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Richard Smith
cb5e2e1597
* Treat `MaybeUnformed` and `partial` as qualifiers, like `const`. * Allow pointer conversions to add qualifiers. * Allow unsafe pointer conversions to remove qualifiers. * Allow conversions on non-reference expressions to drop `const`. * Allow unsafe conversions on any expression to drop `const`. * Allow unsafe conversions on non-initializing expressions to drop `partial`. For initializing expressions, we should initialize the vptr when dropping `partial`; this is not yet supported so we reject. * Allow conversions on reference expressions to add `MaybeUnformed`. * Allow unsafe conversions on reference expressions to drop `MaybeUnformed`. For non-reference expressions, additional work is required, because the value / initializing representation may not match between `T` and `MaybeUnformed(T)`, so those are rejected for now.