wildcard_imports: lint on pub use if asked to

`warn_on_all_wildcard_imports` should warn on all wildcard imports,
including the reexported ones.

Author: samueltardieu

book/src/lint_configuration.md

@@ -1030,7 +1030,8 @@ The maximum allowed size of a bit mask before suggesting to use 'trailing_zeros'
 
 
 ## `warn-on-all-wildcard-imports`
-Whether to allow certain wildcard imports (prelude, super in tests).
+Whether to emit warnings on all wildcard imports, including those from `prelude`, from `super` in tests,
+or for `pub use` reexports.
 
 **Default Value:** `false`
 

clippy_config/src/conf.rs

@@ -737,7 +737,8 @@ define_Conf! {
     /// The maximum allowed size of a bit mask before suggesting to use 'trailing_zeros'
     #[lints(verbose_bit_mask)]
     verbose_bit_mask_threshold: u64 = 1,
-    /// Whether to allow certain wildcard imports (prelude, super in tests).
+    /// Whether to emit warnings on all wildcard imports, including those from `prelude`, from `super` in tests,
+    /// or for `pub use` reexports.
     #[lints(wildcard_imports)]
     warn_on_all_wildcard_imports: bool = false,
     /// Whether to also emit warnings for unsafe blocks with metavariable expansions in **private** macros.

clippy_lints/src/wildcard_imports.rs

@@ -68,6 +68,8 @@ declare_clippy_lint! {
     /// (including the standard library) provide modules named "prelude" specifically designed
     /// for wildcard import.
     ///
+    /// Wildcard imports reexported through `pub use` are also allowed.
+    ///
     /// `use super::*` is allowed in test modules. This is defined as any module with "test" in the name.
     ///
     /// These exceptions can be disabled using the `warn-on-all-wildcard-imports` configuration flag.
@@ -121,7 +123,9 @@ impl LateLintPass<'_> for WildcardImports {
         }
 
         let module = cx.tcx.parent_module_from_def_id(item.owner_id.def_id);
-        if cx.tcx.visibility(item.owner_id.def_id) != ty::Visibility::Restricted(module.to_def_id()) {
+        if cx.tcx.visibility(item.owner_id.def_id) != ty::Visibility::Restricted(module.to_def_id())
+            && !self.warn_on_all
+        {
             return;
         }
         if let ItemKind::Use(use_path, UseKind::Glob) = &item.kind

tests/ui-toml/wildcard_imports/wildcard_imports.fixed

@@ -15,7 +15,7 @@ mod my_crate {
     }
 }
 
-use utils::{BAR, print};
+pub use utils::{BAR, print};
 //~^ ERROR: usage of wildcard import
 use my_crate::utils::my_util_fn;
 //~^ ERROR: usage of wildcard import

tests/ui-toml/wildcard_imports/wildcard_imports.rs

@@ -15,7 +15,7 @@ mod my_crate {
     }
 }
 
-use utils::*;
+pub use utils::*;
 //~^ ERROR: usage of wildcard import
 use my_crate::utils::*;
 //~^ ERROR: usage of wildcard import

tests/ui-toml/wildcard_imports/wildcard_imports.stderr

@@ -1,8 +1,8 @@
 error: usage of wildcard import
-  --> tests/ui-toml/wildcard_imports/wildcard_imports.rs:18:5
+  --> tests/ui-toml/wildcard_imports/wildcard_imports.rs:18:9
    |
-LL | use utils::*;
-   |     ^^^^^^^^ help: try: `utils::{BAR, print}`
+LL | pub use utils::*;
+   |         ^^^^^^^^ help: try: `utils::{BAR, print}`
    |
    = note: `-D clippy::wildcard-imports` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::wildcard_imports)]`