Doc fix for lexical-binding being in line one.
Ref http://lists.gnu.org/archive/html/emacs-devel/2012-01/msg00543.html * doc/lispref/variables.texi (Using Lexical Binding): Mention that lexical-binding should be set in the first line. * src/lread.c (syms_of_lread): Doc fix. * lisp/emacs-lisp/tabulated-list.el, lisp/progmodes/f90.el: Move lexical-binding file-local to line one. * etc/NEWS: lexical-binding should be ine the first line.
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