https://github.com/D-Programming-Language/druntime/blob/master/src/core/stdc/signal.d
When @nogc was added to the top of that file, the type of sigfn_t changed from "void function(int) extern (C) @system nothrow" to "void function(int) extern (C) @system nothrow @nogc".
This breaks some code such as the ae library used by Digger. (The @nogc annotation is now required on signal handlers). The argument for requiring @nogc on C library callbacks makes sense to me, so I'd like to know if this was intentional.
