[Bug c++/103827] function which takes an argument via (hidden) reference should assume the argument does not escape or is only read from

[hubicka at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103827

--- Comment #9 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Jason, did you intend to close this as invalid?  I think we agreed on the
original testcase being valid - we can assume that calls to
extern void foo (const std::string );
can assume the string argument being unchanged by foo.