This commit made pointsTo not accept delegates as valid arguments, due to Issue 5875.

https://github.com/D-Programming-Language/phobos/commit/0339b6acdeb74ff28cfa2ec30ec5a192709e8695#std/exception.d

This change broke code that used std.container.SList or std.container.Array with delegates as elements.

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import std.container;

void main() {
    SLIst!(void function()) foo; // works
    SList!(void delegate()) bar; // used to work
}