file /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447/src/libcore/num/mod.rs does not exist!
file /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447/src/libcore/slice/mod.rs does not exist!
is this is an expected behavior?
Linux
rustc 1.42.0 (b8cedc004 2020-03-09) installed via rustup
is this is an expected behavior?