Add test cases for const Location

Author: lilasta

library/core/tests/lib.rs

@@ -7,6 +7,7 @@
 #![feature(const_assume)]
 #![feature(const_black_box)]
 #![feature(const_bool_to_option)]
+#![feature(const_caller_location)]
 #![feature(const_cell_into_inner)]
 #![feature(const_convert)]
 #![feature(const_heap)]
@@ -131,6 +132,7 @@ mod num;
 mod ops;
 mod option;
 mod pattern;
+mod panic;
 mod pin;
 mod pin_macro;
 mod ptr;

library/core/tests/panic.rs

@@ -0,0 +1 @@
+mod location;

library/core/tests/panic/location.rs

@@ -0,0 +1,31 @@
+use core::panic::Location;
+
+// Note: Some of the following tests depend on the source location,
+// so please be careful when editing this file.
+
+#[test]
+fn location_const_caller() {
+   const _CALLER_REFERENCE: &Location<'static> = Location::caller();
+   const _CALLER: Location<'static> = *Location::caller();
+}
+
+#[test]
+fn location_const_file() {
+   const CALLER: &Location<'static> = Location::caller();
+   const FILE: &str = CALLER.file();
+   assert_eq!(FILE, "library/core/tests/panic/location.rs");
+}
+
+#[test]
+fn location_const_line() {
+   const CALLER: &Location<'static> = Location::caller();
+   const LINE: u32 = CALLER.line();
+   assert_eq!(LINE, 21);
+}
+
+#[test]
+fn location_const_column() {
+   const CALLER: &Location<'static> = Location::caller();
+   const COLUMN: u32 = CALLER.column();
+   assert_eq!(COLUMN, 39);
+}