<<X Y Z>> no longer works in z3

[DavidKinder]

From Johan Berntsson:

I have discovered a bug in Inform6 and I want to ask if you can make sure that it is being fixed in a future upgrade.

I and some friends are making a new standard library for small computers (think Commodore 64) which is called PunyInform: https://github.com/johanberntsson/PunyInform We are testing this on both z3 and z5, while the Inform stdlib no longer works on z3. What I have discovered is that <> no longer works in z3. It doesn't return from the function as it is supposed to (the implicit rtrue isn't generated).

The problem is line 173 on states.c:
assemblez_4(call_zc, AO, AO2, AO3, AO4);
should instead be:
assemblez_4_to(call_zc, AO, AO2, AO3, AO4, temp_var1);

Since the temp_var1 is missing the next instruction (the rtrue) will be assumed to be a global variable location instead, so the rtrue is never executed, causing the problem (but only in z1-z3 of course; z5 etc works). I have recompiled the Inform compiler and confirmed that this change solves the problem.

I have attached the fixed and working states.c. Can you make sure that the fix finds its way into the official repository?
states.c.txt

[erkyrath]

I've verified this fix. Simple test case:

Constant Story "Minimal";
Constant Headline "^Headline.^";

[ Main;
	print "Hello.^";
	<Blorb 1 2>;
	print "More.^";
	<<Frotz 3 4>>;
	print "Should not reach here.^";
];

[ BlorbSub; ];
[ FrotzSub; ];

[erkyrath]

erkyrath@78d9953

[erkyrath]

I rejiggered my github repo so it's a fork of yours, so now I can make PRs and everything. :)