The following code snippet results in this error: `Error: '=copy' is not
available for type <Obje>; requires a copy because it's not the last read of
'r[]'; routine: main`.
I'm clearly trying to copy `r` by dereferencing it, so I was expecting the
`'=copy' is not available` error but the compiler is saying the actual problem
is that's not the last read of `r`. What's going on here? Is the compiler
inserting some reads for `r`? Or is the `=copy` hook error hardcoded that way?
type
Obje = object
x, y, z, w: float64
Robje = ref Obje
proc `=copy`(x: var Obje, y: Obje) {.error.}
proc mutate(ob: var Obje) =
ob.x += 1
ob.y += 2
proc main() =
var e = Obje(x: 1, y: 2)
var r = Robje(x: 3, y: 4)
echo r.repr
mutate(r[])
echo r.repr
e = r[]
when isMainModule:
main()
Run
