Line number in Proc#inspect

lambda e$B$rI=<($7$?;~!"9THV9f$,e(B 0 e$B$K$J$k$N$G$9$,$3$l$O0U?^$;$6e(B
e$B$k$b$N$G$O$J$$$G$7$g$&$+!#e(B

% ./ruby -ve 'p lambda {}
p lambda {}
p lambda {}

ruby 1.9.0 (2007-06-29 patchlevel 0) [i686-linux]
#<Proc:0xb7d5fbf8@-e:0 (lambda)>
#<Proc:0xb7d5fbbc@-e:0 (lambda)>
#<Proc:0xb7d5fb94@-e:0 (lambda)>