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flagtags's Issues

Unadressable value when embedding structs

There's a bug where an embedded structure is not properly traversed.

For example:

package main

type Base struct {
  Name string
}

type Config struct {
  *Base
}

func main() {
  var cfg Config
  flagtags.MustParseFlags(&cfg)
}
panic: reflect.Value.Addr of unaddressable value

goroutine 1 [running]:
reflect.Value.Addr({0x0?, 0x0?, 0x159496f?})
        /usr/local/go/src/reflect/value.go:271 +0x65
github.com/sebnyberg/flagtags.flagsFromField({{0x12d975e, 0x4}, {0x0, 0x0}, {0x17ce568, 0x13da2e0}, {0x0, 0x0}, 0x0, ..)
        /home/seb/go/pkg/mod/github.com/sebnyberg/[email protected]/flagtags.go:128 +0x29a
github.com/sebnyberg/flagtags.ParseFlagsWithOpts({0x13da340, 0xc00012b5f0?}, {{0x0, 0x0}})
        /home/seb/go/pkg/mod/github.com/sebnyberg/[email protected]/flagtags.go:87 +0x3c5
github.com/sebnyberg/flagtags.MustParseFlagsWithOpts({0x13da340?, 0xc00012b5f0?}, {{0x0?, 0x43dd65?}})
        /home/seb/go/pkg/mod/github.com/sebnyberg/[email protected]/flagtags.go:40 +0x2c
github.com/sebnyberg/flagtags.MustParseFlags(...)
        /home/seb/go/pkg/mod/github.com/sebnyberg/[email protected]/flagtags.go:34

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