* complex.c: uses f_(in)?exact_p macro.

* rational.c: ditto.

	* bignum.c (rb_big_pow): bignum**bignum - should calculate without
	  rational.

	* lib/complex.rb: should override Math module at most once.

	* lib/mathn.rb: requires 'cmath' directly.

-この行以下は無視されます --

M    complex.c
M    ChangeLog
M    lib/mathn.rb
M    lib/complex.rb
M    bignum.c
M    rational.c


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@19431 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/complex.rb

@@ -1,7 +1,9 @@
 require 'cmath'
 
-Object.instance_eval{remove_const :Math}
-Math = CMath
+unless defined?(Math.exp!)
+  Object.instance_eval{remove_const :Math}
+  Math = CMath
+end
 
 def Complex.generic? (other)
   other.kind_of?(Integer) ||