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Understanding Syntax Error on Ruby Blocks
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Tetsuya Kaneko
April 16, 2019
Programming
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Understanding Syntax Error on Ruby Blocks
Tetsuya Kaneko
April 16, 2019
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Transcript
Ruby Blocks ʹ͓͚Δ Syntax Error ͷṖΛ͏ 2019.4.16 ࣾLTେձ #1
@tetsuya
͜ͷίʔυಈ͘Ͱ͠ΐ͏͔ʁ 1.upto(2) {|i| p i }
ಈ͘ $ ruby -e '1.upto(2) {|i| p i } '
1 2
͡Ό͋ͬͪ͜ʁ 1.upto 2 {|i| p i }
͑
όʔδϣϯʹΑΔ
ྫ
Ruby 1.9.0-4 (ಈ͘) $ ruby -ve '1.upto 2 {|i| p
i} ' ruby 1.9.0 (2008-08-26 revision 18849) [i386-darwin18.2.0 ] 1 2
Ruby 2.3.3 (ಈ͔ͳ͍) $ ruby -ve '1.upto 2 {|i| p
i} ' ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin18 ] -e:1: syntax error, unexpected '{', expecting end-of-inpu t 1.upto 2 {|i| p i}
Ruby 2.4.0 (ಈ͘) $ ruby -ve '1.upto 2 {|i| p
i} ' ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin18 ] 1 2
Ruby 2.4.1 (ಈ͘) $ ruby -ve '1.upto 2 {|i| p
i} ' ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin18 ] 1 2
Ruby 2.4.2 (ಈ͔ͳ͍) $ ruby -ve '1.upto 2 {|i| p
i} ' ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin18 ] -e:1: syntax error, unexpected '{', expecting end-of-inpu t 1.upto 2 {|i| p i}
ͳ͔ͥ
ྺ࢙ΛḪΔ͜ͱ10 • ͱ1.9Ͱ༷มߋͱͯ͠Ճ͞ΕɺΑΓʹϒϩοΫΛղ ऍ͢ΔΑ͏ͳͷͩͬͨ • ʮϓϩάϥϚ a {|i| ...} ϝιουݺͼग़͠ͱͯ͠ղऍ͢Δ͕ɺ
2 {|i| …} ϝιουݺͼग़͠ͱղऍ͠ͳ͍ͣͩʯ • ʮϦςϥϧͰ͋Δ͔มͰ͋Δ͔ͰৼΔ͍͕ҟͳΔ͜ͱɺࠞ ཚΛট͘Մೳੑ͕͋Δʯ Bug #505: 1.upto 2 {|i| p i } - Ruby trunk - Ruby Issue Tracking System
ٞͷ * parse.y (yylex): "1.upto 2 {|i| p i }"
should be syntax error. · ruby/ruby@05edaf5
ͦͷޙಈ͍ͨΓಈ͔ͳ͔ͬͨΓ • Bug #13547: [].delete 1 { 'NG' } -
Ruby trunk - Ruby Issue Tracking System • Bug #14023: SyntaxError on array argument and block - Ruby trunk - Ruby Issue Tracking System
݁ • ɹɹɹɹɹɹɹɹɹ Syntax error ͕ͩɺRuby ͷόʔδϣϯ ʹΑͬͯಈ͍ͯ͠·͏ 1.upto 2
{|i| p i }