lang-items: Add Result and Try lang items

gcc/rust/ChangeLog:

	* util/rust-lang-item.h: Add handling for Result::Ok, Result::Err, Try, Try::into_result,
	Try::from_ok, Try::from_err.
	* util/rust-lang-item.cc: Likewise.

gcc/testsuite/ChangeLog:

	* rust/compile/try-trait.rs: New test.

1 files changed, 12 insertions, 0 deletions

diff --git a/gcc/rust/util/rust-lang-item.h b/gcc/rust/util/rust-lang-item.h
index 3b3d86e..4836536 100644
--- a/gcc/rust/util/rust-lang-item.h
+++ b/gcc/rust/util/rust-lang-item.h
@@ -127,8 +127,20 @@ public:
     OPTION_SOME,
     OPTION_NONE,
 
+    RESULT_OK,
+    RESULT_ERR,
+
     INTOITER_INTOITER,
     ITERATOR_NEXT,
+
+    // NOTE: These lang items are *not* necessarily present in later versions of
+    // Rust (I am unsure at which point they have been removed as the `Try`
+    // trait is unstable). They will need to be changed when updating the
+    // targeted Rust version of gccrs
+    TRY,
+    TRY_INTO_RESULT,
+    TRY_FROM_ERROR,
+    TRY_FROM_OK,
   };
 
   static const BiMap<std::string, Kind> lang_items;