April 2026 monthly summary for scala/scala3: - Delivered performance and correctness improvements impacting local development and compiler toolchain. - Focused on tangible business value: faster local iteration, fewer verifier issues, and more reliable backend/codegen alignment. Key features delivered and bugs fixed: - Performance optimization: disabled Scaladoc generation for nonbootstrapped projects during local publishLocal, reducing build time from ~230s to ~90s, and aligning with existing practices in nonbootstrapped projects. Commit 5923f77420c19ccae2ef552aa36836015c6d4249. - Compiler compatibility fix: adopt vcBoxing in place of unboxedVCs to resolve a Scala 3 compiler conflict and stabilize main build. Commit 10a92555c94584bb8e0112312b7b899ab4cb1730. - Context-function erasure correctness: preserve erased flags on synthetic context-function parameters to fix verifier errors and ensure consistency between method type and erased tree. Commit d63493f44148432b2e6a01acea853564dbfd6c4f. - Implementation robustness: introduced a shared helper to propagate erasure/metadata to synthetic parameters, ensuring parameter-level flags (erased/given/implicit) are carried through to the generated code paths. This aligns symbol info with erased trees and improves backend consistency. Overall impact and accomplishments: - Substantial boost to local development productivity and build reliability, enabling faster iteration during bootstrapping and daily development. - Reduced risk of verifier errors and runtime mismatches in the Erasure/Backend phases, leading to smoother CI and release readiness. - Demonstrated strong problem solving across build tooling, compiler internals, and erasure semantics, reinforcing Scala 3 compiler stability. Technologies/skills demonstrated: - sbt-based build tuning and local publish flow optimization. - Scala 3 compiler internals: vc boxing/unboxing, erasure semantics, and synthetic parameter handling. - Type system robustness: context-function erasure consistency and symbol/tree alignment. - Debugging, refactoring, and metadata propagation for backend stability.