On Thursday, July 4, 2019 at 2:52:42 AM UTC+2, Ian Lance Taylor wrote:
>
> On Wed, Jul 3, 2019 at 4:39 PM Gert <gert....@gmail.com <javascript:>>
> wrote:
> >
> > On Thursday, July 4, 2019 at 12:39:34 AM UTC+2, Ian Lance Taylor wrote:
> >>
> >> On Wed, Jul 3, 2019 at 3:30 PM Gert <gert....@gmail.com> wrote:
> >> >
> >> > I changed /usr/local/go/src/builtin/builtin.go
> >> >
> >> > type error interface {
> >> > Error() string
> >> > Unwrap() wrapper.Wrapper
> >> > }
> >> >
> >> > But after compiling go successfully with ./all.bash it seems type
> error is stil
> >> >
> >> > type error interface {
> >> > Error() string
> >> > }
> >>
> >> The type "error" is implemented directly in the Go compiler. The code
> >> in builtin/builtin.go only exists for documentation purposes. If you
> >> want to change error, you'll need to change the compiler.
> >
> >
> > Ok thx trying to dig my way in /usr/local/go/src/go but grepping for
> error interface doesn't give me a clue where I can find the predefined
> error interface :( do you perhaps have a path of a filename for me please
> where it get defined?
>
> It's created by makeErrorInterface in
> cmd/compile/internal/gc/universe.go. But I have no idea what the
> consequences of changing that function would be. I would not be
> surprised if other code in the compiler implicitly assumes the current
> definition.
>
> Ian
>
Thanks before I going to shoot myself in the foot let start by making a new
build in wrapper interface first in that file
func makeWrapperInterface() *types.Type {
field := types.NewField()
field.Type = types.Types[TSTRING]
f := functypefield(fakeRecvField(), nil, []*types.Field{field})
field = types.NewField()
field.Sym = lookup("Wrapper")
field.Type = f
t := types.New(TINTER)
t.SetInterface([]*types.Field{field})
return t
}
So basically this should generate a new build in
type wrapper interface {
Unwrap() wrapper
}
Because referencing to a wrapper.Wrapper pretty sure that's already out of
the question :)
The lookup function gives me a hint that there might be some definition
files that describe the interface in plain text? If true do you know where
I can find does files specifically the error interface definition file?
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