Move `Symbol#to_proc` to the core from `mruby-symbol-ext` gem.

Even though `Symbol#to_proc` is not included in ISO standard, the
`some_method(&:method_name)` is used very widely and convenient.
So we moved it to the core.

1 files changed, 7 insertions, 0 deletions

diff --git a/mrblib/symbol.rb b/mrblib/symbol.rb
new file mode 100644
index 000000000..9c981dd9e
--- /dev/null
+++ b/mrblib/symbol.rb
@@ -0,0 +1,7 @@
+class Symbol
+  def to_proc
+    ->(obj,*args,&block) do
+      obj.__send__(self, *args, &block)
+    end
+  end
+end