sbt/zinc

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Scala incremental compiler library, used by sbt and other build tools

Stars: 352
Forks: 132
Open beginner issues: 0
Indexed issues: 58
Avg merge: 1d 6h
Merged PRs (30d): 27

Dominant language: Scala
License: Apache-2.0
Last GitHub push: Sep 19, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

Open All

58 open issues indexed

Changing `class A.x` recompiles code that uses `object A.x` Open

area/over_compilation

Difficulty 4/5 3-5 days Newbie friendliness 48/100

sbt/zinc#1796 · Opened Sep 14, 2026
Jars whose name ends in `rt.jar` are never tracked as library dependencies Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

sbt/zinc#1792 · Opened Sep 12, 2026
Latest versions of Zinc >=2.0.0-M16 cannot run on Java 11 Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

sbt/zinc#1696 · 1 comment · Opened May 14, 2026
[2.x] Compilers#toString causes sbt.internal.inc.InvalidScalaInstance: "Scala instance doesn't exist or is invalid" Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

sbt/zinc#1676 · 1 comment · Opened Apr 4, 2026
Failing incremental compilation, involving dependent type with type lambda bound Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sbt/zinc#1561 · 2 comments · Opened Jul 19, 2025
Incremental compilation issue when Java/Scala define the same class name, case-insensitive Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

sbt/zinc#1553 · 1 comment · Opened Jun 12, 2025
Stack overflow when writing analysis Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sbt/zinc#1529 · 2 comments · Opened Jan 17, 2025
Feature Request: Make Consistent Analysis Compression toggleable Open

feature good first issue

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sbt/zinc#1509 · 1 comment · Opened Dec 3, 2024
Zinc incremental compilation behaviour is different when executed in the single jvm vs two consecutive runs Open

sbt/zinc#1493 · 6 comments · 1 reaction · 1 assignee · Opened Nov 6, 2024
Do we need to set `-YdisableFlatCpCaching` for Scala 3? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

sbt/zinc#1480 · 1 comment · Opened Oct 21, 2024
Feature Request: Make zinc Scala 3 macro-aware Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

sbt/zinc#1478 · 3 comments · Opened Oct 21, 2024
Should `sbt.internal.inc.AnalyzingCompiler` be `Closeable`? Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

sbt/zinc#1465 · 1 reaction · Opened Oct 17, 2024
`JavaErrorParser` uses i18n dependent prefix Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

sbt/zinc#1464 · 1 comment · Opened Oct 17, 2024
[1.x] Port #1309 to scalac repo once new sbt version is released and used by scalac Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

sbt/zinc#1453 · Opened Oct 11, 2024
[2.x] Add tests for #1430 (content hash) Open

sbt/zinc#1441 · 1 comment · 1 assignee · Opened Oct 7, 2024
Pre-issue: is changing `nameHashes` on a trivial change normal? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

sbt/zinc#1427 · 1 comment · Opened Oct 4, 2024
A lot of code compiled on a small change (local variable name change) Open

area/over_compilation

Difficulty 5/5 Over a week Newbie friendliness 25/100

sbt/zinc#1396 · 37 comments · Opened Sep 16, 2024
ClosedFileSystemException caused by null in ZipFileSystem.ensureOpen in IntelliJ 2024.2 with Azul JDK for project and Temurin JDK for compile server Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

sbt/zinc#1383 · 19 comments · Opened Aug 13, 2024
Better documentation needed for `includeTransitiveInitialInvalidations` Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

sbt/zinc#1313 · 2 comments · Opened Dec 22, 2023
Clarification Suggested for `processExternalDependency` Method Name in Zinc Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

sbt/zinc#1307 · Opened Dec 10, 2023
compilation error with JVM 20 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

sbt/zinc#1204 · 6 comments · Opened Jun 13, 2023
Log4j formatting error Open

Difficulty 1/5 Under an hour Newbie friendliness 55/100

sbt/zinc#1122 · 2 comments · Opened Sep 14, 2022
rt.jar (class sbt.internal.inc.DummyVirtualFile) is not supported Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sbt/zinc#1102 · 1 comment · 1 reaction · Opened Jun 20, 2022
Timetable for dropping Scala 2.10 support Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

sbt/zinc#1078 · 2 comments · Opened Mar 17, 2022
The compiler interface should expose sourcePositionMappers so that Scala 3 can render messages with the proper positions Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

sbt/zinc#1074 · 2 comments · 2 reactions · Opened Mar 15, 2022
Unable to use custom doclet in sbt doc build Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

sbt/zinc#1023 · Opened Jan 20, 2022
Throw an error message when Scala 2.12.4 is used Open

sbt/zinc#1010 · 10 comments · 1 assignee · Opened Dec 12, 2021
Unexpected zinc cache invalidation after sbt remote cache hit Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

sbt/zinc#966 · 1 comment · Opened Mar 9, 2021
Zinc doesn't notice that `implicit` keyword has been removed from a method Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 30/100

sbt/zinc#945 · 1 comment · 1 reaction · Opened Nov 19, 2020
Feature request: Build and return `SourceInfos` when incremental compilation fails Open

sbt/zinc#932 · 11 comments · 1 assignee · Opened Oct 8, 2020
"Unable to locate class file for inner class" (mixed compilation bug?) Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 32/100

sbt/zinc#797 · 6 comments · Opened Jun 17, 2020
Dealias symlinks (via getCanonicalPath etc) somewhere Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

sbt/zinc#776 · Opened May 3, 2020
Could apiHash be computed as an unordered hash of the name hashes? Open

performance

Difficulty 5/5 Over a week Newbie friendliness 25/100

sbt/zinc#775 · 2 comments · Opened May 2, 2020
Underscore import does not report a valid Relation Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

sbt/zinc#745 · 1 comment · Opened Mar 5, 2020
Local Java invocation API migration Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

sbt/zinc#727 · Opened Jan 9, 2020
A package object with a monadSynax import is alway recompiled even when no file is changed Open

area/over_compilation

Difficulty 3/5 1-2 days Newbie friendliness 35/100

sbt/zinc#659 · 2 comments · Opened Apr 23, 2019
Extractor outputs are different in Scala 2.13.0-RC1 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sbt/zinc#653 · 9 comments · Opened Apr 10, 2019
[1.x] assertion failed: The <none> defined at <none> is not a class symbol Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sbt/zinc#645 · 12 comments · 1 reaction · Opened Mar 20, 2019
Support Scala bootstrapping Open

backlog enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sbt/zinc#636 · Opened Feb 1, 2019
Deprecate GenericMappers.mapMiniSetup Open

backlog

Difficulty 3/5 1-2 days Newbie friendliness 35/100

sbt/zinc#631 · 3 comments · Opened Jan 11, 2019
Keep track of java dependencies in JDK versions > 8 Open

area/jdk_x bug java support uncategorized

Difficulty 4/5 3-5 days Newbie friendliness 32/100

sbt/zinc#609 · 5 comments · Opened Oct 18, 2018
Changing abstract class to trait causes "invalid superClass" Open

area/under_compilation bug reproducibility severe

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sbt/zinc#598 · 3 comments · Opened Sep 18, 2018
LookupImpl.lookupAnalysis is O(N) wrt classpath length Open

performance uncategorized

Difficulty 5/5 Over a week Newbie friendliness 30/100

sbt/zinc#593 · 3 comments · Opened Sep 4, 2018
Investigate problem in java compilation in akka persistence module Open

bug uncategorized

Difficulty 4/5 3-5 days Newbie friendliness 15/100

sbt/zinc#586 · Opened Aug 27, 2018
Add a command-line interface? Open

community discussion feature uncategorized

Difficulty 5/5 Over a week Newbie friendliness 35/100

sbt/zinc#544 · 14 comments · 5 reactions · Opened May 21, 2018
Zinc doesn't like type aliases + type projections Open

bug discussion Scala Center uncategorized

sbt/zinc#535 · 11 comments · 1 assignee · Opened Apr 23, 2018
Refactor Zinc into a compiler plugin? Open

discussion uncategorized

Difficulty 5/5 Over a week Newbie friendliness 30/100

sbt/zinc#512 · 2 comments · 1 reaction · Opened Mar 18, 2018
Zinc undercompile in case of construct like A.type#B#C when type behind C changes Open

bug uncategorized

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sbt/zinc#476 · 1 comment · Opened Jan 6, 2018
Negative test (-compile, or expectation of compilation error) Open

build discussion enhancement uncategorized

Difficulty 4/5 3-5 days Newbie friendliness 38/100

sbt/zinc#432 · 3 comments · Opened Oct 13, 2017
Remove warnings of every Zinc module Open

enhancement good first issue help wanted uncategorized

Difficulty 4/5 3-5 days Newbie friendliness 30/100

sbt/zinc#349 · Opened Jul 8, 2017

sbt/zinc

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