Tweak unnecessary import suggestion

Author: estebank

src/librustc_resolve/lib.rs

@@ -4932,7 +4932,7 @@ impl<'a> Resolver<'a> {
             Some((directive, _, true)) if should_remove_import && !directive.is_glob() => {
                 // Simple case - remove the entire import. Due to the above match arm, this can
                 // only be a single use so just remove it entirely.
-                err.span_suggestion(
+                err.span_suggestion_hidden(
                     directive.use_span_with_attributes,
                     "remove unnecessary import",
                     String::new(),

src/test/ui/double-type-import.stderr

@@ -4,12 +4,10 @@ error[E0252]: the name `X` is defined multiple times
 LL |     pub use self::bar::X;
    |             ------------ previous import of the type `X` here
 LL |     use self::bar::X;
-   |     ----^^^^^^^^^^^^-
-   |     |   |
-   |     |   `X` reimported here
-   |     help: remove unnecessary import
+   |         ^^^^^^^^^^^^ `X` reimported here
    |
    = note: `X` must be defined only once in the type namespace of this module
+   = help: remove unnecessary import
 
 error: aborting due to previous error
 

src/test/ui/imports/duplicate.stderr

@@ -4,12 +4,10 @@ error[E0252]: the name `foo` is defined multiple times
 LL |     use a::foo;
    |         ------ previous import of the value `foo` here
 LL |     use a::foo;
-   |     ----^^^^^^-
-   |     |   |
-   |     |   `foo` reimported here
-   |     help: remove unnecessary import
+   |         ^^^^^^ `foo` reimported here
    |
    = note: `foo` must be defined only once in the value namespace of this module
+   = help: remove unnecessary import
 
 error[E0659]: `foo` is ambiguous (glob import vs glob import in the same module)
   --> $DIR/duplicate.rs:46:15

src/test/ui/issues/issue-26886.stderr

@@ -4,12 +4,10 @@ error[E0252]: the name `Arc` is defined multiple times
 LL | use std::sync::{self, Arc};
    |                       --- previous import of the type `Arc` here
 LL | use std::sync::Arc;
-   | ----^^^^^^^^^^^^^^-
-   | |   |
-   | |   `Arc` reimported here
-   | help: remove unnecessary import
+   |     ^^^^^^^^^^^^^^ `Arc` reimported here
    |
    = note: `Arc` must be defined only once in the type namespace of this module
+   = help: remove unnecessary import
 
 error[E0252]: the name `sync` is defined multiple times
   --> $DIR/issue-26886.rs:4:5
@@ -18,12 +16,10 @@ LL | use std::sync::{self, Arc};
    |                 ---- previous import of the module `sync` here
 ...
 LL | use std::sync;
-   | ----^^^^^^^^^-
-   | |   |
-   | |   `sync` reimported here
-   | help: remove unnecessary import
+   |     ^^^^^^^^^ `sync` reimported here
    |
    = note: `sync` must be defined only once in the type namespace of this module
+   = help: remove unnecessary import
 
 error: aborting due to 2 previous errors
 

src/test/ui/issues/issue-52891.stderr

@@ -4,12 +4,10 @@ error[E0252]: the name `a` is defined multiple times
 LL | use issue_52891::a;
    |     -------------- previous import of the module `a` here
 LL | use issue_52891::a;
-   | ----^^^^^^^^^^^^^^-
-   | |   |
-   | |   `a` reimported here
-   | help: remove unnecessary import
+   |     ^^^^^^^^^^^^^^ `a` reimported here
    |
    = note: `a` must be defined only once in the type namespace of this module
+   = help: remove unnecessary import
 
 error[E0252]: the name `a` is defined multiple times
   --> $DIR/issue-52891.rs:14:19
@@ -129,15 +127,13 @@ error[E0252]: the name `n` is defined multiple times
   --> $DIR/issue-52891.rs:36:5
    |
 LL | use issue_52891::n;
-   | -------------------
-   | |   |
-   | |   previous import of the module `n` here
-   | help: remove unnecessary import
+   |     -------------- previous import of the module `n` here
 LL | #[macro_use]
 LL | use issue_52891::n;
    |     ^^^^^^^^^^^^^^ `n` reimported here
    |
    = note: `n` must be defined only once in the type namespace of this module
+   = help: remove unnecessary import
 
 error: aborting due to 10 previous errors
 

src/test/ui/proc-macro/shadow.stderr

@@ -1,16 +1,14 @@
 error[E0259]: the name `derive_a` is defined multiple times
   --> $DIR/shadow.rs:6:1
    |
-LL |   extern crate derive_a;
-   |   ---------------------- previous import of the extern crate `derive_a` here
-LL | / #[macro_use]
-LL | | extern crate derive_a;
-   | | ^^^^^^^^^^^^^^^^^^^^^-
-   | |_|____________________|
-   |   |                    help: remove unnecessary import
-   |   `derive_a` reimported here
+LL | extern crate derive_a;
+   | ---------------------- previous import of the extern crate `derive_a` here
+LL | #[macro_use]
+LL | extern crate derive_a;
+   | ^^^^^^^^^^^^^^^^^^^^^^ `derive_a` reimported here
    |
    = note: `derive_a` must be defined only once in the type namespace of this module
+   = help: remove unnecessary import
 
 error: aborting due to previous error
 

src/test/ui/resolve/resolve-conflict-import-vs-import.stderr

@@ -4,12 +4,10 @@ error[E0252]: the name `transmute` is defined multiple times
 LL | use std::mem::transmute;
    |     ------------------- previous import of the value `transmute` here
 LL | use std::mem::transmute;
-   | ----^^^^^^^^^^^^^^^^^^^-
-   | |   |
-   | |   `transmute` reimported here
-   | help: remove unnecessary import
+   |     ^^^^^^^^^^^^^^^^^^^ `transmute` reimported here
    |
    = note: `transmute` must be defined only once in the value namespace of this module
+   = help: remove unnecessary import
 
 error: aborting due to previous error
 

src/test/ui/unresolved/unresolved-extern-mod-suggestion.stderr

@@ -4,12 +4,10 @@ error[E0254]: the name `core` is defined multiple times
 LL | extern crate core;
    | ------------------ previous import of the extern crate `core` here
 LL | use core;
-   | ----^^^^-
-   | |   |
-   | |   `core` reimported here
-   | help: remove unnecessary import
+   |     ^^^^ `core` reimported here
    |
    = note: `core` must be defined only once in the type namespace of this module
+   = help: remove unnecessary import
 
 error: aborting due to previous error
 

src/test/ui/use/use-paths-as-items.stderr

@@ -4,12 +4,10 @@ error[E0252]: the name `mem` is defined multiple times
 LL | use std::{mem, ptr};
    |           --- previous import of the module `mem` here
 LL | use std::mem;
-   | ----^^^^^^^^-
-   | |   |
-   | |   `mem` reimported here
-   | help: remove unnecessary import
+   |     ^^^^^^^^ `mem` reimported here
    |
    = note: `mem` must be defined only once in the type namespace of this module
+   = help: remove unnecessary import
 
 error: aborting due to previous error