Denying print_stdout lint in src/lib.rs does not catch println!()s in modules

[jszwedko]

Lint name: print_stdout

I might be misunderstanding something, but usually I put lints in src/lib.rs to deny them for all modules. This works for other lints, but seems to not work for the print_stdout lint?

I tried this code:

https://gist.github.com/jszwedko/59e2fad1a7d4e0c36b96a802a99e25fc

I expected to see this happen: clippy output a warning for the println!() in src/foo/mod.rs

Instead, this happened: clippy did not output any warnings.

Meta

Rust version (rustc -Vv):

rustc 1.56.1 (59eed8a2a 2021-11-01)
binary: rustc
commit-hash: 59eed8a2aac0230a8b53e89d4e99d55912ba6b35
commit-date: 2021-11-01
host: x86_64-apple-darwin
release: 1.56.1
LLVM version: 13.0.0

[flip1995]

Duplicate of #6610

This is because the print_stdout is a pre-expansion pass lint. We have to get rid of those lints at some point. The challenge with that is, that we have to rewrite those lints before we can do that.