diff --git a/ChangeLog b/ChangeLog
index dedd118073..4f94160667 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Mar 21 23:23:45 2003  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* regex.c (re_compile_pattern): give warning for unescaped square
+	  brackets and minus in character class. [ruby-dev:19868]
+
 Fri Mar 21 18:12:20 2003  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
 
 	* eval.c (bmcall): missing type.
diff --git a/eval.c b/eval.c
index 7fa1261af1..9c5dcb8659 100644
--- a/eval.c
+++ b/eval.c
@@ -7284,8 +7284,10 @@ static VALUE
 bmcall(args, method)
     VALUE args, method;
 {
-    volatile VALUE args2 = svalue_to_avalue(args);
-    return method_call(RARRAY(args2)->len, RARRAY(args2)->ptr, method);
+    volatile VALUE a;
+
+    a = svalue_to_avalue(args);
+    return method_call(RARRAY(a)->len, RARRAY(a)->ptr, method);
 }
 
 static VALUE
diff --git a/regex.c b/regex.c
index 9ea73dac4c..7ae16cf121 100644
--- a/regex.c
+++ b/regex.c
@@ -185,6 +185,11 @@ static int current_mbctype = MBCTYPE_ASCII;
 
 #ifdef RUBY
 #include "util.h"
+# re_warning(x) rb_warn(x)
+#endif
+
+#ifndef re_warning
+# define re_warning(x)
 #endif
 
 static void
@@ -1464,6 +1469,7 @@ re_compile_pattern(pattern, size, bufp)
 	  if (p == p0 + 1) {
 	    if (p == pend)
 	      FREE_AND_RETURN(stackb, "invalid regular expression; empty character class");
+            re_warning("character class has `]' without escape");
 	  }
 	  else 
 	    /* Stop if this isn't merely a ] inside a bracket
@@ -1481,6 +1487,9 @@ re_compile_pattern(pattern, size, bufp)
 	}
 	had_char_class = 0;
 
+	if (c == '-')
+          re_warning("character class has `-' without escape");
+
 	/* \ escapes characters when inside [...].  */
 	if (c == '\\') {
 	  PATFETCH_RAW(c);
@@ -1678,6 +1687,7 @@ re_compile_pattern(pattern, size, bufp)
 	    c1++;
 	    while (c1--)    
 	      PATUNFETCH;
+            re_warning("character class has `[' without escape");
 	    SET_LIST_BIT(TRANSLATE_P()?translate['[']:'[');
 	    SET_LIST_BIT(TRANSLATE_P()?translate[':']:':');
 	    had_char_class = 0;
@@ -1685,6 +1695,8 @@ re_compile_pattern(pattern, size, bufp)
 	  }
 	}
 	else if (had_mbchar == 0 && (!current_mbctype || !had_num_literal)) {
+          if (c == '[')
+            re_warning("character class has `[' without escape");
 	  SET_LIST_BIT(c);
  	  had_num_literal = 0;
 	}