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The function to get a literal from a string missed an implementation. It did require a conversion function to achieve it, now that callback system has been merged this function can be easily implemented. gcc/rust/ChangeLog: * expand/rust-proc-macro.cc (literal_from_string): Add callback function. (load_macros_array): Likewise. libgrust/ChangeLog: * libproc_macro/literal.cc (Literal__from_string): Add implementation with call to constructor. (Literal::make_literal): Add new constructor which calls the callback. * libproc_macro/literal.h: Add new constructor's prototype. * libproc_macro/proc_macro.cc (bridge_is_available): Change symbol name to match convention. * libproc_macro/registration.h: Add lit_from_str symbol. * libproc_macro/tokenstream.cc (TokenStream::make_tokenstream): Change symbol name to disambiguate with literal from string. Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>