Silence unused_import warning on unresolved import

[estebank]

use Foo::*; will cause the following output:

error[E0432]: unresolved import `Foo`
 --> src/lib.rs:1:5
  |
1 | use Foo::*;
  |     ^^^ use of undeclared type or module `Foo`

warning: unused import: `Foo::*`
 --> src/lib.rs:1:5
  |
1 | use Foo::*;
  |     ^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

The warning should be silenced.

CC #56982

[estebank]

The following doesn't seem to be behaving correctly either as only the first incorrect import gets an E0432, while the others just get the unused import warning:

use foo1;
use foo2::foo3;
use foo4::*;
use foo5;
use foo6::foo7;
use foo8::*;

I have a patch for the glob imports, but this new problem is still unresolved. CC @petrochenkov

--- a/src/librustc_resolve/resolve_imports.rs
+++ b/src/librustc_resolve/resolve_imports.rs
@@ -764,6 +764,12 @@ impl<'a, 'b> ImportResolver<'a, 'b> {
             match path_res {
                 PathResult::Module(module) => module,
                 PathResult::Indeterminate => return false,
+                PathResult::Failed { .. } if directive.is_glob() => {
+                    // Do not complain about unused import when encountering a bad glob import.
+                    // (#63724)
+                    self.r.used_imports.insert((directive.id, TypeNS));
+                    return true;
+                }
                 PathResult::NonModule(..) | PathResult::Failed { .. } => return true,
             }
         };

@petrochenkov what stops us from creating errors for both determined_imports and indeterminate_imports in finalize_imports? Other than the subpar suggestions like the following:

error[E0432]: unresolved import `foo5`
 --> file.rs:6:5
  |
6 | use foo5;
  |     ^^^^
  |     |
  |     no `foo5` in the root
  |     help: a similar name exists in the module: `foo7`