Rollup merge of #73300 - crlf0710:crate_level_only_check, r=petrochenkov

Implement crate-level-only lints checking.

This implements a crate_level_only flag on lints, and when it is true, it becomes an error when user tries  to specify this flag upon nodes other than crate node.

This also turns on this flag for all non_ascii_ident lints.

3 files changed, 85 insertions, 1 deletions

diff --git a/src/test/ui/issues/issue-48508.rs b/src/test/ui/issues/issue-48508.rs
index 87965c204ad..8dc9351260e 100644
--- a/src/test/ui/issues/issue-48508.rs
+++ b/src/test/ui/issues/issue-48508.rs
@@ -11,7 +11,7 @@
 // ignore-asmjs wasm2js does not support source maps yet
 
 #![feature(non_ascii_idents)]
-#[allow(uncommon_codepoints)]
+#![allow(uncommon_codepoints)]
 
 #[path = "issue-48508-aux.rs"]
 mod other_file;
diff --git a/src/test/ui/lint/crate_level_only_lint.rs b/src/test/ui/lint/crate_level_only_lint.rs
new file mode 100644
index 00000000000..d9673faa214
--- /dev/null
+++ b/src/test/ui/lint/crate_level_only_lint.rs
@@ -0,0 +1,22 @@
+#![deny(uncommon_codepoints, unused_attributes)]
+
+mod foo {
+#![allow(uncommon_codepoints)]
+//~^ ERROR allow(uncommon_codepoints) is ignored unless specified at crate level [unused_attributes]
+//~| ERROR allow(uncommon_codepoints) is ignored unless specified at crate level [unused_attributes]
+//~| ERROR allow(uncommon_codepoints) is ignored unless specified at crate level [unused_attributes]
+
+#[allow(uncommon_codepoints)]
+//~^ ERROR allow(uncommon_codepoints) is ignored unless specified at crate level [unused_attributes]
+//~| ERROR allow(uncommon_codepoints) is ignored unless specified at crate level [unused_attributes]
+//~| ERROR allow(uncommon_codepoints) is ignored unless specified at crate level [unused_attributes]
+const BAR: f64 = 0.000001;
+
+}
+
+#[allow(uncommon_codepoints)]
+//~^ ERROR allow(uncommon_codepoints) is ignored unless specified at crate level [unused_attributes]
+//~| ERROR allow(uncommon_codepoints) is ignored unless specified at crate level [unused_attributes]
+//~| ERROR allow(uncommon_codepoints) is ignored unless specified at crate level [unused_attributes]
+fn main() {
+}
diff --git a/src/test/ui/lint/crate_level_only_lint.stderr b/src/test/ui/lint/crate_level_only_lint.stderr
new file mode 100644
index 00000000000..8fb06df2a48
--- /dev/null
+++ b/src/test/ui/lint/crate_level_only_lint.stderr
@@ -0,0 +1,62 @@
+error: allow(uncommon_codepoints) is ignored unless specified at crate level
+  --> $DIR/crate_level_only_lint.rs:4:10
+   |
+LL | #![allow(uncommon_codepoints)]
+   |          ^^^^^^^^^^^^^^^^^^^
+   |
+note: the lint level is defined here
+  --> $DIR/crate_level_only_lint.rs:1:30
+   |
+LL | #![deny(uncommon_codepoints, unused_attributes)]
+   |                              ^^^^^^^^^^^^^^^^^
+
+error: allow(uncommon_codepoints) is ignored unless specified at crate level
+  --> $DIR/crate_level_only_lint.rs:9:9
+   |
+LL | #[allow(uncommon_codepoints)]
+   |         ^^^^^^^^^^^^^^^^^^^
+
+error: allow(uncommon_codepoints) is ignored unless specified at crate level
+  --> $DIR/crate_level_only_lint.rs:17:9
+   |
+LL | #[allow(uncommon_codepoints)]
+   |         ^^^^^^^^^^^^^^^^^^^
+
+error: allow(uncommon_codepoints) is ignored unless specified at crate level
+  --> $DIR/crate_level_only_lint.rs:4:10
+   |
+LL | #![allow(uncommon_codepoints)]
+   |          ^^^^^^^^^^^^^^^^^^^
+
+error: allow(uncommon_codepoints) is ignored unless specified at crate level
+  --> $DIR/crate_level_only_lint.rs:9:9
+   |
+LL | #[allow(uncommon_codepoints)]
+   |         ^^^^^^^^^^^^^^^^^^^
+
+error: allow(uncommon_codepoints) is ignored unless specified at crate level
+  --> $DIR/crate_level_only_lint.rs:17:9
+   |
+LL | #[allow(uncommon_codepoints)]
+   |         ^^^^^^^^^^^^^^^^^^^
+
+error: allow(uncommon_codepoints) is ignored unless specified at crate level
+  --> $DIR/crate_level_only_lint.rs:4:10
+   |
+LL | #![allow(uncommon_codepoints)]
+   |          ^^^^^^^^^^^^^^^^^^^
+
+error: allow(uncommon_codepoints) is ignored unless specified at crate level
+  --> $DIR/crate_level_only_lint.rs:9:9
+   |
+LL | #[allow(uncommon_codepoints)]
+   |         ^^^^^^^^^^^^^^^^^^^
+
+error: allow(uncommon_codepoints) is ignored unless specified at crate level
+  --> $DIR/crate_level_only_lint.rs:17:9
+   |
+LL | #[allow(uncommon_codepoints)]
+   |         ^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 9 previous errors
+