Issue #14459 has been updated by naruse (Yui NARUSE).

Backport changed from 2.3: DONTNEED, 2.4: DONTNEED, 2.5: REQUIRED to 2.3: DONTNEED, 2.4: DONTNEED, 2.5: DONE

ruby_2_5 r62527 merged revision(s) 62333.

----------------------------------------
Bug #14459: Unexpected compile error in 2.5.0
https://bugs.ruby-lang.org/issues/14459#change-70600

* Author: jnchito (Junichi Ito)
* Status: Closed
* 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: DONE
----------------------------------------
I created this script as test.rb.

~~~ ruby
h = { us: 'dollar', india: 'rupee' }
# 変数hのキーと値を**で展開させる
{ japan: 'yen', **h } #=> {:japan=>"yen", :us=>"dollar", :india=>"rupee"}

# **を付けない場合は構文エラーになる
# { japan: 'yen', h }
#=> SyntaxError: syntax error, unexpected '}', expecting =>
#   { japan: 'yen', h }
#                      ^

# ----------------------------------------

h = { us: 'dollar', india: 'rupee' }
{ japan: 'yen' }.merge(h) #=> {:japan=>"yen", :us=>"dollar", :india=>"rupee"}
~~~

In Ruby 2.4.3 it runs without errors, but in Ruby 2.5.0 it fails with compile error (SyntaxError).

~~~
  Desktop rbenv shell 2.4.3
  Desktop ruby -v
ruby 2.4.3p205 (2017-12-14 revision 61247) [x86_64-darwin17]
  Desktop ruby test.rb     
  Desktop rbenv shell 2.5.0
  Desktop ruby -v          
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
  Desktop ruby test.rb     
-- raw disasm--------
 <L508596008>
 trace: 1
 0000 putobject            :us                                         (   1)
 0002 putstring            "dollar"                                    (   1)
 0004 putobject            :india                                      (   1)
 0006 putstring            "rupee"                                     (   1)
 0008 newhash              4                                           (   1)
 0010 setlocal_OP__WC__0   3                                           (   1)
 trace: 1
*0012 newhash              2                                           (   3)
 0014 getlocal_OP__WC__0   3                                           (   3)
 0016 pop                                                              (   3)
 trace: 1
 0017 putobject            :us                                         (  13)
 0019 putstring            "dollar"                                    (  13)
 0021 putobject            :india                                      (  13)
 0023 putstring            "rupee"                                     (  13)
 0025 newhash              4                                           (  13)
 0027 setlocal_OP__WC__0   3                                           (  13)
 trace: 1
 0029 putobject            :japan                                      (  14)
 0031 putstring            "yen"                                       (  14)
 0033 newhash              2                                           (  14)
 0035 getlocal_OP__WC__0   3                                           (  14)
 0037 opt_send_without_block <callinfo:merge, 1>, <call cache>         (  14)
 0040 leave                                                            (  14)
---------------------
test.rb:3: argument stack underflow (-1)
Traceback (most recent call last):
test.rb: compile error (SyntaxError)
~~~

I attached actual test.rb. I think it should run without errors in Ruby 2.5.0 too.

---Files--------------------------------
test.rb (504 Bytes)


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