[Issue 16528] @safe inference does not work for mutually recursive functions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=16528

--- Comment #3 from Walter Bright <bugzilla at digitalmars.com> ---
A minimal test case:

void fun1()()
{
    fun2();
}

void fun2()()
{
    fun1();
}

@safe void test()
{
    fun1();
}

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