ReplaceLoop(), If(FindLoop(...)) errors

[jodavies]

Syntax errors in these functions don't terminate FORM, so something like

Symbol x;
CFunction f,g,h;
Index i1,...,i3;

Local test =
	+ g(i1,i2)*g(i1,i2)
	+ g(i1,i2)*g(i1,i3)
	+ g(i1,i2,i3)*g(i1,i2,i3)
	+ h(i1,i2)*h(i1,i2)
	+ h(i1,i2)*h(i1,i3)
	+ h(i1,i2,i3)*h(i1,i2,i3)
	;

ReplaceLoop g, arguments=2, loopsize=2, outfun=f;
ReplaceLoop g, arguments=2, loopsize=2, outfun=f;
ReplaceLoop g, arguments=3, loopsize=2, outfun=f;

If (FindLoop(h, loopsize=1));
    Multiply x;
EndIf;

Print +s;
.end

produces nonsense.

compcomm.c:DoFindLoop should probably just Terminate at the syntax label, and goto it in all error cases and not just some of them.

[tueda]

It seems that error = 1 is missing in DoFindLoop and CoIf (which calls CoFindLoop).