Wow, thanks Ovid! I never realized that problem existed. Just to explain, whenever a nextstate op is seen the global variable PL_curcop is set and that's some of what caller() uses. You know line 50 as you enter the loop, then the first line in the loop is 51 but you never reach that outer nextstate op to say you're testing a condition on line 50 again. I bet if you were really interested in solving this problem in a JFDI way that you could change that "goto 9" to be "goto 2" or promote the conditional expression into a do{} block. But that way lies madness so you won't do that.

### caller() will report line 50.
2  <;> nextstate(main 2 x:50) v
3  <{> enterloop(next->8 last->d redo->4) v
9  <0> pushmark s
a  <#> gv[*X] s/EARLYCV
b  <1> entersub[t2] sKS/TARG,1
c  <|> and(other->4) vK/1
       ### caller() will report line 51
4      <;> nextstate(main 1 x:51) v
5      <0> pushmark s
6      <#> gv[*Y] s/EARLYCV
7      <1> entersub[t4] vKS/TARG,1
8      <0> unstack v
           goto 9
d  <2> leaveloop vK/2
e  <@> leave[1 ref] vKP/REFC
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