Introduce pattern matching [EXPERIMENTAL]

[ruby-core:87945] [Feature #14912]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67586 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/hash.c b/hash.c
index 36d5a86760..4841cbb198 100644
--- a/hash.c
+++ b/hash.c
@@ -4349,6 +4349,12 @@ rb_hash_to_proc(VALUE hash)
     return rb_func_proc_new(hash_proc_call, hash);
 }
 
+static VALUE
+rb_hash_deconstruct_keys(VALUE hash, VALUE keys)
+{
+    return hash;
+}
+
 static int
 add_new_i(st_data_t *key, st_data_t *val, st_data_t arg, int existing)
 {
@@ -6020,6 +6026,8 @@ Init_Hash(void)
     rb_define_method(rb_cHash, ">=", rb_hash_ge, 1);
     rb_define_method(rb_cHash, ">", rb_hash_gt, 1);
 
+    rb_define_method(rb_cHash, "deconstruct_keys", rb_hash_deconstruct_keys, 1);
+
     /* Document-class: ENV
      *
      * ENV is a hash-like accessor for environment variables.