Lyric

What changed in v1.15.0 — 2026-08-19

The freeze prep: the design leftovers settled before the spec freezes semantics. opaque type arrives, the string API becomes methods, iterator chaining gets its documented No — and a latent function-id collision in the lowering falls. The bytecode format stays 3.2.

Fixed

• A function-id collision in the lowering, latent since struct-returning natives: the global initializer's slot was reserved only for DECLARED globals, but a struct-return buffer CREATES one during body lowering — and once a body also requested an extension method (the new string methods do), initializer and extension landed on the same id, and calls mis-spliced into the wrong function. The initializer draws from the shared id counter now, and the function list refuses id holes with a named internal error instead of a silent mis-splice.

Added

• Strings have methods: s.trim(), s.split(","), s.contains(x), s.length() — 26 methods via extend string in std.string. The free forms warn as deprecated and go with 2.0; concat and repeat stay free (they back + and *), and the type-directed families (fromXxx, parseXxx) keep their names. The methods come with any import of the module; a file needing no free name writes import std.string as strings; — and an import whose extensions are used no longer counts as unused. s.length() stays a call because it costs O(n), and every method returns a NEW string.

• opaque type: an alias with a new IDENTITY over the same layout — pub opaque type Entity = int;. Nothing converts implicitly in either direction; the explicit as to exactly the underlying and back is the one crossing; ==/!= compare within one alias; arithmetic, ordering, constraint satisfaction and f-string rendering are refused. At runtime the value IS its underlying (the cast costs nothing), and a native signature resolves the alias to the underlying — an SDK's handle crosses the host boundary as a plain number while scripts can neither forge one nor leak it. Neither opaque nor type is a keyword; both stay usable as identifiers.

The full changelog →