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No BuildFrom instance for concurrent.Map

has PR

library:collections

Status: Open.

#13047 In scala/bug;

· lrytz opened on Oct 18, 2024

Split up -sourcepath usage between scaladoc and -Y option for bootstrapping

help wanted

scaladoc tool

Status: Open.

#7125 In scala/bug;

· scabug opened on Feb 13, 2013

ClassCastException when calling a trait method with call-by-name argument if implemented as single abstract method

byname

fixed in Scala 3This issue does not exist in the Scala 3 compiler (https://github.com/lampepfl/dotty/)This issue does not exist in the Scala 3 compiler (https://github.com/lampepfl/dotty/)

has PR

sam

Status: Open.

#11237 In scala/bug;

· ruslan2009 opened on Nov 1, 2018

No completions returned in the middle of the select chain

help wanted

presentation compiler

Status: Open.

#12937 In scala/bug;

· kasiaMarek opened on Jan 26, 2024

Type inference involving <code>getClass</code> on private trait doesn't work

existential

fixed in Scala 3This issue does not exist in the Scala 3 compiler (https://github.com/lampepfl/dotty/)This issue does not exist in the Scala 3 compiler (https://github.com/lampepfl/dotty/)

help wanted

typer

Status: Open.

#12974 In scala/bug;

· palanga opened on Mar 25, 2024

<code>-Xsource-features:infer-override</code> stricter than Scala 3

Status: Open.

#12980 In scala/bug;

· lrytz opened on Apr 4, 2024

Compiler crash when importing coursierapi StringUtil

Status: Open.

#12998 In scala/bug;

· counter2015 opened on May 19, 2024

case value class <code>canEqual</code> is inconsistent

Status: Open.

#13034 In scala/bug;

· lrytz opened on Sep 12, 2024

<code>given</code> limitation under <code>-Xsource:3</code>

Status: Open.

#13040 In scala/bug;

· som-snytt opened on Sep 26, 2024

WARNING: java.lang.System::load has been called by org.jline.nativ.JLineNativeLoader in an unnamed module

jdk25

repl

Status: Open.

#13030 In scala/bug;

· xuwei-k opened on Sep 3, 2024

some Scala 2 REPL commands should be "deprecated" if not implemented in Scala 3

repl

Status: Open.

#13080 In scala/bug;

· SethTisue opened on Jan 22, 2025

Unsupported generic tuple error when using Scala 3 code in Scala 2

tastyreader

Status: Open.

#13124 In scala/bug;

· jadenPete opened on Sep 22, 2025

TASTy reader: Accessing opaque type with type param causes <code>NoSuchMethodError</code>

tastyreader

Status: Open.

#13072 In scala/bug;

· jilen opened on Dec 20, 2024

Certain type aliases written in Scala 3 can't be used in Scala 2

tastyreader

Status: Open.

#13113 In scala/bug;

· jadenPete opened on Aug 11, 2025

Certain concrete type projections written in Scala 3 can't be used in Scala 2

tastyreader

Status: Open.

#13114 In scala/bug;

· jadenPete opened on Aug 12, 2025

Subclasses of Scala 3 classes falsely flagged as missing implementations

tastyreader

Status: Open.

#13122 In scala/bug;

· jadenPete opened on Sep 19, 2025

Cross-version inheritance hierarchy crashes compiler

tastyreader

Status: Open.

#13125 In scala/bug;

· jadenPete opened on Oct 1, 2025

New warning with 2.13.17: a type was inferred to be kind-polymorphic <code>Nothing</code> to conform to <code>F[_]</code>

lint

Status: Open.

#13128 In scala/bug;

· durban opened on Oct 4, 2025