--- a/rust/hg-core/src/exit_codes.rs	Wed Apr 27 15:47:57 2022 +0200
+++ b/rust/hg-core/src/exit_codes.rs	Tue Apr 19 12:27:40 2022 +0200
@@ -17,3 +17,6 @@
 
 /// Command or feature not implemented by rhg
 pub const UNIMPLEMENTED: ExitCode = 252;
+
+/// The fallback path is not valid
+pub const INVALID_FALLBACK: ExitCode = 253;