After the v0.18.0 release of explcheck, the first issues discovered by the flow analysis are now being reported by the linter, such as E505 (Calling an undefined function). https://github.com/Witiko/expltools/releases/tag/2026-03-04

Performance of the flow analysis has been a constant challenge: some artificial code examples would take months to analyze. https://github.com/Witiko/expltools/issues/156 Version 0.18.1 brought a hard-won speedup of up to two orders of magnitude, reducing those months to mere hours, though there is still significant room for further optimization. https://github.com/Witiko/expltools/releases/tag/2026-03-10 This might make a good topic for a master's thesis.

The plan is still to have a v1.0.0 release ready for TUG 2026, but the flow analysis is far from finished and the project is now almost half a year behind the original schedule. Development is active and healthy, just the initial time expectations were wildly optimistic, making the TUG 2026 deadline increasingly uncertain.

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