add test for no input file

Author: chenyukang

compiler/rustc_driver_impl/src/lib.rs

@@ -628,7 +628,10 @@ fn print_crate_info(
                 println!("{}", serde_json::to_string_pretty(&sess.target.to_json()).unwrap());
             }
             FileNames | CrateName => {
-                let Some(attrs) = attrs.as_ref() else { return Compilation::Continue; };
+                let Some(attrs) = attrs.as_ref() else {
+                    // no crate attributes, print out an error and exit
+                    return Compilation::Continue;
+                };
                 let t_outputs = rustc_interface::util::build_output_filenames(attrs, sess);
                 let id = rustc_session::output::find_crate_name(sess, attrs);
                 if *req == PrintRequest::CrateName {

tests/run-make/no-input-file/Makefile

@@ -0,0 +1,4 @@
+include ../../run-make-fulldeps/tools.mk
+
+all:
+	$(RUSTC) --print crate-name 2>&1 | diff - no-input-file.stderr

tests/run-make/no-input-file/no-input-file.stderr

@@ -0,0 +1,2 @@
+error: no input filename given
+