Line numbers reported by the byte compiler

[Eli Zaretskii]

What line is the byte compiler supposed to report with the messages
it prints?  Is that the exact line where it found the problem, or
maybe the first line of the function where the problem happens?

When I try byte-compiling lisp/term/internal.el, I see this warning:

  lisp/term/internal.el: In dos-cpNNN-setup
  lisp/term/internal.el:589: warning: reference to free variable 
tex-mode-syntax-table

However, the variable tex-mode-syntax-table is referenced in line
629, not 589.  Line 589 is where the function dos-cpNNN-setup begins.