[PRISM] Fix a -Wformat-zero-length warning

../prism_compile.c: In function ‘pm_compile_node’:
../prism_compile.c:2330:20: warning: zero-length gnu_printf format string [-Wformat-zero-length]
 2330 |             rb_bug("");
      |                    ^~

1 files changed, 1 insertions, 1 deletions

diff --git a/prism_compile.c b/prism_compile.c
index d744f43506..dcc0d38bd4 100644
--- a/prism_compile.c
+++ b/prism_compile.c
@@ -2327,7 +2327,7 @@ pm_compile_node(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const ret,
                 return;
             }
             COMPILE_ERROR(ERROR_ARGS "Invalid break");
-            rb_bug("");
+            rb_bug("Invalid break");
         }
         return;
       }