From 5026cb4dc6477c81c465c8d0f3a1e6c5344d20c5 Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Fri, 25 Apr 1997 17:32:00 +0000
Subject: Now that the string-sig has settled on r"obin" strings, restrict the
 <letter><string> notation to 'r' and 'R'.

---
 Parser/tokenizer.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index 3bf0fee..9f26840 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -541,9 +541,13 @@ tok_get(tok, p_start, p_end)
 	
 	/* Identifier (most frequent token!) */
 	if (isalpha(c) || c == '_') {
-		c = tok_nextc(tok);
-		if (c == '"' || c == '\'')
-			goto letter_quote;
+		switch (c) {
+		case 'r':
+		case 'R':
+			c = tok_nextc(tok);
+			if (c == '"' || c == '\'')
+				goto letter_quote;
+		}
 		while (isalnum(c) || c == '_') {
 			c = tok_nextc(tok);
 		}
-- 
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