Rollup merge of #57908 - petrochenkov:errepice, r=estebank

resolve: Fix span arithmetics in the import conflict error

https://github.com/rust-lang/rust/pull/56937 rebased and fixed

Fixes https://github.com/rust-lang/rust/issues/56411
Fixes https://github.com/rust-lang/rust/issues/57071
Fixes https://github.com/rust-lang/rust/issues/57787

r? @estebank

src/test/ui/issues/issue-56411.rs

@@ -0,0 +1,17 @@
+macro_rules! import {
+    ( $($name:ident),* ) => {
+        $(
+            mod $name;
+            pub use self::$name;
+            //~^ ERROR the name `issue_56411_aux` is defined multiple times
+            //~| ERROR `issue_56411_aux` is private, and cannot be re-exported
+
+        )*
+    }
+}
+
+import!(issue_56411_aux);
+
+fn main() {
+    println!("Hello, world!");
+}

src/test/ui/issues/issue-56411.stderr

@@ -0,0 +1,31 @@
+error[E0255]: the name `issue_56411_aux` is defined multiple times
+  --> $DIR/issue-56411.rs:5:21
+   |
+LL |             mod $name;
+   |             ---------- previous definition of the module `issue_56411_aux` here
+LL |             pub use self::$name;
+   |                     ^^^^^^^^^^^
+   |                     |
+   |                     `issue_56411_aux` reimported here
+   |                     you can use `as` to change the binding name of the import
+...
+LL | import!(issue_56411_aux);
+   | ------------------------- in this macro invocation
+   |
+   = note: `issue_56411_aux` must be defined only once in the type namespace of this module
+
+error[E0365]: `issue_56411_aux` is private, and cannot be re-exported
+  --> $DIR/issue-56411.rs:5:21
+   |
+LL |             pub use self::$name;
+   |                     ^^^^^^^^^^^ re-export of private `issue_56411_aux`
+...
+LL | import!(issue_56411_aux);
+   | ------------------------- in this macro invocation
+   |
+   = note: consider declaring type or module `issue_56411_aux` with `pub`
+
+error: aborting due to 2 previous errors
+
+Some errors occurred: E0255, E0365.
+For more information about an error, try `rustc --explain E0255`.

src/test/ui/issues/issue_56411_aux.rs

@@ -0,0 +1,5 @@
+// compile-pass
+
+struct T {}
+
+fn main() {}