Set AssignmentPattern = `{}` for friendlier calls with no inputs

[declann]

example with AssignmentPattern used: https://astexplorer.net/#/gist/965a454c0524afb6086335ef7c00a3a2/d641d06c2d38a946f56c6cc1d5be05608aa8d2f4

Without this, calling a() from javascript gives an error

Ensure achieves effect with memo off or on