"detects proc macro derives using inaccessible names from parent modules"
}
+declare_lint! {
+ pub MACRO_USE_EXTERN_CRATE,
+ Allow,
+ "the `#[macro_use]` attribute is now deprecated in favor of using macros \
+ via the module system"
+}
+
/// Does nothing as a lint pass, but registers some `Lint`s
/// which are used by other parts of the compiler.
#[derive(Copy, Clone)]
INTRA_DOC_LINK_RESOLUTION_FAILURE,
WHERE_CLAUSES_OBJECT_SAFETY,
PROC_MACRO_DERIVE_RESOLUTION_FALLBACK,
+ MACRO_USE_EXTERN_CRATE,
)
}
}
use rustc::lint;
use rustc::lint::{LateContext, LateLintPass, LintPass, LintArray};
use rustc::lint::builtin::{BARE_TRAIT_OBJECTS, ABSOLUTE_PATHS_NOT_STARTING_WITH_CRATE};
+use rustc::lint::builtin::MACRO_USE_EXTERN_CRATE;
use rustc::session;
use rustc::util;
use rustc::hir;
BARE_TRAIT_OBJECTS,
UNREACHABLE_PUB,
UNUSED_EXTERN_CRATES,
+ MACRO_USE_EXTERN_CRATE,
ELLIPSIS_INCLUSIVE_RANGE_PATTERNS);
// Guidelines for creating a future incompatibility lint:
match directive.subclass {
_ if directive.used.get() ||
directive.vis.get() == ty::Visibility::Public ||
- directive.span.is_dummy() => {}
+ directive.span.is_dummy() => {
+ if let ImportDirectiveSubclass::MacroUse = directive.subclass {
+ if resolver.session.features_untracked().use_extern_macros &&
+ !directive.span.is_dummy() {
+ resolver.session.buffer_lint(
+ lint::builtin::MACRO_USE_EXTERN_CRATE,
+ directive.id,
+ directive.span,
+ "deprecated `#[macro_use]` directive used to \
+ import macros should be replaced at use sites \
+ with a `use` statement to import the macro \
+ instead",
+ );
+ }
+ }
+ }
ImportDirectiveSubclass::ExternCrate(_) => {
resolver.maybe_unused_extern_crates.push((directive.id, directive.span));
}
--- /dev/null
+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[macro_export]
+macro_rules! foo { () => () }
--- /dev/null
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
--- /dev/null
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// aux-build:macro-use-warned-against.rs
+// aux-build:macro-use-warned-against2.rs
+// compile-pass
+
+#![warn(rust_2018_idioms, unused)]
+#![feature(use_extern_macros)]
+
+#[macro_use] //~ WARN should be replaced at use sites with a `use` statement
+extern crate macro_use_warned_against;
+#[macro_use] //~ WARN unused `#[macro_use]`
+extern crate macro_use_warned_against2;
+
+fn main() {
+ foo!();
+}
--- /dev/null
+warning: deprecated `#[macro_use]` directive used to import macros should be replaced at use sites with a `use` statement to import the macro instead
+ --> $DIR/macro-use-warned-against.rs:18:1
+ |
+LL | #[macro_use] //~ WARN should be replaced at use sites with a `use` statement
+ | ^^^^^^^^^^^^
+ |
+note: lint level defined here
+ --> $DIR/macro-use-warned-against.rs:15:9
+ |
+LL | #![warn(rust_2018_idioms, unused)]
+ | ^^^^^^^^^^^^^^^^
+ = note: #[warn(macro_use_extern_crate)] implied by #[warn(rust_2018_idioms)]
+
+warning: unused `#[macro_use]` import
+ --> $DIR/macro-use-warned-against.rs:20:1
+ |
+LL | #[macro_use] //~ WARN unused `#[macro_use]`
+ | ^^^^^^^^^^^^
+ |
+note: lint level defined here
+ --> $DIR/macro-use-warned-against.rs:15:27
+ |
+LL | #![warn(rust_2018_idioms, unused)]
+ | ^^^^^^
+ = note: #[warn(unused_imports)] implied by #[warn(unused)]
+