false negatives reported by vtest:

**   top   === logexpect l1 -wait
**   l1    Waiting for logexp
**** l1    match|       1005 VCL_use         c vcl1
***  l1    expecting| expect 0 = ReqURL struct
**** l1    err  |       1005 ReqURL          c /encode
---- l1    bad| expectation failed