Rewrite and rename issue-26092 to rmake

Author: Oneirical

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -99,7 +99,6 @@ run-make/issue-20626/Makefile
 run-make/issue-22131/Makefile
 run-make/issue-25581/Makefile
 run-make/issue-26006/Makefile
-run-make/issue-26092/Makefile
 run-make/issue-28595/Makefile
 run-make/issue-33329/Makefile
 run-make/issue-35164/Makefile

tests/run-make/issue-26092/Makefile

@@ -0,0 +1,12 @@
+// When an empty output file is passed to rustc, the ensuing error message
+// should be clear. However, calling file_stem on an empty path returns None,
+// which, when unwrapped, causes a panic, stopping execution of rustc and printing an obscure message
+// instead of reaching the helpful error message. This test checks that the panic does not occur.
+// See https://github.com/rust-lang/rust/pull/26199
+
+fn main() {
+    let output = String::from_utf8(rustc().output("").input("blank.rs").command_output().stderr)
+        .unwrap()
+        .to_lowercase();
+    assert!(!output.contains("panic"));
+}