internal: Store closures with "tupled" inputs #21335
Merged
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And remove it when needed, the opposite of what was previously, where we stored without a tuple and tupled for the solver (because it requires that).
Because this is what rustc does, and generally, the closer we follow rustc, the easier our lives become.
The weird name
signature_unclosure()also comes from rustc.As an aside: we need to fix our coercion due to rust-lang/rust#148602.