error: label-diff.asm(28) -> label-diff.asm::print_diff(19):
    Expected constant expression: 'Known' is not constant at assembly time
error: label-diff.asm(28) -> label-diff.asm::print_diff(20):
    Expected constant expression: 'Known' is not constant at assembly time
error: label-diff.asm(30) -> label-diff.asm::print_diff(19):
    Expected constant expression: 'Unknown' is not constant at assembly time
error: label-diff.asm(30) -> label-diff.asm::print_diff(20):
    Expected constant expression: 'Unknown' is not constant at assembly time
error: label-diff.asm(32) -> label-diff.asm::print_diff(19):
    Expected constant expression: 'Known' is not constant at assembly time
error: label-diff.asm(32) -> label-diff.asm::print_diff(20):
    Expected constant expression: 'Unknown' is not constant at assembly time
error: label-diff.asm(34) -> label-diff.asm::print_diff(19):
    Expected constant expression: 'Unknown' is not constant at assembly time
error: label-diff.asm(34) -> label-diff.asm::print_diff(20):
    Expected constant expression: 'Unknown2' is not constant at assembly time
error: label-diff.asm(41) -> label-diff.asm::print_diff(19):
    Expected constant expression: 'Known' is not constant at assembly time
error: label-diff.asm(41) -> label-diff.asm::print_diff(20):
    Expected constant expression: 'Known' is not constant at assembly time
error: label-diff.asm(43) -> label-diff.asm::print_diff(19):
    Expected constant expression: 'Unknown' is not constant at assembly time
error: label-diff.asm(43) -> label-diff.asm::print_diff(20):
    Expected constant expression: 'Unknown' is not constant at assembly time
error: label-diff.asm(54) -> label-diff.asm::print_diff(19):
    Expected constant expression: PC is not constant at assembly time
error: label-diff.asm(54) -> label-diff.asm::print_diff(20):
    Expected constant expression: PC is not constant at assembly time
error: label-diff.asm(56) -> label-diff.asm::print_diff(19):
    Expected constant expression: 'Known' is not constant at assembly time
error: label-diff.asm(56) -> label-diff.asm::print_diff(20):
    Expected constant expression: PC is not constant at assembly time
error: label-diff.asm(58) -> label-diff.asm::print_diff(19):
    Expected constant expression: 'Unknown' is not constant at assembly time
error: label-diff.asm(58) -> label-diff.asm::print_diff(20):
    Expected constant expression: PC is not constant at assembly time
Assembly aborted with 18 errors!