How To Add A New Language Feature To OPA
summary
Adds string interpolation to Rego in OPA 1.12 and describes exactly what changed: scanner/parser gains two new tokens, the AST gets a template string node, the compiler lowers that node to a built‑in called template_string, and the topdown interpreter implements recursive evaluation with a single-value check and concatenation. Also covers the follow-up work: editor grammars, go‑to‑definition support, docs updates and lint rules to roll the feature across the OPA ecosystem.
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