warning: Test #1: Compile-time constant [-Wuser]
    at isconst.asm::test_expr(10) <- isconst.asm(14)
error: Expected constant expression: `UnknownLabel` is not constant at assembly time
    at isconst.asm::test_expr(9) <- isconst.asm(15)
warning: Test #3: Compile-time constant [-Wuser]
    at isconst.asm::test_expr(10) <- isconst.asm(21)
warning: Test #4: Compile-time constant [-Wuser]
    at isconst.asm::test_expr(10) <- isconst.asm(22)
error: Expected constant expression: `FloatingLabel` is not constant at assembly time
    at isconst.asm::test_expr(9) <- isconst.asm(28)
warning: Test #6: Compile-time constant [-Wuser]
    at isconst.asm::test_expr(10) <- isconst.asm(29)
Assembly aborted with 2 errors!