Implement placeholder attribute to prevent multiple derive_wheres with different paths
#37
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ModProg
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ModProg
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This addresses a suggestion I made in #36. It implements a placeholder attribute that is applies when a
derive_whereattribute is processed. Any subsequent calls toderive_wherewith different paths will error out when they find this attribute.Additionally:
#[derive_where(crate = "derive_where_")]option.#[derive_where(Zeroize(crate = "::zeroize"))]because this is already the default.