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when Foo, Bar creates a union Foo | Bar

kind:feature

status:discussion

topic:compiler:semantic

Status: Open.

#17045 In crystal-lang/crystal;

· straight-shoota opened on Jun 5, 2026

BUG: no target defs when a closure inside a case branch matching uninstantiated generic types is passed to OptionParser#on

kind:bugA bug in the code. Does not apply to documentation, specs, etc.A bug in the code. Does not apply to documentation, specs, etc.

topic:compiler:semantic

Status: Open.

Bug

#17044 In crystal-lang/crystal;

· naqvis opened on Jun 4, 2026

bin/crystal vs .build/crystal

status:discussion

topic:infrastructure

Status: Open.

#17041 In crystal-lang/crystal;

· straight-shoota opened on Jun 2, 2026

Formatter bug re: multiline calls with heredoc argument

kind:bugA bug in the code. Does not apply to documentation, specs, etc.A bug in the code. Does not apply to documentation, specs, etc.

topic:tools:formatter

Status: Open.

Bug

#17026 In crystal-lang/crystal;

· Sija opened on May 29, 2026

Type grammar self inside class Class refers to instance, not metaclass

kind:bugA bug in the code. Does not apply to documentation, specs, etc.A bug in the code. Does not apply to documentation, specs, etc.

status:discussion

topic:lang:type-system

Status: Open.

Bug

#17019 In crystal-lang/crystal;

· straight-shoota opened on May 28, 2026

Organize runtime initialization

status:discussion

topic:stdlib:runtime

Status: Open.

#17008 In crystal-lang/crystal;

· straight-shoota opened on May 26, 2026

Overload with type restriction does not take precedence for enum autocast

kind:bugA bug in the code. Does not apply to documentation, specs, etc.A bug in the code. Does not apply to documentation, specs, etc.

topic:compiler:semantic

Status: Open.

Bug

#16993 In crystal-lang/crystal;

· straight-shoota opened on May 21, 2026

Identifying closed stream errors

kind:feature

topic:stdlib:files

Status: Open.

Feature

#16976 In crystal-lang/crystal;

· straight-shoota opened on May 18, 2026

TIES_AWAY should be the default for Number#RoundingMode

kind:feature

Status: Open.

Feature

#16931 In crystal-lang/crystal;

· HCLarsen opened on May 9, 2026

lib declarations are dependent on code order

kind:bugA bug in the code. Does not apply to documentation, specs, etc.A bug in the code. Does not apply to documentation, specs, etc.

topic:compiler:parser

Status: Open.

Bug

#16918 In crystal-lang/crystal;

· LoadingBG opened on May 4, 2026

Macro #resolve on another def's parameter restriction picks up freevars from the wrong scope

kind:bugA bug in the code. Does not apply to documentation, specs, etc.A bug in the code. Does not apply to documentation, specs, etc.

topic:lang:macros

Status: Open.

Bug

#16913 In crystal-lang/crystal;

· Blacksmoke16 opened on May 2, 2026

Block type constraint in Sync::Mutex#synchronize confuses the compiler

kind:regressionSomething that used to correctly work but no longer worksSomething that used to correctly work but no longer works

topic:stdlib:runtime

Status: Open.

Bug

#16903 In crystal-lang/crystal;

· ysbaddaden opened on Apr 30, 2026