Parsing of values and functions is not consistent

Motivation

It's very strange to me, that in the following snippet f gets parsed as a single FunBind, while y gets parsed as two FunBinds (and fails to compile afterwards).

f x | True = 42
f x = 0

y | True = 42
y = 0

I think this is useful in let blocks.

Proposal

Parse such values and functions in the same way.

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