Add FIXME comments to use test::ERROR_EXIT_CODE once public and fix typo

Author: GuillaumeGomez

src/librustdoc/doctest.rs

@@ -827,6 +827,7 @@ fn run_test(
     match result {
         Err(e) => return (duration, Err(TestFailure::ExecutionError(e))),
         Ok(out) => {
+            // FIXME: use test::ERROR_EXIT_CODE once public
             if langstr.should_panic && out.status.code() != Some(101) {
                 return (duration, Err(TestFailure::UnexpectedRunPass));
             } else if !langstr.should_panic && !out.status.success() {

src/librustdoc/doctest/runner.rs

@@ -143,6 +143,7 @@ mod __doctest_mod {{
             .output()
             .expect(\"failed to run command\");
         if should_panic {{
+            // FIXME: use test::ERROR_EXIT_CODE once public
             if out.status.code() != Some(101) {{
                 eprintln!(\"Test didn't panic, but it's marked `should_panic`.\");
                 ExitCode::FAILURE

tests/run-make/rustdoc-should-panic/rmake.rs

@@ -19,7 +19,7 @@ Test didn't panic, but it's marked `should_panic`.",
     for text in should_contain {
         assert!(
             output.contains(text),
-            "output doesn't contains (edition: {edition}) {:?}\nfull output: {output}",
+            "output (edition: {edition}) doesn't contain {:?}\nfull output: {output}",
             text
         );
     }