> reported as RT#131930
Thanks, the bug report shows that __LINE__ gets confused while parsing and compiling the code, which is not the fault of the debugger.
Of course a warn in the test script would have demonstrated the wrong __LINE__ too.
update
> Bisecting this was a bit tricky,
well, with help of the warn statements hinting to __LINE__, it would have been much easier.
update
turns out that the git on my win-box runs under v5.26, and it's easily demonstrated there:
$ perl -v
This is perl 5, version 26, subversion 2 (v5.26.2) built for x86_64-ms
+ys-thread-multi
$ perl
warn "before";
s(x)
(y);
warn "after";
__END__
before at - line 1.
after at - line 3.
$ perl
warn "before";
s/x/y/;
warn "after";
__END__
before at - line 1.
after at - line 3.
$ perl -MO=Concise
warn "before";
s(x)
(y);
warn "after";
__END__
d <@> leave[1 ref] vKP/REFC ->(end)
1 <0> enter ->2
2 <;> nextstate(main 1 -:1) v:{ ->3
5 <@> warn[t1] vK/1 ->6
3 <0> pushmark s ->4
4 <$> const[PV "before"] s ->5
6 <;> nextstate(main 1 -:2) v:{ ->7
8 </> subst(/"x"/) vK ->9
7 <$> const[PV "y"] s ->8
9 <;> nextstate(main 1 -:3) v:{ ->a # should be :4 not :3
c <@> warn[t2] vK/1 ->d
a <0> pushmark s ->b
b <$> const[PV "after"] s ->c
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