In the dmd.2.103.0-rc.1, the following code causes a link error when built with the -betterC compile option:
-----------------
struct Data
{
	Data[] range;
	string test;
}

Data[] foo()
{
	Data[] ret;
	if (__ctfe)
	{
		Data tmp;
		tmp.range ~= Data.init;
		ret ~= tmp;
	}
	return ret;
}

void func(Data dat)()
{
}

void bar(Data dat)()
{
	if (dat.test.length)
		func!(dat.range[0])();
}

extern (C) void main()
{
	static immutable data = foo();
	bar!(data[0])();
}
-----------------

$ dmd -betterC main.d
/usr/bin/ld: main.o: in function `main':
main.d:(.text.main[main]+0x5): undefined reference to `_D4main__T3barVSQo4DataS2A1S2nnnZQxFNaNbNiNfZv'
collect2: error: ld returned 1 exit status