Radix 0.12.0

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Release notes#

Small but focused release completing Phase 0 of syntax modernization — converting every elige/discerne si arm across the parser, semantic analyzer, and codegen to case/default syntax — alongside new range-containment (intra) and set-membership (inter) operators.

Scale#

Major tracks#

Phase 0: Syntax Modernization#

The primary theme of this release. All remaining switch/match (if-armed) statements in the fons-fab/ self-hosted compiler sources are converted to case syntax (case replaces switch / discerne si, default replaces else as the default arm). Coverage spans 21 files and ~350 lines across:

• Parser — nucleus, errores, sententia/fluxus, sententia/varia (49fd9d05f)
• Semantic analysis — index, nucleus, typi (20+ type-equality checks), expressia/ (23 expression analyzers), sententia/ (22 statement analyzers) (49fd9d05f)
• Codegen — TS type annotation generation, expression generators, statement generators (49fd9d05f)
• Lexicon/lexor — keywords case, default, intra, inter, finge added; lexicon and lexor switched from if to case (3eb13091c)
• Original non-self-hosted `fons/` compiler — all switch/discerne si in parser, AST, tests, and exempla replaced with case/default (c217493fa)
• Discretio pattern-matching tests — updated to use case syntax (c9cf75add)
• Bootstrap plan — rewritten with phased approach and syntax-modernization priorities (5ea0b6430); historical content stripped, actionable info retained (7d6eb7721)

Verification: bun run faber compile fons-fab/cli.fab succeeds, proving the fons/ compiler can parse all fons-fab/ self-hosted source.

Annotation refactor#

Annotations changed from a modifiers[] interface to a single name + argument? form. Each @ line carries exactly one annotation; the parser validates that the name is on the same line as @. Codegen helpers check ann.name instead of ann.modifiers, and the Fab codegen emits one annotation per line. Design docs for endpoint routing (ad-annotatio.md) and set membership (si-inter.md) added alongside. (4e35f7aff)

intra / inter operators#

New binary operators at comparison precedence:

• `intra` — range containment: x intra 0..100 → (x >= 0 && x < 100)
• `inter` — set membership: x inter [1, 2] → [1, 2].includes(x)

Implemented across all six codegen targets (TypeScript, Python, Rust, C++, Zig, Fab) with semantic validation (intra requires a range, inter requires an array). Example files added for both operators. (4ebac0b16)

Follow-on work includes YAML test coverage with 5 test cases × all 6 targets (25 new tests) (8ec7bfff4), GRAMMAR.md and grammatica documentation updates (f07a876e8, b38a93c88), and promotion of design specs to completa/ (c4d45058f).

case / default design docs promoted to completa#

The casu-ceterum.md design document moved from consilia/futura/ to consilia/completa/, reflecting full implementation in c217493. (6e6dfadfe)

Other changes#

• AGENTS.md — Concise-ified and replaced with a symlink to CLAUDE.md (d9e925911)
• Planning docs — Updated GRAMMAR.md, grammatica/regimen.md, and added design docs for discernere-multi and casu-ceterum (3a9afe8f8)

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