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ࢲୡ modernize package ʹ
ເΛݟΔ͔
feat. go/analysis, go/ast
Go Conference 2025 (2025/09/28)
Kaoru Muta / mentos
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ࣗݾհ
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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
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͏Θͬɾɾɾࢲୡͷ Go version
ݹ͗͢ɾɾɾʁ
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ͱࢥͬͨܦݧ͋Γ·͔͢ʁ
ձͷօ༷ͥͻڍखͰ✋
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ͥͻ version Λ͋͛·͠ΐ͏
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Go جຊతʹޙํޓੑ͕
όʔδϣϯؒͰ୲อ͞Ε͍ͯΔ
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͏Θͬɾɾɾࢲୡͷ Go ͷه๏
ݹ͗͢ɾɾɾʁ
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ͱࢥͬͨܦݧ͋Γ·͔͢ʁ
ձͷօ༷ͥͻڍखͰ✋
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࠷৽ͷه๏Λਵ࣌औΓೖΕΔͱ
ॻ͖ํ͕ࢄΒͬͯ͘Δͷ͕
एׯؾʹͳΔ (ํͳ͍)
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γϡοͱ౷ҰͰ͖ΕͱաڈʹເݟͨΓ
(ࠔͬͯͳ͍ΜͰ͚͢ͲͶ)
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ͦΜͳ࣌ʹ modernize package Λ͑
ເΛݟΕΔ͔͠Εͳ͍
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҆શʹ͔ͭதΛཧղ͠ͳ͕Β
͓͏ʂͱ͍͏ൃදͰ͢
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modernize package ͱ
● gopls ʹೖ͍ͬͯΔ (2025/9 ࣌Ͱ v0.2.0)
● go run ίϚϯυͰ࣮ߦͰ͖Δ
○ -fix Ͱɺ࠷৽ͷ Go ͰऔΓೖΕΒΕͨه๏Λద༻ͯ͘͠ΕΔ
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modernize package ͱ
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forvar (Go 1.22 ~) waitgroup (Go 1.25 ~)
ଞʹɺefaceany (interface{} → any) ͳͲɺෳͷέʔεʹରԠ
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†ࠇຐज़†Ͱɾɾɾʁ
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෦࣮ݟΔͧʂ
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ࠓճ forvar ͷ࣮Λ
Έ͍͖ͯ·͢
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લఏࣝ - go/ast
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Go ιʔείʔυͷநߏจ (AST) Λදݱ͢ΔͨΊͷύοέʔδ
#1. Node
AST ͷ֤ཁૉ (ex. จɾࣜɾม)
จͷ AST Node Λ Stmt interface Ͱѻ͏
#2. Token
ࣈ۟ͷ࠷খཁૉ (ex. ԋࢉࢠɾϦςϥϧ)
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લఏࣝ - go/analysis
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Go Ͱ੩తղੳΛ࣮͢ΔͨΊͷϑϨʔϜϫʔΫ
#1. Analyzer
ίʔυͷղੳΛߦ͏ղੳثͷ࣮ମ
#2. Pass
ύοέʔδͷղੳใΛ٧Ίͨͷ
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લఏࣝ - go/analysis
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Go Ͱ੩తղੳΛ࣮͢ΔͨΊͷϑϨʔϜϫʔΫ
#3. Diagnostic
Analyzer ͕ग़ྗ͢Δࢦఠࣄ߲
#4. SuggestedFix
Diagnostic ʹରͯ͠ͷमਖ਼Ҋ
(CLI Ͱ -fix option Ͱमਖ਼Λద༻Ͱ͖Δ)
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forvar - Analyzer ͷఆٛ
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forvar - Analyzer ͷఆٛ
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ղੳ͢Δ্Ͱ࣮ߦ͕ඞཁͳ
લॲཧͷAnalyzerͷఆٛ
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forvar - Analyzer ͷఆٛ
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࣮ࡍͷղੳॲཧΛهड़
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͍ͬͯΔ͜ͱ
#1. Go version ͷ࠷খཁ݅Λ֬ೝ
#2. for range Λ͍ͬͯΔՕॴͷݕग़
#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑
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͍ͬͯΔ͜ͱ
#1. Go version ͷ࠷খཁ݅Λ֬ೝ
#2. for range Λ͍ͬͯΔՕॴͷݕग़
#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑
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#1. Go version ͷ࠷খཁ݅Λ֬ೝ
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#1. Go version ͷ࠷খཁ݅Λ֬ೝ
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ࣗಈੜϑΝΠϧ͔Ͳ͏͔Λݕग़
ͦ͠͏ͩͬͨ߹ແࢹ͢Δ
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#1. Go version ͷ࠷খཁ݅Λ֬ೝ
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લॲཧͰ࣮ߦͨ͠inspect.Analyzer ͷ
ղੳ݁ՌΛड͚औΔ
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#1. Go version ͷ࠷খཁ݅Λ֬ೝ
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࠷খཁ͕݅ Go 1.22 ͷϑΝΠϧΛ
Ұ͍ͭͣͭࠪͯ͘͠
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#1. Go version ͷ࠷খཁ݅Λ֬ೝ
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ରͷϑΝΠϧʹଘࡏ͢Δ
for range จ ͷ stmt ΛҰͭͣͭࠪ
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͍ͬͯΔ͜ͱ
#1. Go version ͷ࠷খཁ݅Λ֬ೝ
#2. for range Λ͍ͬͯΔՕॴͷݕग़
#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑
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#2. for range Λ͍ͬͯΔՕॴͷݕग़
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ϊʔυ Λ for range จͱͯ͠ղऍ
ϧʔϓมΛએݴ͍ͯ͠Δͷ͕
ର (ex. `for k, v := range m`)
#2. for range Λ͍ͬͯΔՕॴͷݕग़
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#2. for range Λ͍ͬͯΔՕॴͷݕग़
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ϧʔϓͷதͰɺมΛಉ໊Ͱ
࠶એݴ͍ͯ͠Δ͔ͷఆΛߦ͏ؔ
(ex. k := k)
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#2. for range Λ͍ͬͯΔՕॴͷݕग़
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● ࠨ߲ͱӈ߲͕͍͠
● ϧʔϓมͱࠨ߲͕͍͠
߹Ҏ֎আ֎
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͍ͬͯΔ͜ͱ
#1. Go version ͷ࠷খཁ݅Λ֬ೝ
#2. for range Λ͍ͬͯΔՕॴͷݕग़
#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑
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#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑
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#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑
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for range ϧʔϓΛ1ߦͣͭࠪ
ͦͷ͏ͪɺ݅ʹҰகͨ͠ͷΛ
ॻ͖͑Δ
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#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑
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● ࣜϊʔυʹม
● ԋࢉࢠ͕ʮ:=ʯ
● ࠨ߲ͱӈ߲͕͍͠
● ϧʔϓมΛ࠶એݴ͍ͯ͠Δ
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#3. ݅ʹҰகͨ͠ՕॴΛॻ͖͑
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● Diagnostic ʹղੳ݁ՌΛηοτ
● SuggestedFix ʹɺ for range Ͱม࠶એ
ݴͷՕॴΛআ͢Δमਖ਼ҊΛηοτ
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͏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
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ເʹ͏ͭͭΛൈ͔͞ͳ͍
ఔʹͬͯΈΔͷ͕Αͦ͞͏
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ਖ਼͍͠มߋ͔֤ʑ͕
ݟۃΊ·͠ΐ͏
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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
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Thank You!
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