Failuer to parse `slog.Level` with `flag redefined`

[head-gardener]

Attempting to fill fields from a structure containing slog.Level, which is a redefinition of int, panics with flag: redefined: <flag-name> at runtime:

/tmp/go-build2849440774/b001/exe/test flag redefined: level
panic: /tmp/go-build2849440774/b001/exe/test flag redefined: level

goroutine 1 [running]:
flag.(*FlagSet).Var(0xc0000bc000, {0x53f268, 0xc0000900a0}, {0xc0000141e0, 0x5}, {0x0, 0x0})
        /nix/store/j9hk9x78z301jqldfyvw72z24vb992qi-go-1.22.6/share/go/src/flag/flag.go:1028 +0x37d
flag.(*FlagSet).Func(...)
        /nix/store/j9hk9x78z301jqldfyvw72z24vb992qi-go-1.22.6/share/go/src/flag/flag.go:980
github.com/itzg/go-flagsfiller.(*FlagSetFiller).processCustom(0xc0000141e0?, {0x504a20, 0xc0000141d0}, 0x51bca8, 0x0?, {0x0?, 0xc000014210?}, 0xc0000bc000, {0xc0000141e0, 0x5}, ...)
        /home/hunter/go/pkg/mod/github.com/itzg/go-flagsfiller@v1.14.0/flagset.go:621 +0x292
github.com/itzg/go-flagsfiller.(*FlagSetFiller).processInt(0x0?, {0x504a20?, 0xc0000141d0?}, 0xfe?, {0x0?, 0xc0000141d0?}, 0x20a20?, {0xc0000141e0?, 0x5e8420?}, {0x0, ...}, ...)
        /home/hunter/go/pkg/mod/github.com/itzg/go-flagsfiller@v1.14.0/flagset.go:410 +0x1cd
github.com/itzg/go-flagsfiller.(*FlagSetFiller).processField(0xc000074040, 0xc0000bc000, {0x504a20, 0xc0000141d0}, {0x4e46fb, 0x5}, {0x540c60, 0x4faf60}, {0x0, 0x0})
        /home/hunter/go/pkg/mod/github.com/itzg/go-flagsfiller@v1.14.0/flagset.go:224 +0x759
github.com/itzg/go-flagsfiller.(*FlagSetFiller).walkFields.func1({{0x4e46fb, 0x5}, {0x0, 0x0}, {0x540c60, 0x4faf60}, {0x0, 0x0}, 0x0, {0xc0000141d8, ...}, ...}, ...)
        /home/hunter/go/pkg/mod/github.com/itzg/go-flagsfiller@v1.14.0/flagset.go:98 +0x1b3
github.com/itzg/go-flagsfiller.(*FlagSetFiller).walkFields(0xc000074040, 0xc0000bc000, {0x0?, 0x7f23091f3108?}, {0x4f8b20?, 0xc0000141d0?, 0xc000074040?}, {0x540c60, 0x4f8b20})
        /home/hunter/go/pkg/mod/github.com/itzg/go-flagsfiller@v1.14.0/flagset.go:156 +0x6fc
github.com/itzg/go-flagsfiller.(*FlagSetFiller).Fill(0xc000074040, 0xc0000bc000, {0x4ee0a0?, 0xc0000141d0?})
        /home/hunter/go/pkg/mod/github.com/itzg/go-flagsfiller@v1.14.0/flagset.go:54 +0x1de
main.main()
        /tmp/tmp.dPTGjwn3vd/main.go:16 +0x47
exit status 2

Minimal example:

package main

import (
	"flag"
	"log/slog"

	"github.com/itzg/go-flagsfiller"
)

func main() {
	var args struct {
		Level slog.Level
	}
	flagsfiller.New().Fill(flag.CommandLine, &args)
}

I'm new to go so sorry in advance if i missed some debug info.

[itzg]

Thanks for reporting this. I am able to recreate the same and can investigate from here.

[itzg]

Should now be fixed in https://github.com/itzg/go-flagsfiller/releases/tag/v1.15.0

[head-gardener]

Can confirm. Thanks for the quick response.