Re: Subtle bugs in interval code.

[Johan Bockgård]

address@hidden (Kim F. Storm) writes:

> Note that we cannot just use plist-get instead of memq, as we then
> cannot differentiate between "property is on list with nil value"
> and "property is not on list".

    plist-member is a built-in function in `src/fns.c'.
    (plist-member plist prop)

    Return non-nil if plist has the property prop.
    plist is a property list, which is a list of the form
    (PROP1 VALUE1 PROP2 VALUE2 ...).  prop is a symbol.
    Unlike `plist-get', this allows you to distinguish between a missing
    property and a property with the value nil.
    The value is actually the tail of plist whose car is prop.

-- 
Johan Bockgård