Ruby

I created this script as test.rb.

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.