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special typing rules for owned pointers

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This commit is contained in:
Andreas Rumpf 2019-03-03 19:00:05 +01:00
commit a6d49c3a81
6 changed files with 52 additions and 19 deletions
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4
compiler/semexprs.nim
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@ -1516,6 +1516,10 @@ proc asgnToResultVar(c: PContext, n, le, ri: PNode) {.inline.} =
n.sons[1] = takeImplicitAddr(c, ri, x.typ.kind == tyLent)
x.typ.flags.incl tfVarIsPtr
#echo x.info, " setting it for this type ", typeToString(x.typ), " ", n.info
# Special typing rule: do not allow to pass 'owned T' to 'T' in 'result = x':
if ri.typ != nil and ri.typ.skipTypes(abstractInst).kind == tyOwned and
le.typ != nil and le.typ.skipTypes(abstractInst).kind != tyOwned:
localError(c.config, n.info, "cannot return an owned pointer as an unowned pointer")
template resultTypeIsInferrable(typ: PType): untyped =
typ.isMetaType and typ.kind != tyTypeDesc