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私達はmodernize packageに夢を見るか feat. go/analysis, g...
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m_t_tion1
September 28, 2025
Programming
2
640
私達はmodernize packageに夢を見るか feat. go/analysis, go/ast / Go Conference 2025
Go Conference 2025 Day2 での登壇資料です
https://gocon.jp/2025/talks/959035/
m_t_tion1
September 28, 2025
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Transcript
ࢲୡ modernize package ʹ ເΛݟΔ͔ feat. go/analysis, go/ast Go Conference
2025 (2025/09/28) Kaoru Muta / mentos
ࣗݾհ 2 Kaoru Muta ໂా ܆ (ϝϯτε) ੜ·ΕҭͪେࡕͰࠓେࡕʹ͍·͢ 🐯 גࣜձࣾBuySell
Technologies ͰόοΫΤϯυ୲ ϒϩϯζεϙϯαʔͱͯ͠ڠࢍͯ͠ΔΑʂ ങऔɾࠪఆ ങऔछผʹԠͨ͡࠷దͳγεςϜߏங Visit -๚ങऔ- Store -ళฮങऔ- ങऔ ϦϢʔεϓϥοτϑΥʔϜCosmos ࣗࣾ։ൃͷϦϢʔεಛԽۀجװγεςϜͰ͋ΓαʔϏε܈ͷू߹ମ @m_t_tion1
͏Θͬɾɾɾࢲୡͷ Go version ݹ͗͢ɾɾɾʁ 3 ͱࢥͬͨܦݧ͋Γ·͔͢ʁ ձͷօ༷ͥͻڍखͰ✋
ͥͻ version Λ͋͛·͠ΐ͏ 4 Go جຊతʹޙํޓੑ͕ όʔδϣϯؒͰ୲อ͞Ε͍ͯΔ
͏Θͬɾɾɾࢲୡͷ Go ͷه๏ ݹ͗͢ɾɾɾʁ 5 ͱࢥͬͨܦݧ͋Γ·͔͢ʁ ձͷօ༷ͥͻڍखͰ✋
࠷৽ͷه๏Λਵ࣌औΓೖΕΔͱ ॻ͖ํ͕ࢄΒͬͯ͘Δͷ͕ एׯؾʹͳΔ (ํͳ͍) 6 γϡοͱ౷ҰͰ͖ΕͱաڈʹເݟͨΓ (ࠔͬͯͳ͍ΜͰ͚͢ͲͶ)
ͦΜͳ࣌ʹ modernize package Λ͑ ເΛݟΕΔ͔͠Εͳ͍ 7 ҆શʹ͔ͭதΛཧղ͠ͳ͕Β ͓͏ʂͱ͍͏ൃදͰ͢
modernize package ͱ • gopls ʹೖ͍ͬͯΔ (2025/9 ࣌Ͱ v0.2.0) •
go run ίϚϯυͰ࣮ߦͰ͖Δ ◦ -fix Ͱɺ࠷৽ͷ Go ͰऔΓೖΕΒΕͨه๏Λద༻ͯ͘͠ΕΔ 8
modernize package ͱ 9 forvar (Go 1.22 ~) waitgroup (Go
1.25 ~) ଞʹɺefaceany (interface{} → any) ͳͲɺෳͷέʔεʹରԠ
†ࠇຐज़†Ͱɾɾɾʁ 10
෦࣮ݟΔͧʂ 11 ࠓճ forvar ͷ࣮Λ Έ͍͖ͯ·͢
લఏࣝ - go/ast 12 Go ιʔείʔυͷநߏจ (AST) Λදݱ͢ΔͨΊͷύοέʔδ #1. Node
AST ͷ֤ཁૉ (ex. จɾࣜɾม) จͷ AST Node Λ Stmt interface Ͱѻ͏ #2. Token ࣈ۟ͷ࠷খཁૉ (ex. ԋࢉࢠɾϦςϥϧ)
લఏࣝ - go/analysis 13 Go Ͱ੩తղੳΛ࣮͢ΔͨΊͷϑϨʔϜϫʔΫ #1. Analyzer ίʔυͷղੳΛߦ͏ղੳثͷ࣮ମ #2.
Pass ύοέʔδͷղੳใΛ٧Ίͨͷ
લఏࣝ - go/analysis 14 Go Ͱ੩తղੳΛ࣮͢ΔͨΊͷϑϨʔϜϫʔΫ #3. Diagnostic Analyzer ͕ग़ྗ͢Δࢦఠࣄ߲
#4. SuggestedFix Diagnostic ʹରͯ͠ͷमਖ਼Ҋ (CLI Ͱ -fix option Ͱमਖ਼Λద༻Ͱ͖Δ)
forvar - Analyzer ͷఆٛ 15
forvar - Analyzer ͷఆٛ 16 ղੳ͢Δ্Ͱ࣮ߦ͕ඞཁͳ લॲཧͷAnalyzerͷఆٛ
forvar - Analyzer ͷఆٛ 17 ࣮ࡍͷղੳॲཧΛهड़
18 ͍ͬͯΔ͜ͱ #1. Go version ͷ࠷খཁ݅Λ֬ೝ #2. for range Λ͍ͬͯΔՕॴͷݕग़
#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑
19 ͍ͬͯΔ͜ͱ #1. Go version ͷ࠷খཁ݅Λ֬ೝ #2. for range Λ͍ͬͯΔՕॴͷݕग़
#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑
#1. Go version ͷ࠷খཁ݅Λ֬ೝ 20
#1. Go version ͷ࠷খཁ݅Λ֬ೝ 21 ࣗಈੜϑΝΠϧ͔Ͳ͏͔Λݕग़ ͦ͠͏ͩͬͨ߹ແࢹ͢Δ
#1. Go version ͷ࠷খཁ݅Λ֬ೝ 22 લॲཧͰ࣮ߦͨ͠inspect.Analyzer ͷ ղੳ݁ՌΛड͚औΔ
#1. Go version ͷ࠷খཁ݅Λ֬ೝ 23 ࠷খཁ͕݅ Go 1.22 ͷϑΝΠϧΛ Ұ͍ͭͣͭࠪͯ͘͠
#1. Go version ͷ࠷খཁ݅Λ֬ೝ 24 ରͷϑΝΠϧʹଘࡏ͢Δ for range จ ͷ
stmt ΛҰͭͣͭࠪ
25 ͍ͬͯΔ͜ͱ #1. Go version ͷ࠷খཁ݅Λ֬ೝ #2. for range Λ͍ͬͯΔՕॴͷݕग़
#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑
#2. for range Λ͍ͬͯΔՕॴͷݕग़ 26
ϊʔυ Λ for range จͱͯ͠ղऍ ϧʔϓมΛએݴ͍ͯ͠Δͷ͕ ର (ex. `for k,
v := range m`) #2. for range Λ͍ͬͯΔՕॴͷݕग़ 27
#2. for range Λ͍ͬͯΔՕॴͷݕग़ 28 ϧʔϓͷதͰɺมΛಉ໊Ͱ ࠶એݴ͍ͯ͠Δ͔ͷఆΛߦ͏ؔ (ex. k :=
k)
#2. for range Λ͍ͬͯΔՕॴͷݕग़ 29 • ࠨ߲ͱӈ߲͕͍͠ • ϧʔϓมͱࠨ߲͕͍͠ ߹Ҏ֎আ֎
30 ͍ͬͯΔ͜ͱ #1. Go version ͷ࠷খཁ݅Λ֬ೝ #2. for range Λ͍ͬͯΔՕॴͷݕग़
#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑
#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑ 31
#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑ 32 for range ϧʔϓΛ1ߦͣͭࠪ ͦͷ͏ͪɺ݅ʹҰகͨ͠ͷΛ ॻ͖͑Δ
#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑ 33 • ࣜϊʔυʹม • ԋࢉࢠ͕ʮ:=ʯ • ࠨ߲ͱӈ߲͕͍͠ •
ϧʔϓมΛ࠶એݴ͍ͯ͠Δ
#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑ 34 • Diagnostic ʹղੳ݁ՌΛηοτ • SuggestedFix ʹɺ for
range Ͱม࠶એ ݴͷՕॴΛআ͢Δमਖ਼ҊΛηοτ
͏ʹ͋ͨͬͯͷݸਓͷҙݟ & ཹҙ͖͢ • modernize Թײߴ͘ɺ࠷৽ͷมߋʹैͯ͘͠Ε͍ͯΔ༷ࢠ ◦ waitgroup.Go ͕ Go
1.25 ʹ approve ͞Εͨ͜ͱΛड͚ͯ ଈ࠲ʹରԠ͍ͯ͠Δ: https://github.com/golang/go/issues/73059 • ੜAIʹίʔυΛॻ͔ͤΔ؍ ◦ ੲͷόʔδϣϯͰॻ͍ͯ͘Δ߹ʹରԠ͕ඞཁ͔ ◦ CI Ͱ modernize -test Λ࣮ߦͯ͠ɺࣦഊΛݩʹमਖ਼ͤ͞Δɾɾʁ • େલఏɺ͋͘·Ͱ beta Ͱ͋Γɺissue ͕͍͋ͬͯΔ ◦ https://github.com/golang/go/issues/75358 : ࣮ߦ࣌ʹ panic 35
ເʹ͏ͭͭΛൈ͔͞ͳ͍ ఔʹͬͯΈΔͷ͕Αͦ͞͏ 36 ਖ਼͍͠มߋ͔֤ʑ͕ ݟۃΊ·͠ΐ͏
ࢀߟจݙ • https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/ modernize • https://pkg.go.dev/golang.org/x/tools/go/analysis • https://pkg.go.dev/golang.org/x/tools/go/ast/inspector • https://zenn.dev/hsaki/books/golang-static-analysis
• https://zenn.dev/urakawa_jinsei/articles/3efa94ac6d16e7 37
Thank You! 38