Rollup merge of #90554 - ehuss:unstable-options-cleanup, r=joshtriplett

Clean up some `-Z unstable-options` in tests.

Several of these tests were for features that have been stabilized, or otherwise don't need `-Z unstable-options`.

Author: JohnTitor

src/test/ui/hello2021.rs

@@ -1,6 +1,5 @@
 // run-pass
 // edition:2021
-// compile-flags: -Zunstable-options
 
 fn main() {
     println!("hello, 2021");

src/test/ui/iterators/into-iter-on-arrays-2021.rs

@@ -1,6 +1,5 @@
 // check-pass
 // edition:2021
-// compile-flags: -Zunstable-options
 
 use std::array::IntoIter;
 use std::ops::Deref;

src/test/ui/lint/force-warn/allowed-cli-deny-by-default-lint.rs

@@ -1,6 +1,6 @@
 // --force-warn $LINT causes $LINT (which is deny-by-default) to warn
 // despite $LINT being allowed on command line
-// compile-flags: -A const_err --force-warn const_err -Zunstable-options
+// compile-flags: -A const_err --force-warn const_err
 // check-pass
 
 const C: i32 = 1 / 0;

src/test/ui/lint/force-warn/lint-group-allowed-cli-warn-by-default-lint.rs

@@ -1,6 +1,6 @@
 // --force-warn $LINT_GROUP causes $LINT (which is warn-by-default) to warn
 // despite $LINT being allowed on command line
-// compile-flags: -A bare-trait-objects --force-warn rust-2018-idioms -Zunstable-options
+// compile-flags: -A bare-trait-objects --force-warn rust-2018-idioms
 // check-pass
 
 pub trait SomeTrait {}

src/test/ui/lint/force-warn/warn-by-default-lint-two-modules.rs

@@ -1,6 +1,6 @@
 // --force-warn $LINT causes $LINT (which is warn-by-default) to warn
 // despite being allowed in one submodule (but not the other)
-// compile-flags: --force-warn dead_code -Zunstable-options
+// compile-flags: --force-warn dead_code
 // check-pass
 
 mod one {

src/test/ui/lint/force-warn/warnings-lint-group.rs

@@ -1,5 +1,5 @@
 // --force-warn warnings is an error
-// compile-flags: --force-warn warnings -Zunstable-options
+// compile-flags: --force-warn warnings
 // error-pattern: `warnings` lint group is not supported
 
 fn main() {}

src/test/ui/lint/force-warn/warnings-lint-group.stderr

@@ -2,8 +2,6 @@ error[E0602]: `warnings` lint group is not supported with ´--force-warn´
 
 error[E0602]: `warnings` lint group is not supported with ´--force-warn´
 
-error[E0602]: `warnings` lint group is not supported with ´--force-warn´
-
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0602`.

src/test/ui/lint/unused_parens_json_suggestion.fixed

@@ -1,4 +1,4 @@
-// compile-flags: --error-format json -Zunstable-options
+// compile-flags: --error-format json
 // run-rustfix
 
 // The output for humans should just highlight the whole span without showing

src/test/ui/lint/unused_parens_json_suggestion.rs

@@ -1,4 +1,4 @@
-// compile-flags: --error-format json -Zunstable-options
+// compile-flags: --error-format json
 // run-rustfix
 
 // The output for humans should just highlight the whole span without showing

src/test/ui/lint/unused_parens_json_suggestion.stderr

@@ -1,4 +1,4 @@
-{"message":"unnecessary parentheses around assigned value","code":{"code":"unused_parens","explanation":null},"level":"error","spans":[{"file_name":"$DIR/unused_parens_json_suggestion.rs","byte_start":596,"byte_end":597,"line_start":16,"line_end":16,"column_start":14,"column_end":15,"is_primary":true,"text":[{"text":"    let _a = (1 / (2 + 3));
+{"message":"unnecessary parentheses around assigned value","code":{"code":"unused_parens","explanation":null},"level":"error","spans":[{"file_name":"$DIR/unused_parens_json_suggestion.rs","byte_start":577,"byte_end":578,"line_start":16,"line_end":16,"column_start":14,"column_end":15,"is_primary":true,"text":[{"text":"    let _a = (1 / (2 + 3));
   --> $DIR/unused_parens_json_suggestion.rs:16:14
    |
 LL |     let _a = (1 / (2 + 3));