pub const UNDECODABLE_INSTRUCTION: ContractInstruction;Expand description
Instruction stored by BasicEagerInstructions::decode() in slots whose bytes do not decode
into a valid instruction and after the last one.
Contract code is only expected to contain legal instructions, so this is only reachable by
jumping into the middle of one or by falling through the end of the code. unimp always fails,
so it never continues to the next instruction, as BasicEagerInstructions::decode()
requires.