From: "twooster (Tony Wooster)" <twooster@...>
Date: 2012-09-22T00:26:09+09:00
Subject: [ruby-core:47632] [ruby-trunk - Bug #7044][Open] BigDecimal#power randomly raises coercion errors


Issue #7044 has been reported by twooster (Tony Wooster).

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Bug #7044: BigDecimal#power randomly raises coercion errors
https://bugs.ruby-lang.org/issues/7044

Author: twooster (Tony Wooster)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux]


When running the following code:

    require 'bigdecimal'

    10000.times { BigDecimal.new('1001.10')**0.75; putc '.' }

The call to ** will sometimes (not always) raise the following trace:

    ..............................................TypeError: #<Class:0x0000001cd78f40> can't be coerced into BigDecimal
    	from (irb):4:in `**'
    	from (irb):4:in `block in irb_binding'
    	from (irb):3:in `times'
    	from (irb):3
    	from /home/tony/.rbenv/versions/1.9.3-p194/bin/irb:12:in `<main>'

(The '.'s being the debug print of the putc.) I understand the documentation says only integer powers are supported for BigDecimal, however there is code support for floats and rationals, and it should fail or work reliably either way.



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