Spurious libtest.rmeta file generated

[leonardo-m]

If I compile a simple program like:

fn main() {
    println!("Hello world");
}

Using:

rustc --emit=metadata test.rs

It generates an empty file titled "libtest.rmeta" since few Nightlies.

I am using:

rustc 1.27.0-nightly (7f3444e1b 2018-04-26)
binary: rustc
commit-hash: 7f3444e1baf0d335b4bf379f845dbc28cdd0509c
commit-date: 2018-04-26
host: x86_64-pc-windows-gnu
release: 1.27.0-nightly
LLVM version: 6.0

[ehuss]

I think this is a consequence of #49289.

[ishitatsuyuki]

I think this is the intended behaviour. What do you expect otherwise?

[leonardo-m]

Can I use Rustc to just test the types of a program without generating extra files?

[Mark-Simulacrum]

I don't think we're inclined to support this sort of "check without emitting files" today so I'm going to go ahead and close. If someone wants this, I think a PR would not be too difficult to implement, maybe via --emit=none or something like that. Bikeshed on the naming, of course.