Prohibit array changes by "a"/"*" specifier of `mrb_get_args()`

The "a"/"*" specifier of the `mrb_get_args()` function will now return `const mrb_value *`.
This is because it is difficult for the caller to check if it is an array object and write-barrier if necessary.
And it requires calling `mrb_ary_modify()` on the unmodified array object, which is also difficult (this is similar to #5087).

1 files changed, 4 insertions, 2 deletions

diff --git a/mrbgems/mruby-hash-ext/src/hash-ext.c b/mrbgems/mruby-hash-ext/src/hash-ext.c
index 75ebd412b..16e066c73 100644
--- a/mrbgems/mruby-hash-ext/src/hash-ext.c
+++ b/mrbgems/mruby-hash-ext/src/hash-ext.c
@@ -22,7 +22,8 @@
 static mrb_value
 hash_values_at(mrb_state *mrb, mrb_value hash)
 {
-  mrb_value *argv, result;
+  const mrb_value *argv;
+  mrb_value result;
   mrb_int argc, i;
   int ai;
 
@@ -49,7 +50,8 @@ hash_values_at(mrb_state *mrb, mrb_value hash)
 static mrb_value
 hash_slice(mrb_state *mrb, mrb_value hash)
 {
-  mrb_value *argv, result;
+  const mrb_value *argv;
+  mrb_value result;
   mrb_int argc, i;
 
   mrb_get_args(mrb, "*", &argv, &argc);