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Backport #2057
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Strange behavior IO#ungetc at the beginning of the stream
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Description
=begin
Issue cloned from #1909.
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This works:
io = File.open("a.txt", "r+")
io.read(0)
p io.pos # => 0
io.ungetc(100)
p io.pos # => 0
while this doesn't:
io = File.open("a.txt", "r+")
p io.pos # => 0
io.ungetc(100) # => unread stream (IOError)
I would expect the first case to raise the same error as the second one since ungetc is supposed to shift the position back by 1 and we are at the beginning of the stream.
In ruby 1.9.1p129 (2009-05-12 revision 23412) [i386-mswin32] neither case raises an exception, which is at least consistent but still weird.
=end
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