add core_macro.rs, sample.txt

single_file_tests/core_macro.rs

@@ -0,0 +1,9 @@
+
+fn main() {
+  println!("File: {}, line: {}, column: {}", file!(), line!(), column!());
+  println!("Module path: {}", module_path!());
+  println!("Stringify: {}", stringify!(1 + 1 * 2));
+  println!("include_str!(\"sample.txt\"): {}", include_str!("sample.txt"));
+  println!("include_bytes!(\"sample.txt\"): {:?}", include_bytes!("sample.txt"));
+}
+

single_file_tests/sample.txt

@@ -0,0 +1 @@
+sample txt