to prevent access to uninitialized value in is_tail_call_modulo_cons_node

this doesn't cause any problems, but valgrind complains

this doesn't cause any problems, but valgrind complains

(modification of bug fix submitted by Mart Lubbers)

this is used if a type synonym is expanded that creates a type application
of an existential variable,
for example :: T a b :== a (T2 b), and a is existential

that is/are only used if one of these masks was used

is created when fusing a case with a constructor pattern containing a variable that
is used more than once

previously the type of the constructor in the type definition was used,
but this is incorrect if the type contains type variables, it introduces (an) unbound variable(s)
(that may cause the compiler to crash) and the type may be too general

(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