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…szelmann distinguish "expected a single argument" and "expected an argument" on attribute parsing
…, r=JonathanBrouwer Use a linting node closer the parsing of `#[cfg_attr]` The parsing of `#[cfg_attr]` unconditionally used the crate-root as a linting node to attach lints, but the `unexpected_cfgs` lint can fire when parsing the attribute and users expect to be able to allow it at places other than the crate-root. Let's instead use the linting node id, which is unfortunately always the parent but that's better than the crate-root when you are in a sub-module. The parsing of `#[cfg]` and other already use the expansion linting node id, so no change required there. Related to rust-lang#155118
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#[cfg_attr]#155120 (Use a linting node closer the parsing of#[cfg_attr])r? @ghost
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