Do not lint for wildcard_imports in external macro (#15413)

Fixes #15412

changelog: [`wildcard_imports`]: do not lint code coming from an
external macro

Author: blyxyas

clippy_lints/src/wildcard_imports.rs

@@ -118,7 +118,7 @@ impl_lint_pass!(WildcardImports => [ENUM_GLOB_USE, WILDCARD_IMPORTS]);
 
 impl LateLintPass<'_> for WildcardImports {
     fn check_item(&mut self, cx: &LateContext<'_>, item: &Item<'_>) {
-        if cx.sess().is_test_crate() {
+        if cx.sess().is_test_crate() || item.span.in_external_macro(cx.sess().source_map()) {
             return;
         }
 

tests/ui-toml/wildcard_imports/wildcard_imports.fixed

@@ -1,3 +1,4 @@
+//@aux-build:../../ui/auxiliary/proc_macros.rs
 #![warn(clippy::wildcard_imports)]
 
 mod prelude {
@@ -13,6 +14,10 @@ mod my_crate {
     pub mod utils {
         pub fn my_util_fn() {}
     }
+
+    pub mod utils2 {
+        pub const SOME_CONST: u32 = 1;
+    }
 }
 
 pub use utils::{BAR, print};
@@ -22,6 +27,12 @@ use my_crate::utils::my_util_fn;
 use prelude::FOO;
 //~^ ERROR: usage of wildcard import
 
+proc_macros::external! {
+    use my_crate::utils2::*;
+
+    static SOME_STATIC: u32 = SOME_CONST;
+}
+
 fn main() {
     let _ = FOO;
     let _ = BAR;

tests/ui-toml/wildcard_imports/wildcard_imports.rs

@@ -1,3 +1,4 @@
+//@aux-build:../../ui/auxiliary/proc_macros.rs
 #![warn(clippy::wildcard_imports)]
 
 mod prelude {
@@ -13,6 +14,10 @@ mod my_crate {
     pub mod utils {
         pub fn my_util_fn() {}
     }
+
+    pub mod utils2 {
+        pub const SOME_CONST: u32 = 1;
+    }
 }
 
 pub use utils::*;
@@ -22,6 +27,12 @@ use my_crate::utils::*;
 use prelude::*;
 //~^ ERROR: usage of wildcard import
 
+proc_macros::external! {
+    use my_crate::utils2::*;
+
+    static SOME_STATIC: u32 = SOME_CONST;
+}
+
 fn main() {
     let _ = FOO;
     let _ = BAR;

tests/ui-toml/wildcard_imports/wildcard_imports.stderr

@@ -1,5 +1,5 @@
 error: usage of wildcard import
-  --> tests/ui-toml/wildcard_imports/wildcard_imports.rs:18:9
+  --> tests/ui-toml/wildcard_imports/wildcard_imports.rs:23:9
    |
 LL | pub use utils::*;
    |         ^^^^^^^^ help: try: `utils::{BAR, print}`
@@ -8,13 +8,13 @@ LL | pub use utils::*;
    = help: to override `-D warnings` add `#[allow(clippy::wildcard_imports)]`
 
 error: usage of wildcard import
-  --> tests/ui-toml/wildcard_imports/wildcard_imports.rs:20:5
+  --> tests/ui-toml/wildcard_imports/wildcard_imports.rs:25:5
    |
 LL | use my_crate::utils::*;
    |     ^^^^^^^^^^^^^^^^^^ help: try: `my_crate::utils::my_util_fn`
 
 error: usage of wildcard import
-  --> tests/ui-toml/wildcard_imports/wildcard_imports.rs:22:5
+  --> tests/ui-toml/wildcard_imports/wildcard_imports.rs:27:5
    |
 LL | use prelude::*;
    |     ^^^^^^^^^^ help: try: `prelude::FOO`