[[FIX]] Remove dead code for parameter parsing
[[FIX]] Remove dead code for parameter parsing

The removed code was made superfluous by a recent commit that unified
logic for function parameter parsing [1]. Since then, it has been
unreachable so it is safe to remove.

[1] Title: Re-use code to parse "fat arrow" function params
    Commit: 7430ee539ca2fe1a443b71908b5c36d1689581f5

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