code review 3483041: use the new %U format for runes

src/cmd/goyacc/goyacc.go

 /*
 Derived from Inferno's utils/iyacc/yacc.c
 http://code.google.com/p/inferno-os/source/browse/utils/iyacc/yacc.c
 
 This copyright NOTICE applies to all files in this directory and
 subdirectories, unless another copyright notice appears in a given
 file or subdirectory.  If you take substantial code from this software to use in
 other programs, you must somehow include with it an appropriate
 copyright notice that includes the copyright notice and the other
 notices below.  It is fine (and often tidier) to do that in a separate
@@ skipping 3121 matching lines @@
                         goto out
                 }
         }
         c = 0
 
 out:
         if c == 0 {
                 c = yyTok2[1] /* unknown char */
         }
         if yyDebug >= 3 {
-                fmt.Printf("lex %.4x %s\n", uint(yychar), yyTokname(c))
+                fmt.Printf("lex %U %s\n", uint(yychar), yyTokname(c))
         }
         return c
 }
 
 func yyParse(yylex yyLexer) int {
         var yyn int
         var yylval yySymType
         var YYVAL yySymType
         YYS := make([]yySymType, yyMaxDepth)
 
@@ skipping 145 matching lines @@
                 yystate = yyAct[yyj]
                 if yyChk[yystate] != -yyn {
                         yystate = yyAct[yyg]
                 }
         }
         // dummy call; replaced with literal code
         yyrun()
         goto yystack /* stack new state and value */
 }
 `