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Rollup merge of #91313 - petrochenkov:cratexp, r=Aaron1011

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expand: Turn `ast::Crate` into a first class expansion target

And stop creating a fake `mod` item for the crate root when expanding a crate, thus addressing FIXMEs left in https://github.com/rust-lang/rust/pull/82238, and making a step towards a proper support for crate-level macro attributes (cc #54726).

I haven't added token collection support for the whole crate in this PR, maybe later.
r? `@Aaron1011`
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Matthias Krüger 2021-12-01 20:57:43 +01:00 • committed by GitHub
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20 changed files with 203 additions and 159 deletions
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src/test/ui/proc-macro/crate-attrs-multiple.rs Normal file
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// Multiple custom crate-level attributes, both inert and active.
// check-pass
// aux-crate:test_macros=test-macros.rs
#![feature(custom_inner_attributes)]
#![feature(prelude_import)]
#![test_macros::identity_attr]
#![rustfmt::skip]
#![test_macros::identity_attr]
#![rustfmt::skip]
fn main() {}

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src/test/ui/proc-macro/issue-59191-replace-root-with-fn.rs
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// edition:2018
// aux-crate:issue_59191=issue-59191.rs
// Test that using a macro to replace the entire crate tree with a non-'mod' item errors out nicely.
// `issue_59191::no_main` replaces whatever's passed in with `fn main() {}`.
// edition:2018
// aux-crate:issue_59191=issue-59191.rs
// error-pattern: requires `sized` lang_item
#![feature(custom_inner_attributes)]
#![issue_59191::no_main]
//~^ ERROR expected crate top-level item to be a module after macro expansion, found a function
#![issue_59191::no_main]

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error: expected crate top-level item to be a module after macro expansion, found a function
--> $DIR/issue-59191-replace-root-with-fn.rs:6:1
|
LL | #![issue_59191::no_main]
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: this error originates in the attribute macro `issue_59191::no_main` (in Nightly builds, run with -Z macro-backtrace for more info)
error: requires `sized` lang_item
error: aborting due to previous error