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diff --git a/handy.h b/handy.h
index ee4d668..ad2e4b6 100644 (file)
--- a/handy.h
+++ b/handy.h
@@ -640,6 +640,8 @@ EXTCONST U32 PL_charclass[];
 #   define isUPPER_A(c)  cBOOL(FITS_IN_8_BITS(c) && (PL_charclass[(U8) NATIVE_TO_UNI(c)] & _CC_UPPER_A))
 #   define isWORDCHAR_A(c) cBOOL(FITS_IN_8_BITS(c) && (PL_charclass[(U8) NATIVE_TO_UNI(c)] & _CC_WORDCHAR_A))
 #   define isXDIGIT_A(c)  cBOOL(FITS_IN_8_BITS(c) && (PL_charclass[(U8) NATIVE_TO_UNI(c)] & _CC_XDIGIT_A))
+    /* Either participates in a fold with a character above 255, or is a
+     * multi-char fold */
 #   define _HAS_NONLATIN1_FOLD_CLOSURE_ONLY_FOR_USE_BY_REGCOMP_DOT_C_AND_REGEXEC_DOT_C(c) ((! cBOOL(FITS_IN_8_BITS(c))) || (PL_charclass[(U8) NATIVE_TO_UNI(c)] & _CC_NONLATIN1_FOLD))
 #else   /* No perl.h. */
 #   define isOCTAL_A(c)  ((c) >= '0' && (c) <= '9')

diff --git a/regcomp.c b/regcomp.c
index 3531961..29d5fda 100644 (file)
--- a/regcomp.c
+++ b/regcomp.c
@@ -9902,6 +9902,11 @@ parseit:
        invlist_destroy(nonbitmap);
     }
 
+    /* Here, we have calculated what code points should be in the character
+     * class.   Now we can see about various optimizations.  Fold calculation
+     * needs to take place before inversion.  Otherwise /[^k]/i would invert to
+     * include K, which under /i would match k. */
+
     /* Optimize inverted simple patterns (e.g. [^a-z]).  Note that we haven't
      * set the FOLD flag yet, so this this does optimize those.  It doesn't
      * optimize locale.  Doing so perhaps could be done as long as there is