Add regression test for #143858

Author: GuillaumeGomez

tests/rustdoc-ui/doctest/no-run.edition2021.stdout

@@ -0,0 +1,12 @@
+
+running 7 tests
+test $DIR/no-run.rs - f (line 12) - compile ... ok
+test $DIR/no-run.rs - f (line 15) - compile ... ok
+test $DIR/no-run.rs - f (line 18) ... ignored
+test $DIR/no-run.rs - f (line 21) - compile ... ok
+test $DIR/no-run.rs - f (line 27) - compile fail ... ok
+test $DIR/no-run.rs - f (line 32) - compile ... ok
+test $DIR/no-run.rs - f (line 36) - compile ... ok
+
+test result: ok. 6 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in $TIME
+

tests/rustdoc-ui/doctest/no-run.edition2024.stdout

@@ -0,0 +1,17 @@
+
+running 5 tests
+test $DIR/no-run.rs - f (line 12) - compile ... ok
+test $DIR/no-run.rs - f (line 15) - compile ... ok
+test $DIR/no-run.rs - f (line 21) - compile ... ok
+test $DIR/no-run.rs - f (line 32) - compile ... ok
+test $DIR/no-run.rs - f (line 36) - compile ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in $TIME
+
+
+running 2 tests
+test $DIR/no-run.rs - f (line 18) ... ignored
+test $DIR/no-run.rs - f (line 27) - compile fail ... ok
+
+test result: ok. 1 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in $TIME
+

tests/rustdoc-ui/doctest/no-run.rs

@@ -0,0 +1,42 @@
+// This test ensures that the `--no-run` flag works the same between normal and merged doctests.
+// Regression test for <https://github.com/rust-lang/rust/issues/143858>.
+
+//@ check-pass
+//@ revisions: edition2021 edition2024
+//@ [edition2021]edition:2021
+//@ [edition2024]edition:2024
+//@ compile-flags:-Z unstable-options --test --no-run --test-args=--test-threads=1
+//@ normalize-stdout: "tests/rustdoc-ui/doctest" -> "$$DIR"
+//@ normalize-stdout: "finished in \d+\.\d+s" -> "finished in $$TIME"
+
+/// ```
+/// let a = true;
+/// ```
+/// ```should_panic
+/// panic!()
+/// ```
+/// ```ignore (incomplete-code)
+/// fn foo() {
+/// ```
+/// ```no_run
+/// loop {
+///     println!("Hello, world");
+/// }
+/// ```
+/// fails to compile
+/// ```compile_fail
+/// let x = 5;
+/// x += 2; // shouldn't compile!
+/// ```
+/// Ok the test does not run
+/// ```
+/// panic!()
+/// ```
+/// Ok the test does not run
+/// ```should_panic
+/// loop {
+///     println!("Hello, world");
+/// panic!()
+/// }
+/// ```
+pub fn f() {}