tyRef, prev)
of nkPtrTy: result = semAnyRef(c, n, tyPtr, prev)
of nkVarTy: result = semVarOutType(c, n, prev, tyVar)
of nkVarTy: result = semVarOutType(c, n, prev, {})
of nkOutTy: result = semVarOutType(c, n, prev, {tfIsOutParam})
of nkDistinctTy: result = semDistinct(c, n, prev)
of nkStaticTy: result = semStaticType(c, n[0], prev)
of nkIteratorTy: