oO compare the output of this program when running normally and with Miri: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=e138c2cf2dbc6c36912b575c04bf2643
@oli seems like somehow filling does not work when running in Miri?
somehow passing the formatting information (the width, in this case) does not work. that's some awful unsafe code if I recall correctly...
uuhhh... I got it
self.formatter as usize == ArgumentV1::show_usize as usize
this code compares function pointers
and relies on stable addresses
Something will go horribly wrong in const eval and pointer comparison code some day