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resolve: Mark extern crate items as used in more cases

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This commit is contained in:
Vadim Petrochenkov 2019-01-13 00:58:45 +03:00
parent d6525ef539
commit 6aa7856369
3 changed files with 69 additions and 0 deletions
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3
src/librustc_resolve/lib.rs
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@ -5089,6 +5089,9 @@ impl<'a> Resolver<'a> {
}
self.extern_prelude.get(&ident.modern()).cloned().and_then(|entry| {
if let Some(binding) = entry.extern_crate_item {
if !speculative && entry.introduced_by_item {
self.record_use(ident, TypeNS, binding, false);
}
Some(binding)
} else {
let crate_id = if !speculative {

28
src/test/ui/imports/extern-crate-used.rs Normal file
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@ -0,0 +1,28 @@
// Extern crate items are marked as used if they are used
// through extern prelude entries introduced by them.
// edition:2018
#![deny(unused_extern_crates)]
extern crate core as iso1; //~ ERROR `extern crate` is not idiomatic in the new edition
extern crate core as iso2; //~ ERROR `extern crate` is not idiomatic in the new edition
extern crate core as iso3; //~ ERROR `extern crate` is not idiomatic in the new edition
extern crate core as iso4; //~ ERROR `extern crate` is not idiomatic in the new edition
// Doesn't introduce its extern prelude entry, so it's still considered unused.
extern crate core; //~ ERROR unused extern crate
mod m {
use iso1::any as are_you_okay1;
use ::iso2::any as are_you_okay2;
type AreYouOkay1 = iso3::any::Any;
type AreYouOkay2 = ::iso4::any::Any;
use core::any as are_you_okay3;
use ::core::any as are_you_okay4;
type AreYouOkay3 = core::any::Any;
type AreYouOkay4 = ::core::any::Any;
}
fn main() {}

38
src/test/ui/imports/extern-crate-used.stderr Normal file
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@ -0,0 +1,38 @@
error: `extern crate` is not idiomatic in the new edition
--> $DIR/extern-crate-used.rs:8:1
|
LL | extern crate core as iso1; //~ ERROR `extern crate` is not idiomatic in the new edition
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert it to a `use`
|
note: lint level defined here
--> $DIR/extern-crate-used.rs:6:9
|
LL | #![deny(unused_extern_crates)]
| ^^^^^^^^^^^^^^^^^^^^
error: `extern crate` is not idiomatic in the new edition
--> $DIR/extern-crate-used.rs:9:1
|
LL | extern crate core as iso2; //~ ERROR `extern crate` is not idiomatic in the new edition
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert it to a `use`
error: `extern crate` is not idiomatic in the new edition
--> $DIR/extern-crate-used.rs:10:1
|
LL | extern crate core as iso3; //~ ERROR `extern crate` is not idiomatic in the new edition
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert it to a `use`
error: `extern crate` is not idiomatic in the new edition
--> $DIR/extern-crate-used.rs:11:1
|
LL | extern crate core as iso4; //~ ERROR `extern crate` is not idiomatic in the new edition
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert it to a `use`
error: unused extern crate
--> $DIR/extern-crate-used.rs:14:1
|
LL | extern crate core; //~ ERROR unused extern crate
| ^^^^^^^^^^^^^^^^^^ help: remove it
error: aborting due to 5 previous errors