Apologies, actually it was trickier than I thought, the issue happens in
not fully defined C types only. So here is an example that runs in go
1.19.5, but fails in go 1.20
```
package main
/*
// Forward reference of C++ types.
struct SomeType;
typedef struct SomeType SomeType;
// Fully defined type.
typedef struct {
char C;
} FullyDefinedType;
*/
import "C"
import (
"fmt"
)
type Wrapper[T any] struct {
P *T
}
type SomeTypeHolder struct {
*Wrapper[C.SomeType]
}
type FullyDefinedTypeHolder struct {
*Wrapper[C.FullyDefinedType]
}
func main() {
//var p *C.SomeType
var x SomeTypeHolder
var y FullyDefinedTypeHolder
fmt.Printf("x.Wrapper=%x\n", x.Wrapper)
fmt.Printf("y.Wrapper=%x\n", y.Wrapper)
}
```
In go 1.19.5 it prints:
$ go run .
x.Wrapper=0
y.Wrapper=0
In go 1.20 it prints:
$ go run .
# ...
./main.go:22:3: cannot use incomplete (or unallocatable) type as a type
argument: main._Ctype_struct_SomeType
THanks!
On Thursday, February 16, 2023 at 9:35:09 AM UTC+1 Jan Mercl wrote:
> On Thu, Feb 16, 2023 at 8:22 AM Jan <pfe...@gmail.com> wrote:
>
> > Any thoughts ?
>
> A minimal, self-contained and runnable reproducer would be rather
> useful in this case.
>
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