vlib/v/checker/tests/unsafe_c_calls_should_be_checked.vv:3:16: warning: function `C.malloc` must be called from an `unsafe` block
    1 | 
    2 | fn test_c() {
    3 |     mut p := C.malloc(4)
      |                ~~~~~~~~~
    4 |     s := 'hope'
    5 |     C.memcpy(p, s.str, 4)
vlib/v/checker/tests/unsafe_c_calls_should_be_checked.vv:5:7: warning: function `C.memcpy` must be called from an `unsafe` block
    3 |     mut p := C.malloc(4)
    4 |     s := 'hope'
    5 |     C.memcpy(p, s.str, 4)
      |       ~~~~~~~~~~~~~~~~~~~
    6 | }
