Control characters in the file yacc.c

[photon]

I noticed some control characters in an output file from bison. Tracking
back it would seem they are being included from the file yacc.c at the
following line numbers 
line 757
line 953
line 956

>From yacc.c in package bison-2.3a.tar.gz

I couldn't see the reason for these control characters being there.
Apologies in advance if this is the way it's supposed to be.


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