branch Component* was accepted but did not progress the lexer

[gak]

If I just leave the autocomplete fields as they are, giving an invalid cron, I get a panic:

panic: /Users/gak/src/ftlchickenegg/chicken/chicken.go:1:9: branch Component* was accepted but did not progress the lexer at /Users/gak/src/ftlchickenegg/chicken/chicken.go:1:9 (" ")

package chicken

import (
	"context"
)

//ftl:cron Minutes Hours DayOfMonth Month DayOfWeek
func Name(ctx context.Context) error {
	// TODO: Implement
	return nil
}

It's also in the wrong position.

• Fix the panic
• Report the correct line:col