[tex-live] bug in etex

[Hans Hagen]

Hi Taco (since i think that you qualify for sorting this out -) and others,

Etex can have > 256 token registers. The following fails (bombs) on my machine (i cannot make atest file since it's part of a more complex piece of code) 

\toks260 has some content 
\toks262 is yet empty and never accessed 

failure : 

  \tokdeffed_262=\tokdeffed_260

failure (content copied, but later on bug and no content) : 

  \tokdeffed_262=\tokdeffed_260
  \tokdeffed_262=\tokdeffed_260

success (but empty destination register) 

  \toks262=\toks260 
  \tokdeffed_262=\tokdeffed_260

So, it looks like there is some problem with \toksdeffed things: \somename with meaning \toks262 is treated differently from the direct call and content is not copied; it may be related to the fact that those  >255 registers are implement differently (using main mem if i remember right) than the lower ones. 

The bug has a slightly random character (changing order/place). 

Hans 

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