vlib/v/checker/tests/prefix_addr_err.vv:2:2: warning: unused variable: `b`
    1 | fn main() {
    2 |     b := &'foo'.len
      |     ^
    3 | }
vlib/v/checker/tests/prefix_addr_err.vv:2:7: error: cannot take the address of a literal value
    1 | fn main() {
    2 |     b := &'foo'.len
      |          ~~~~~~~~~~
    3 | }