(causes crash because field node_strict_node_ids doesn't exist)

more than one recursive call is fused with a case that is not at the root,
previously the recursive calls could get different function indices, causing
the compiler to crash

of a case and is also used in another alternative,
these lets were not added to the list of lets closed by cases,
now they are, and the let will be reopened in the other alternative

and also in another alternative of the outside case,
if a let is used in a case, close the let, but if the let is used
in another alternative of the case, reopen the let,
these lets are collected in rms_counted_let_vars

(for patterns with variables)

backendpreprocess may number variables incorrectly, causing a crash
in backend.dll,
renamed VI_CaseVar to VI_CaseOrStrictLetVar

for example: Start = dynamic length

explicit import of a type is missing on a cycle of definition modules)

Case expressions (including cases not usings dynamics) in functions
using dynamics.

instead of crash in backend