Error code E0692
A repr(transparent)
type was also annotated with other, incompatible
representation hints.
Erroneous code example:
ⓘ
A type annotated as repr(transparent)
delegates all representation concerns to
another type, so adding more representation hints is contradictory. Remove
either the transparent
hint or the other hints, like this:
Alternatively, move the other attributes to the contained type:
Note that introducing another struct
just to have a place for the other
attributes may have unintended side effects on the representation:
Here, Grams2
is a not equivalent to Grams
-- the former transparently wraps
a (non-transparent) struct containing a single float, while Grams
is a
transparent wrapper around a float. This can make a difference for the ABI.