Parameter storage class in is an equivalent of const currently; see a…

[carblue]

…lso discussion in issue #17928; may change later to const scope

[dlang-bot]

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Bugzilla references

Auto-close	Bugzilla	Description
✗	17928	[scope] in is not treated as const scope

[MetaLang]

I'm gonna go out on a limb here and say that a decision is not needed from @andralex or @WalterBright. This change was deliberate on Walter's part and needs to be documented.