#[cfg(...)] ignores namespace #53489
Description
Repro:
fn main() { println!(" cfg(a) = {}", cfg!(a)); println!("cfg(something::a) = {}", cfg!(something::a)); }$ rustc --cfg 'a' 1.rs && ./1 cfg(a) = true cfg(something::a) = true $ rustc --cfg 'something::a' 1.rs && ./1 cfg(a) = true cfg(something::a) = true $ rustc --cfg 'what::a' 1.rs && ./1 cfg(a) = true cfg(something::a) = truewhile I expected these should print true/false, false/true and false/false instead.
(Note: this also affects --print cfg which something::a is collapsed to a)
$ rustc -vV rustc 1.30.0-nightly (33b923fd4 2018-08-18) binary: rustc commit-hash: 33b923fd44c5c5925e635815fce68bdf1f98740f commit-date: 2018-08-18 host: x86_64-apple-darwin release: 1.30.0-nightly LLVM version: 7.0