From b245297bd949029c02f962cebe26f139d860e12d Mon Sep 17 00:00:00 2001
From: dgp <dgp@users.sourceforge.net>
Date: Sun, 5 Nov 2006 03:33:56 +0000
Subject:         TIP#274 IMPLEMENTATION

        * generic/tclParseExpr.c:       Exponentiation operator is now
        * tests/expr.test:              right associative.  [Patch 1556802]
---
 ChangeLog              | 7 +++++++
 generic/tclParseExpr.c | 8 ++++++--
 tests/expr.test        | 5 ++++-
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 3883a50..7e9544c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2006-11-04  Don Porter  <dgp@users.sourceforge.net>
+
+	TIP#274 IMPLEMENTATION
+
+	* generic/tclParseExpr.c:	Exponentiation operator is now
+	* tests/expr.test:		right associative.  [Patch 1556802]
+
 2006-11-03  Miguel Sofer  <msofer@users.sf.net>
 
 	* generic/tclBasic.c (TEOVI): fix por possible leak of a Command
diff --git a/generic/tclParseExpr.c b/generic/tclParseExpr.c
index d1044fd..6f9103b 100644
--- a/generic/tclParseExpr.c
+++ b/generic/tclParseExpr.c
@@ -12,7 +12,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclParseExpr.c,v 1.46 2006/11/02 15:58:08 dgp Exp $
+ * RCS: @(#) $Id: tclParseExpr.c,v 1.47 2006/11/05 03:33:56 dgp Exp $
  */
 
 #include "tclInt.h"
@@ -521,8 +521,8 @@ Tcl_ParseExpr(
 		    break;
 		}
 
-		/* Special association rules for the ternary operators */
 		if (prec[otherPtr->lexeme] == precedence) {
+		    /* Special association rules for the ternary operators. */
 		    if ((otherPtr->lexeme == QUESTION) 
 			    && (lastOrphanPtr->lexeme != COLON)) {
 			break;
@@ -531,6 +531,10 @@ Tcl_ParseExpr(
 			    && (nodePtr->lexeme == QUESTION)) {
 			break;
 		    }
+		    /* Right association rules for exponentiation. */
+		    if (nodePtr->lexeme == EXPON) {
+			break;
+		    }
 		}
 
 		/* Some checks before linking */
diff --git a/tests/expr.test b/tests/expr.test
index 9fc56e5..7064f17 100644
--- a/tests/expr.test
+++ b/tests/expr.test
@@ -10,7 +10,7 @@
 # See the file "license.terms" for information on usage and redistribution
 # of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 #
-# RCS: @(#) $Id: expr.test,v 1.64 2006/10/30 16:30:36 dgp Exp $
+# RCS: @(#) $Id: expr.test,v 1.65 2006/11/05 03:33:57 dgp Exp $
 
 if {[lsearch [namespace children] ::tcltest] == -1} {
     package require tcltest 2.1
@@ -980,6 +980,9 @@ test expr-23.46 {INST_EXPON: Bug 1561260} -body {
 test expr-23.47 {INST_EXPON: Bug 1561260} {
     expr 2**32*5**32
 } 1[string repeat 0 32]
+test expr-23.48 {INST_EXPON: TIP 274: right assoc} {
+expr 2**3**4
+} 2417851639229258349412352
 
 # Some compilers get this wrong; ensure that we work around it correctly
 test expr-24.1 {expr edge cases; shifting} {expr int(5)>>32} 0
-- 
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