Improve error message for unrecognized instructions.

1 files changed, 1 insertions, 1 deletions

diff --git a/asm.myr b/asm.myr
index 250f242..2d2d172 100644
--- a/asm.myr
+++ b/asm.myr
@@ -129,7 +129,7 @@ const emitinstr = {p
             ;;
         ;;
     | _:
-        -> `std.Err("unrecognized instruction")
+        -> `std.Err(std.fmt("unrecognized instruction {}", p[0]))
     ;;
 
     -> `std.Ok((b, mark))