{{- range $interface := .Interfaces }}

func (ec *executionContext) _{{$interface.Name}}(ctx context.Context, sel ast.SelectionSet, obj {{$interface.Type | ref}}) graphql.Marshaler {
	switch obj := (obj).(type) {
	case nil:
		return graphql.Null
	{{- range $implementor := $interface.Implementors }}
		case {{$implementor.Type | ref}}:
			{{- if $implementor.CanBeNil }}
				if obj == nil {
					return graphql.Null
				}
			{{- end }}
			return ec._{{$implementor.Name}}(ctx, sel, {{ if $implementor.TakeRef }}&{{ end }}obj)
	{{- end }}
	default:
		panic(fmt.Errorf("unexpected type %T", obj))
	}
}

{{- end }}