use C style comments instead of C++ style comments

According to CONTRIBUTING.md,

Don't use C++ style comments

 /* This is the prefered comment style */

Use C++ style comments only for temporary comment e.g. commenting out some code lines.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/vm.c b/src/vm.c
index ffdd2e5dd..c113e67d7 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1320,7 +1320,7 @@ mrb_context_run(mrb_state *mrb, struct RProc *proc, mrb_value self, unsigned int
 
         switch (GETARG_B(i)) {
         case OP_R_RETURN:
-          // Fall through to OP_R_NORMAL otherwise
+          /* Fall through to OP_R_NORMAL otherwise */
           if (proc->env && !MRB_PROC_STRICT_P(proc)) {
             struct REnv *e = top_env(mrb, proc);