[swift-evolution] [Proposal] Use inout at function call sites

[Brent Royal-Gordon]

> P.S. At one point we thought about requiring you to declare "assignment" in your operator declaration, and disallowing inout parameters from arbitrary other operators, but that didn't actually turn into a proposal. It's not a bad idea, though—just a bit of compiler-enforced consistency.

Are there any `inout` operators which don't have `=` at the end of their name?

-- 
Brent Royal-Gordon
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