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Issue #14897 has been updated by shyouhei (Shyouhei Urabe).
Backport changed from 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN to 2.3: DONTNEED, 2.4: DONTNEED, 2.5: REQUIRED
Seems `obj = obj` is (mistakenly) optimized out.
```
% ./miniruby --dump=i -v tmp.rb
ruby 2.6.0dev (2018-07-06 trunk 63854) [x86_64-darwin15]
== disasm: #<ISeq:<main>@tmp.rb:1 (1,0)-(10,16)> (catch: FALSE)
0000 putspecialobject 1 ( 1)[Li]
0002 putobject :seems_bug
0004 putiseq seems_bug
0006 opt_send_without_block <callinfo!mid:core#define_method, argc:2, ARGS_SIMPLE>, <callcache>
0009 pop
0010 putself ( 10)[Li]
0011 putstring "foo"
0013 opt_send_without_block <callinfo!mid:seems_bug, argc:1, FCALL|ARGS_SIMPLE>, <callcache>
0016 leave
== disasm: #<ISeq:seems_bug / tmp.rb:1 (1,0)-(8,3)> (catch: FALSE)
local table (size: 1, argc: 1 [opts: 0, rest: -1, post: 0, block: -1, kw: -1@-1, kwrest: -1])
[ 1] obj@0<Arg>
0000 getlocal_WC_0 obj@0 ( 2)[LiCa]
0002 branchif 8
0004 getlocal_WC_0 obj@0
0006 branchif 18
0008 putself ( 5)[Li]
0009 getlocal_WC_0 obj@0
0011 opt_send_without_block <callinfo!mid:inspect, argc:0, ARGS_SIMPLE>, <callcache>
0014 opt_send_without_block <callinfo!mid:raise, argc:1, FCALL|ARGS_SIMPLE>, <callcache>
0017 pop
0018 getlocal_WC_0 obj@0 ( 7)[Li]
0020 leave ( 8)[Re]
```
----------------------------------------
Bug #14897: Unexpected behavior of `if` in specific code
https://bugs.ruby-lang.org/issues/14897#change-72848
* Author: peitetsu (teppei takeo)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
* Backport: 2.3: DONTNEED, 2.4: DONTNEED, 2.5: REQUIRED
----------------------------------------
I found a strange behavior of `if` in the following code.
~~~ ruby
def seems_bug(obj)
if obj || obj
obj = obj
else
raise obj.inspect
end
obj
end
seems_bug('foo')
#=> RuntimeError: "foo"
~~~
This code is expected to return "foo", but the error on the else clause occurs.
The same error occurs in the following code.
~~~ ruby
def seems_bug(obj)
if obj || any1
any2 = any2
else
raise obj.inspect
end
obj
end
seems_bug('foo')
#=> RuntimeError: "foo"
~~~
--
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