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Windows: ArgumentError: The node is already in a Pairing Heap treeandIOCP::Timer#wake_at cannot be nil under high UDP concurrency/timeout

#17058

· xiaojin2630 opened

on Jun 9, 2026

ICE: type_id fails for VirtualType in Proc with class variable

topic:compiler:codegen

#17051

· naqvis opened

on Jun 8, 2026

`when Foo, Bar` creates a union `Foo | Bar`

status:discussion

topic:compiler:semantic

#17045

· 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

topic:compiler:semantic

#17044

· naqvis opened

on Jun 4, 2026

`bin/crystal` vs `.build/crystal`

status:discussion

topic:infrastructure

#17041

· straight-shoota opened

on Jun 2, 2026

Formatter bug re: multiline calls with heredoc argument

topic:tools:formatter

#17026

· Sija opened

on May 29, 2026

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

status:discussion

topic:lang:type-system

#17019

· straight-shoota opened

on May 28, 2026

Organize runtime initialization

status:discussion

topic:stdlib:runtime

#17008

· straight-shoota opened

on May 26, 2026

Overload with type restriction does not take precedence for enum autocast

topic:compiler:semantic

#16993

· straight-shoota opened

on May 21, 2026

Identifying closed stream errors

topic:stdlib:files

#16976

· straight-shoota opened

on May 18, 2026

`TIES_AWAY` should be the default for `Number#RoundingMode`

#16931

· HCLarsen opened

on May 9, 2026

lib declarations are dependent on code order

topic:compiler:parser

#16918

· LoadingBG opened

on May 4, 2026