Auto merge of #6649 - pietroalbini:change-unfixable-warning, r=dwijnand

Switch from unused_imports to deprecated to test unfixable warnings

The `unused_imports` warning is going to emit fixable suggestions in the near future, but that means parts of the cargo's test suite will break. This commit switches the tests to use the `deprecated` warning, which *shouldn't* be fixable at all.

Author: bors

tests/testsuite/fix.rs

@@ -702,11 +702,11 @@ fn fix_features() {
 #[test]
 fn shows_warnings() {
     let p = project()
-        .file("src/lib.rs", "use std::default::Default; pub fn foo() {}")
+        .file("src/lib.rs", "#[deprecated] fn bar() {} pub fn foo() { let _ = bar(); }")
         .build();
 
     p.cargo("fix --allow-no-vcs")
-        .with_stderr_contains("[..]warning: unused import[..]")
+        .with_stderr_contains("[..]warning: use of deprecated item[..]")
         .run();
 }
 
@@ -982,20 +982,22 @@ fn shows_warnings_on_second_run_without_changes() {
         .file(
             "src/lib.rs",
             r#"
-                use std::default::Default;
+                #[deprecated]
+                fn bar() {}
 
                 pub fn foo() {
+                    let _ = bar();
                 }
             "#,
         )
         .build();
 
     p.cargo("fix --allow-no-vcs")
-        .with_stderr_contains("[..]warning: unused import[..]")
+        .with_stderr_contains("[..]warning: use of deprecated item[..]")
         .run();
 
     p.cargo("fix --allow-no-vcs")
-        .with_stderr_contains("[..]warning: unused import[..]")
+        .with_stderr_contains("[..]warning: use of deprecated item[..]")
         .run();
 }
 
@@ -1005,65 +1007,76 @@ fn shows_warnings_on_second_run_without_changes_on_multiple_targets() {
         .file(
             "src/lib.rs",
             r#"
-                use std::default::Default;
+                #[deprecated]
+                fn bar() {}
 
-                pub fn a() -> u32 { 3 }
+                pub fn foo() {
+                    let _ = bar();
+                }
             "#,
         )
         .file(
             "src/main.rs",
             r#"
-                use std::default::Default;
-                fn main() { println!("3"); }
+                #[deprecated]
+                fn bar() {}
+
+                fn main() {
+                    let _ = bar();
+                }
             "#,
         )
         .file(
             "tests/foo.rs",
             r#"
-                use std::default::Default;
+                #[deprecated]
+                fn bar() {}
+
                 #[test]
                 fn foo_test() {
-                    println!("3");
+                    let _ = bar();
                 }
             "#,
         )
         .file(
             "tests/bar.rs",
             r#"
-                use std::default::Default;
+                #[deprecated]
+                fn bar() {}
 
                 #[test]
                 fn foo_test() {
-                    println!("3");
+                    let _ = bar();
                 }
             "#,
         )
         .file(
             "examples/fooxample.rs",
             r#"
-                use std::default::Default;
+                #[deprecated]
+                fn bar() {}
 
                 fn main() {
-                    println!("3");
+                    let _ = bar();
                 }
             "#,
         )
         .build();
 
     p.cargo("fix --allow-no-vcs --all-targets")
-        .with_stderr_contains(" --> examples/fooxample.rs:2:21")
-        .with_stderr_contains(" --> src/lib.rs:2:21")
-        .with_stderr_contains(" --> src/main.rs:2:21")
-        .with_stderr_contains(" --> tests/bar.rs:2:21")
-        .with_stderr_contains(" --> tests/foo.rs:2:21")
+        .with_stderr_contains(" --> examples/fooxample.rs:6:29")
+        .with_stderr_contains(" --> src/lib.rs:6:29")
+        .with_stderr_contains(" --> src/main.rs:6:29")
+        .with_stderr_contains(" --> tests/bar.rs:7:29")
+        .with_stderr_contains(" --> tests/foo.rs:7:29")
         .run();
 
     p.cargo("fix --allow-no-vcs --all-targets")
-        .with_stderr_contains(" --> examples/fooxample.rs:2:21")
-        .with_stderr_contains(" --> src/lib.rs:2:21")
-        .with_stderr_contains(" --> src/main.rs:2:21")
-        .with_stderr_contains(" --> tests/bar.rs:2:21")
-        .with_stderr_contains(" --> tests/foo.rs:2:21")
+        .with_stderr_contains(" --> examples/fooxample.rs:6:29")
+        .with_stderr_contains(" --> src/lib.rs:6:29")
+        .with_stderr_contains(" --> src/main.rs:6:29")
+        .with_stderr_contains(" --> tests/bar.rs:7:29")
+        .with_stderr_contains(" --> tests/foo.rs:7:29")
         .run();
 }