code review 3973052: gc: fix send precedence

src/cmd/gc/go.y

 // 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.
 
 /*
  * Go language grammar.
  *
  * The Go semicolon rules are:
  *
  *  1. all statements and declarations are terminated by semicolons.
@@ skipping 75 matching lines @@
 %type   <list>  hidden_funres
 %type   <list>  ohidden_funres
 %type   <list>  hidden_funarg_list ohidden_funarg_list
 %type   <list>  hidden_interfacedcl_list ohidden_interfacedcl_list
 %type   <list>  hidden_structdcl_list ohidden_structdcl_list
 
 %type   <type>  hidden_type hidden_type_misc hidden_pkgtype
 %type   <type>  hidden_type_func
 %type   <type>  hidden_type_recv_chan hidden_type_non_recv_chan
 
+%left           LCOMM   /* outside the usual hierarchy; here for good error messages */
+
 %left           LOROR
 %left           LANDAND
-%left           LCOMM
 %left           LEQ LNE LLE LGE LLT LGT
 %left           '+' '-' '|' '^'
 %left           '*' '/' '%' '&' LLSH LRSH LANDNOT
 
 /*
  * manual override of shift/reduce conflicts.
  * the general form is that we assign a precedence
  * to the token being shifted and then introduce
  * NotToken with lower precedence or PreferToToken with higher
  * and annotate the reducing rule accordingly.
@@ skipping 1836 matching lines @@
 static void
 fixlbrace(int lbr)
 {
         // If the opening brace was an LBODY,
         // set up for another one now that we're done.
         // See comment in lex.c about loophack.
         if(lbr == LBODY)
                 loophack = 1;
 }