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yacc: allow unicode in identifiers

--- a/sys/src/cmd/yacc.c

+++ b/sys/src/cmd/yacc.c

@@ -3,8 +3,6 @@

 #include <bio.h>

 #include <ctype.h>

-#define	Bungetrune	Bungetc		/* ok for now. */

-

 /*

  * all these are 32 bit

  */

@@ -1756,9 +1754,9 @@

 			Bungetrune(finput);

 			return NUMBER;

 		}

-		if(islower(c) || isupper(c) || c=='_' || c=='.' || c=='$')  {

+		if(isalpharune(c) || c=='_' || c=='.' || c=='$')  {

 			i = 0;

-			while(islower(c) || isupper(c) || isdigit(c) ||

+			while(isalpharune(c) || isdigit(c) ||

 			    c == '-' || c=='_' || c=='.' || c=='$') {

 				if(reserve && isupper(c))

 					c += 'a'-'A';

@@ -2023,7 +2021,7 @@

 			}

 			goto loop;

 		}

-		if(isupper(c) || islower(c) || c == '_' || c == '.') {

+		if(isalpharune(c) || c == '_' || c == '.') {

 			int tok; /* tok used oustide for type info */

 			/* look for $name */

-- 

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