Add tests for issues 152004, 151124 and 152347

(cherry picked from commit 0cd0840243)

tests/ui/imports/overwrite-different-vis-2.rs

@@ -0,0 +1,17 @@
+// Regression test for issue #152347.
+
+//@ edition: 2018..
+
+use outer::*; // must be before `mod outer`
+mod outer {
+    mod inner {
+        pub fn f() {}
+    }
+
+    use inner::*;
+    pub use inner::*;
+}
+
+fn main() {
+    f(); //~ ERROR cannot find function `f` in this scope
+}

tests/ui/imports/overwrite-different-vis-2.stderr

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+error[E0425]: cannot find function `f` in this scope
+  --> $DIR/overwrite-different-vis-2.rs:16:5
+   |
+LL |     f();
+   |     ^ not found in this scope
+   |
+help: consider importing this function through its public re-export
+   |
+LL + use crate::outer::f;
+   |
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0425`.

tests/ui/imports/overwrite-vis-unused.rs

@@ -0,0 +1,12 @@
+// Regression test for issues #152004 and #151124.
+
+#![deny(unused)]
+
+mod m {
+    pub struct S {}
+}
+
+use m::*;
+pub use m::*; //~ ERROR unused import: `m::*`
+
+fn main() {}

tests/ui/imports/overwrite-vis-unused.stderr

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+error: unused import: `m::*`
+  --> $DIR/overwrite-vis-unused.rs:10:9
+   |
+LL | pub use m::*;
+   |         ^^^^
+   |
+note: the lint level is defined here
+  --> $DIR/overwrite-vis-unused.rs:3:9
+   |
+LL | #![deny(unused)]
+   |         ^^^^^^
+   = note: `#[deny(unused_imports)]` implied by `#[deny(unused)]`
+
+error: aborting due to 1 previous error
+