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TokenStream did not copy back enough old data to the new location. This commit also add more explicit memcpy usages in order to facilitate change to utf-8 later. libgrust/ChangeLog: * libproc_macro/ffistring.cc (FFIString::make_ffistring): Add explicit sizeof and utf-8 warning. (FFIString::clone): Add explicit sizeof and utf-8 warning. * libproc_macro/ident.cc (Ident::clone): Likewise. (Ident::make_ident): Likewise. * libproc_macro/tokenstream.cc (TokenStream::grow): Fix vector growth. (TokenStream__clone): Add explicit sizeof. Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>