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Juanma Barranquero authored
font-lock-variable-name-face, to highlight function arguments in `describe-function' and `describe-key'. (help-do-arg-highlight): Auxiliary function to highlight a given list of arguments in a string. (help-highlight-arguments): Highlight the function arguments and all uses of them in the docstring. (describe-function-1): Use it. Do docstring output via `insert', not 'princ', so text attributes are preserved.
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