three small changes to acid.

remove extraneous blank line here:
cpu% acid 169453
/proc/169453/text:386 plan 9 executable
    <<< this one!
/sys/lib/acid/port
/sys/lib/acid/386

fix unary + not to crash:
cpu% /n/sources/plan9/386/bin/acid
8.out:386 plan 9 executable

/sys/lib/acid/port
/sys/lib/acid/386
acid: +1
acid 169539: suicide: sys: trap: fault read addr=0x8 pc=0x000059f6

force printing of unary + expressions:
cpu% acid
8.out:386 plan 9 executable
/sys/lib/acid/port
/sys/lib/acid/386
acid: {}
acid: +{}
{}
acid: 

i could have sworn that this was a documented feature
that i was just restoring, but i can't find where i
saw it documented.


Reference: /n/sources/patch/applied/acid
Date: Tue Dec  4 07:19:30 CET 2007
Signed-off-by: rsc@swtch.com

--- /sys/src/cmd/acid/main.c	Tue Dec  4 07:17:24 2007
+++ /sys/src/cmd/acid/main.c	Tue Dec  4 07:17:24 2007
@@ -279,7 +279,7 @@
 		print("%s: (error) syminit: %r\n", argv0);
 		return;
 	}
-	print("%s:%s\n\n", s, fhdr.name);
+	print("%s:%s\n", s, fhdr.name);
 
 	if(mach->sbreg && lookup(0, mach->sbreg, &sym)) {
 		mach->sb = sym.value;
--- /sys/src/cmd/acid/expr.c	Tue Dec  4 07:17:27 2007
+++ /sys/src/cmd/acid/expr.c	Tue Dec  4 07:17:25 2007
@@ -333,6 +333,10 @@
 {
 	Node l, r;
 
+	if(n->right == nil){	// unary +
+		expr(n->left, res);
+		return;
+	}
 	expr(n->left, &l);
 	expr(n->right, &r);
 	res->fmt = l.fmt;
--- /sys/src/cmd/acid/exec.c	Tue Dec  4 07:17:27 2007
+++ /sys/src/cmd/acid/exec.c	Tue Dec  4 07:17:27 2007
@@ -84,7 +84,7 @@
 	switch(n->op) {
 	default:
 		expr(n, &res);
-		if(ret || (res.type == TLIST && res.l == 0))
+		if(ret || (res.type == TLIST && res.l == 0 && n->op != OADD))
 			break;
 		prnt->right = &res;
 		expr(prnt, &xx);