Parser breaks for a variant with @as

https://rescript-lang.org/try?version=v11.0.0-rc.6&code=AIVwdgRg9gHgpgEwFABcCeAHOACAhmAZwHc4AnbAXiW2wB9sAVOGFACgJVIEswBzASmp1sAWRAAbFFwDKccXADGbXKVK40AHg7c+APkE16AeRQALMqwDewXAVYAiAGoBBADIBVAKL3+2AG644iBwAFzY2jy8ADQAvoIA9PHYAMJQALYYXPIE2PG0ADpISKCQsIiomDj4xGSUQvRMLOyckQbCYpIycorKqupaLXptxmYW1rYOLh7evgFBoeGDvHFIidgAQiAo2ABmUKRpuCgotaRwaVB+cDmj2Arph1HYRKZcCqbYEGe4ANY35tgMCoCGQgA