In Scheme mode, Emacs font locks the form:

(define (in-vicinity-proc dir)
  (lambda (filename)
    (in-vicinity dir filename)))

with ‘define’ as a keyword and ‘in-vicinity-proc’ as a function name,
using font-lock-{keyword,function-name}-face, respectively.  That's fine.
However, for this form:

(define ((in-vicinity-proc dir) filename)
  (in-vicinity dir filename))

then Emacs font locks only ‘define’.  I have locally modified
‘scheme-font-lock-keywords-1’ to change "zero or one parens"
to "zero or more parens" and that change seems to DTRT.
Could someone please review the patch below and apply it?

thi

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