misc/emacs: don't treat (foo)(bar) as a function call when preceded by a word character.

Fixes #6531.

R=adonovan
CC=golang-dev
https://golang.org/cl/14523043

misc/emacs/go-mode.el

@@ -249,7 +249,7 @@ For mode=set, all covered lines will have this weight."
 
    (if go-fontify-function-calls
        `((,(concat "\\(" go-identifier-regexp "\\)[[:space:]]*(") 1 font-lock-function-name-face) ;; function call/method name
-         (,(concat "(\\(" go-identifier-regexp "\\))[[:space:]]*(") 1 font-lock-function-name-face)) ;; bracketed function call
+         (,(concat "[^[:word:][:multibyte:]](\\(" go-identifier-regexp "\\))[[:space:]]*(") 1 font-lock-function-name-face)) ;; bracketed function call
      `((,go-func-meth-regexp 1 font-lock-function-name-face))) ;; method name
 
    `(