vlib/v/checker/tests/unsafe_c_calls_should_be_checked.vv:2:13: warning: function `C.malloc` must be called from an `unsafe` block
    1 | fn test_c() {
    2 |     mut p := C.malloc(4)
      |                ~~~~~~~~~
    3 |     s := 'hope'
    4 |     C.memcpy(p, s.str, 4)
vlib/v/checker/tests/unsafe_c_calls_should_be_checked.vv:4:4: warning: function `C.memcpy` must be called from an `unsafe` block
    2 |     mut p := C.malloc(4)
    3 |     s := 'hope'
    4 |     C.memcpy(p, s.str, 4)
      |       ~~~~~~~~~~~~~~~~~~~
    5 | }