added subscripting to fixnums

spec/tags/core/fixnum/element_reference_tags.txt

@@ -1,12 +1,2 @@
-fails:Fixnum#[] returns 1 if the nth bit is set
-fails:Fixnum#[] returns 0 if the nth bit is not set
-fails:Fixnum#[] returns 0 if the nth bit is greater than the most significant bit
-fails:Fixnum#[] returns 0 when passed a negative argument
-fails:Fixnum#[] calls #to_int to convert the argument to an Integer and returns 1 if the nth bit is set
-fails:Fixnum#[] calls #to_int to convert the argument to an Integer and returns 0 if the nth bit is set
-fails:Fixnum#[] accepts a Float argument and returns 0 if the bit at the truncated value is not set
-fails:Fixnum#[] accepts a Float argument and returns 1 if the bit at the truncated value is set
-fails:Fixnum#[] raises a TypeError when passed a String
-fails:Fixnum#[] raises a TypeError when #to_int does not return an Integer
 fails:Fixnum#[] calls #to_int to coerce a String to a Bignum and returns 0
 fails:Fixnum#[] returns 0 when passed a Float in the range of a Bignum

topaz/objects/intobject.py

@@ -294,3 +294,9 @@ def method_chr(self, space):
             raise space.error(space.w_RangeError, "%d out of char range" % self.intvalue)
         else:
             return space.newstr_fromstr(chr(self.intvalue))
+
+    @classdef.method("[]", idx="int")
+    def method_subscript(self, space, idx):
+        if not 0 <= idx < LONG_BIT:
+            return space.newint(0)
+        return space.newint(int(bool(self.intvalue & (1 << idx))))