d-programming-language-expert-skill

D programming language expert. Covers syntax, semantics, standard library (Phobos), compiler runtime (druntime), memory model, templates and metaprogramming, ranges and algorithms, concurrency and parallelism, tooling ecosystem, and language evolution. TRIGGER when: editing .d or .di files; working with dub.sdl or dub.json; code imports Phobos (std.*) or druntime (core.*) modules; questions about DMD/LDC compiler flags, DIPs, or D-specific idioms (ranges, UFCS, mixins, @safe/@nogc, scope guards). SKIP: non-D files that happen to use a .d extension (e.g. Makefile .d dependency files); other-language template engines; generic programming discussions not tied to actual D source.