But second calling `wg_input` causes error:
```ats
#include "share/atspre_define.hats"
#include "share/atspre_staload.hats"
typedef sockaddr_in = @{
sin_port = int,
sin_addr = int,
sin_zero = int
}
typedef sockaddr_in6 = @{
sin6_port = int,
sin6_flowinfo = int,
sin6_addr = int,
sin6_scope_id = int
}
datatype sockaddr =
| Af_inet of sockaddr_in
| Af_inet6 of sockaddr_in6
vtypedef wg_endpoint = @{
e_remote = sockaddr
}
fun wg_input
{l1,l2:addr}
(pfe: !wg_endpoint? @ l1 >> wg_endpoint @ l1, pfso: !sockaddr@l2 | e:
ptr l1, so: ptr l2):
void = let
val () = !e.e_remote := !so
in
()
end
implement main0 () = {
var e: wg_endpoint
var so: sockaddr = Af_inet @{
sin_port = 1,
sin_addr = 2,
sin_zero = 3
}
var so6: sockaddr = Af_inet6 @{
sin6_port = 1,
sin6_flowinfo = 2,
sin6_addr = 3,
sin6_scope_id = 4
}
prval pre = view@e
prval prso = view@so
val () = wg_input(pre, prso | addr@e, addr@so)
prval () = view@e := pre
prval () = view@so := prso
prval pre = view@e
prval prso6 = view@so6
val () = wg_input(pre, prso6 | addr@e, addr@so6)
prval () = view@e := pre
prval () = view@so6 := prso6
}
```
```
$ patscc -o a.out main.dats -DATS_MEMALLOC_LIBC
/home/kiwamu/src/practice-ats/tagged_union/main.dats: 1042(line=56,
offs=21) -- 1045(line=56, offs=24): error(3): the dynamic expression
cannot be assigned the type [S2Eat(S2Etyrec(flt0; npf=-1;
e_remote=S2Etop(knd=0; S2Ecst(sockaddr))), S2EVar(5246))].
/home/kiwamu/src/practice-ats/tagged_union/main.dats: 1042(line=56,
offs=21) -- 1045(line=56, offs=24): error(3): mismatch of static terms
(tyleq):
The actual term is: S2Ecst(sockaddr)
The needed term is: S2Ecst(ptr_type)
/home/kiwamu/src/practice-ats/tagged_union/main.dats: 1042(line=56,
offs=21) -- 1045(line=56, offs=24): error(3): mismatch of static terms
(tyleq):
The actual term is: S2Etyrec(flt0; npf=-1; e_remote=S2Ecst(sockaddr))
The needed term is: S2Etyrec(flt0; npf=-1; e_remote=S2Etop(knd=0;
S2Ecst(sockaddr)))
/home/kiwamu/src/practice-ats/tagged_union/main.dats: 1042(line=56,
offs=21) -- 1045(line=56, offs=24): error(3): mismatch of static terms
(tyleq):
The actual term is: S2Eat(S2Etyrec(flt0; npf=-1;
e_remote=S2Ecst(sockaddr)); S2Evar(e(8482)))
The needed term is: S2Eat(S2Etyrec(flt0; npf=-1;
e_remote=S2Etop(knd=0; S2Ecst(sockaddr)));
S2EVar(5246->S2Evar(e(8482))))
```
Following patch does fix the error:
```diff
--- a/tagged_union/main.dats
+++ b/tagged_union/main.dats
@@ -51,6 +51,7 @@ implement main0 () = {
prval () = view@e := pre
prval () = view@so := prso
+ var e: wg_endpoint
prval pre = view@e
prval prso6 = view@so6
val () = wg_input(pre, prso6 | addr@e, addr@so6)
```
How to re-use initialized argument on `wg_input` function?
Best regards,
--
Kiwamu Okabe
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