Fix another Rust demangling bugs (PR 105039)

[Nick Clifton]

Hi Guys,

   Attached is a proposed patch to fix another Rust demangling bug
   reported in PR 105039.  I would like to say that this is the
   last time that we will see this problem for the Rust demangler,
   but I am not that naive...

   OK to apply ?

Cheers
   Nick
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