[project @ 2003-10-06 13:14:36 by simonpj]

MERGE TO STABLE

Fix trivial lexing bug involving leading zeros
	045.4
was lexing as an Int, with a trailing ".4"

The test is lib/Lex/lexNum

diff --git a/Text/Read/Lex.hs b/Text/Read/Lex.hs
index 5273c4f..dda2859 100644 (file)
--- a/Text/Read/Lex.hs
+++ b/Text/Read/Lex.hs
@@ -188,7 +188,7 @@ lexCharE =
          _    -> pfail
   
   lexNumeric =
-    do base <- lexBaseChar
+    do base <- lexBaseChar <++ return 10
        n    <- lexInteger base
        guard (n <= toInteger (ord maxBound))
        return (chr (fromInteger n))
@@ -319,12 +319,9 @@ lexHexOct
        return (Int (val (fromIntegral base) 0 digits))
 
 lexBaseChar :: ReadP Int
--- Lex a single character indicating the base, 
--- or return 10 if there isn't one
-lexBaseChar = lex_base <++ return 10
-   where
-      lex_base = do { c <- get;
-                     case c of
+-- Lex a single character indicating the base; fail if not there
+lexBaseChar = do { c <- get;
+                  case c of
                        'o' -> return 8
                        'O' -> return 8
                        'x' -> return 16