code review 4810057: gc: diagnose (x) := 0

src/cmd/gc/go.h

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 #include        <u.h>
 #include        <libc.h>
 #include        <bio.h>
 
 #undef OAPPEND
 
@@ skipping 375 matching lines @@
         OINDEX, OINDEXMAP,
         OKEY, OPARAM,
         OLEN,
         OMAKE, OMAKECHAN, OMAKEMAP, OMAKESLICE,
         OHMUL, ORRC, OLRC,      // high-mul and rotate-carry
         OMUL, ODIV, OMOD, OLSH, ORSH, OAND, OANDNOT,
         ONEW,
         ONOT, OCOM, OPLUS, OMINUS,
         OOROR,
         OPANIC, OPRINT, OPRINTN,
+        OPAREN,
         OSEND,
         OSLICE, OSLICEARR, OSLICESTR,
         ORECOVER,
         ORECV,
         ORUNESTR,
         OSELRECV,
         OSELRECV2,
         OIOTA,
         OREAL, OIMAG, OCOMPLEX,
 
@@ skipping 853 matching lines @@
 Node*   nodarg(Type*, int);
 void    nopout(Prog*);
 void    patch(Prog*, Prog*);
 Prog*   unpatch(Prog*);
 void    zfile(Biobuf *b, char *p, int n);
 void    zhist(Biobuf *b, int line, vlong offset);
 void    zname(Biobuf *b, Sym *s, int t);
 void    data(void);
 void    text(void);