Read about the latest Haskell development and maintenance activity from Well-Typed in this report on work funded by Haskell Ecosystem Support Packages.

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Planet Haskell

Well-Typed's thirtieth Haskell ecosystem activities report covering December 2025 to February 2026. Key highlights include: a more robust Haskell Debugger (hdb) with stack traces, exception breakpoints, and Windows support; live program monitoring via eventlog-live with OpenTelemetry support; progress on decoupling Language.Haskell.Syntax from GHC internals (Trees That Grow); steps toward a standalone reinstallable base package; and a fix for a GHC absence analysis bug. GHC releases 9.12.3 and 9.14.1 shipped. HLS 2.13.0.0 was released with GHC 9.14 support and concurrent file loading. Notable team news: Matthew Pickering is leaving Well-Typed at end of March.

Haskell ecosystem activities report: December 2025–February 2026