`BIT STRING` bit descriptions are missing from the generated code

[jbeyerstedt]

The MAPEM contains BIT STRINGs with a fixed definition what each bit means. It looks like this in ASN.1:

LaneAttributes-Vehicle ::= BIT STRING {
 isVehicleRevocableLane (0),
 isVehicleFlyOverLane (1),
 hovLaneUseOnly (2),
 restrictedToBusUse (3),
 restrictedToTaxiUse (4),
 restrictedFromPublicUse (5),
 hasIRbeaconCoverage (6),
 permissionOnRequest (7)
} (SIZE (8,...))

But the only generated code is this:

#[derive(AsnType, Debug, Clone, Decode, Encode, PartialEq, Eq, Hash)]
#[rasn(delegate, identifier = "LaneAttributes-Vehicle", size("8", extensible))]
pub struct LaneAttributesVehicle(pub BitString);

The information which bit offset has which meaning (e.g. by providing an enum with integer mapping) is missing from the generated code! So there's no way to extract information like restrictedToBusUse from the LaneAttributesVehicle data type.

[jbeyerstedt]

There seems to be some support for named bits (see librasn/compiler#65 and associated PR), bit it looks like this does not include BIT STRINGs which have a size which is greater than the number of named bits it contains.

EDIT: The current implementation does not export named bits in any case. I opened a new feature request: librasn/compiler#158