impl.ff

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
template impl(lst...)
@nogc nothrow extern (C)
static if(lst.length == 1)
static if(is(typeof(__traits(getMember, symbol, lst[0])) == function))
alias ff = AliasSeq!(__traits(getMember, symbol, lst[0]))[0]

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