Description
In Version 10 of the TON Blockchain, support of addr_var addresses was almost completely cut down. For example, the addr_var cannot be a destination address of external messages, and if it's used for a destination address of an internal message, it is rewritten as an addr_std.
Furthermore, these TVM instructions drop support for anycast addresses and addr_var: LDMSGADDR(Q), PARSEMSGADDR(Q), REWRITESTDADDR(Q), REWRITEVARADDR(Q). They throw an exit code (usually 9) whenever one attempts to apply them to anything, including addr_var addresses.
That hits our parseVarAddress() function and the respective VarAddress struct. We should either remove those entirely or deprecate/turn into a no-op.