(not creating a let appears to be far more common)

when copying an algebraic type extension from the definition to the implementation module

convert member types in module backendconvert,
store pointer from field selector to member type in backend with BESetMemberTypeOfField

add BENumberedVarTypeNode and BENumberedTypeVar to set tv_argument_nr in type definitions,
add BESetMemberTypeOfField to store the member type of dictionary fields

add BENumberedVarTypeNode, BENumberedTypeVar and BESetMemberTypeOfField to backend dll/shared library
import and export files

add BESetMemberTypeOfField to store the member type of dictionary fields

used for type definitions, type_var_heap is passed to and from this function

remove more unused fields

function parseCommandLine in module compile removes these