Some Hash destructive methods ensure the receiver modifiable [Bug #17736]

refs:

* https://bugs.ruby-lang.org/issues/17736
* https://github.com/ruby/ruby/pull/4296

This commit aims to cover following methods

* Hash#select!
* Hash#filter!
* Hash#keep_if
* Hash#reject!
* Hash#delete_if

I think these are not all.

---

* Ensure the receiver is modifiable or not
* Assert the receiver is not modified

1 files changed, 2 insertions, 0 deletions

diff --git a/hash.c b/hash.c
index e9a3ca96d3..8f51f467c2 100644
--- a/hash.c
+++ b/hash.c
@@ -2476,6 +2476,7 @@ static int
 delete_if_i(VALUE key, VALUE value, VALUE hash)
 {
     if (RTEST(rb_yield_values(2, key, value))) {
+	rb_hash_modify(hash);
 	return ST_DELETE;
     }
     return ST_CONTINUE;
@@ -2705,6 +2706,7 @@ static int
 keep_if_i(VALUE key, VALUE value, VALUE hash)
 {
     if (!RTEST(rb_yield_values(2, key, value))) {
+	rb_hash_modify(hash);
 	return ST_DELETE;
     }
     return ST_CONTINUE;