From: Fred Drake <fdrake@acm.org>
Date: Thu, 30 Aug 2001 18:53:25 +0000 (+0000)
Subject: When re-writing a factor containing a unary negation of a literal, only
X-Git-Tag: v2.2a3~199
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=14ef244dfe8b79694d4baa48ceda874fe27ec05d;p=thirdparty%2FPython%2Fcpython.git

When re-writing a factor containing a unary negation of a literal, only
affect nodes without another operator.  This was causing negated
exponentiations to drop the exponentiation.  This closes SF bug #456756.
---

diff --git a/Python/compile.c b/Python/compile.c
index 1921220325b7..171fceb46ea4 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -1891,8 +1891,11 @@ com_factor(struct compiling *c, node *n)
 	   negative in the 0th position. 
 	 */
 	if ((childtype == PLUS || childtype == MINUS || childtype == TILDE)
+	    && NCH(n) == 2
 	    && TYPE(CHILD(n, 1)) == factor
+ 	    && NCH(CHILD(n, 1)) == 1
 	    && TYPE(CHILD(CHILD(n, 1), 0)) == power
+ 	    && NCH(CHILD(CHILD(n, 1), 0)) == 1
 	    && TYPE(CHILD(CHILD(CHILD(n, 1), 0), 0)) == atom
 	    && TYPE(CHILD(CHILD(CHILD(CHILD(n, 1), 0), 0), 0)) == NUMBER) {
 		node *constant = CHILD(CHILD(CHILD(n, 1), 0), 0);