From 46fbd5349b1d31065cf3bba03913850726d538f7 Mon Sep 17 00:00:00 2001
From: Daniel Bovensiepen <daniel@bovensiepen.net>
Date: Fri, 12 Feb 2016 03:32:41 +0800
Subject: Add more limitations:   - defined?   - alias on global variables   -
 Operator modification   - Kernel.binding missing

---
 doc/limitations.md | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/doc/limitations.md b/doc/limitations.md
index d5d89cbc7..83bedc8fb 100644
--- a/doc/limitations.md
+++ b/doc/limitations.md
@@ -141,3 +141,68 @@ true
 true
 true
 ```
+
+## defined?
+
+The ```defined?``` keyword is considered to complex to be fully
+implemented. It is recommended to use ```const_defined?``` and
+other reflection methods instead.
+
+```ruby
+defined?(Foo)
+```
+
+#### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
+
+```
+nil
+```
+
+#### mruby [1.2.0 (2015-11-17)]
+
+```NameError``` is raised.
+
+## ```alias``` on global variables
+
+Aliasing a global variable works in CRuby but is not part
+of the ISO standard.
+
+```ruby
+alias $a $__a__
+```
+
+#### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
+
+```nil```
+
+#### mruby [1.2.0 (2015-11-17)]
+
+Syntax error
+
+## Operator modification
+
+An operator can't be overwritten by the user.
+
+```ruby
+class String
+  def +
+  end
+end
+
+'a' + 'b'
+```
+
+#### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
+
+```ArgumentError``` is raised.
+The re-defined ```+``` operator does not accept any arguments.
+
+#### mruby [1.2.0 (2015-11-17)]
+
+```'ab'```
+Behavior of the operator wasn't changed.
+
+## ```Kernel.binding``` missing
+
+```Kernel.binding``` is not implemented as it is not in the
+ISO standard.
-- 
cgit v1.2.3


From 299cb5a7b986ce0a38fe78edccbf7780acd3d267 Mon Sep 17 00:00:00 2001
From: Daniel Bovensiepen <daniel@bovensiepen.net>
Date: Fri, 12 Feb 2016 03:37:36 +0800
Subject: Fix formatting again...

---
 doc/limitations.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/limitations.md b/doc/limitations.md
index 83bedc8fb..4f2596a8c 100644
--- a/doc/limitations.md
+++ b/doc/limitations.md
@@ -173,7 +173,7 @@ alias $a $__a__
 
 #### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
 
-```nil```
+``` nil ```
 
 #### mruby [1.2.0 (2015-11-17)]
 
@@ -199,7 +199,7 @@ The re-defined ```+``` operator does not accept any arguments.
 
 #### mruby [1.2.0 (2015-11-17)]
 
-```'ab'```
+``` 'ab' ```
 Behavior of the operator wasn't changed.
 
 ## ```Kernel.binding``` missing
-- 
cgit v1.2.3