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

@@ -7,6 +7,8 @@
 
 //@ ignore-msvc
 
+use run_make_support::rustc;
+
 fn main() {
     rustc().input("depa.rs").run();
     rustc().input("depb.rs").run();
@@ -28,5 +30,5 @@ fn main() {
     let output = String::from_utf8(rustc().input("empty.rs").command_output().stderr).unwrap();
     assert!(!output.contains("-ltestb"));
     let output = String::from_utf8(rustc().input("empty.rs").command_output().stderr).unwrap();
-    assert_eq!(output.matches("-ltesta").count, 1);
+    assert_eq!(output.matches("-ltesta").count(), 1);
 }

tests/run-make/link-dedup/Makefile

@@ -0,0 +1,15 @@
+// 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
+
+use run_make_support::rustc;
+
+fn main() {
+    let output = String::from_utf8(rustc().output("").input("blank.rs").command_output().stderr)
+        .unwrap()
+        .to_lowercase();
+    assert!(!output.contains("panic"));
+}